firestore

package module
v1.22.0 Latest Latest
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 Go to latest Published: Apr 15, 2026 License: Apache-2.0 Imports: 41 Imported by: 2,428

Documentation

Overview

Package firestore provides a client for reading and writing to a Cloud Firestore database.

See https://cloud.google.com/firestore/docs for an introduction to Cloud Firestore and additional help on using the Firestore API.

See https://godoc.org/cloud.google.com/go for authentication, timeouts, connection pooling and similar aspects of this package.

Note: you can't use both Cloud Firestore and Cloud Datastore in the same project.

Creating a Client

To start working with this package, create a client with a project ID: 

ctx := context.Background()
client, err := firestore.NewClient(ctx, "projectID")
if err != nil {
	// TODO: Handle error.
}

CollectionRefs and DocumentRefs

In Firestore, documents are sets of key-value pairs, and collections are groups of documents. A Firestore database consists of a hierarchy of alternating collections and documents, referred to by slash-separated paths like "States/California/Cities/SanFrancisco".

This client is built around references to collections and documents. CollectionRefs and DocumentRefs are lightweight values that refer to the corresponding database entities. Creating a ref does not involve any network traffic. 

states := client.Collection("States")
ny := states.Doc("NewYork")
// Or, in a single call:
ny = client.Doc("States/NewYork")

Reading

Use DocumentRef.Get to read a document. The result is a DocumentSnapshot. Call its Data method to obtain the entire document contents as a map. 

docsnap, err := ny.Get(ctx)
if err != nil {
	// TODO: Handle error.
}
dataMap := docsnap.Data()
fmt.Println(dataMap)

You can also obtain a single field with DataAt, or extract the data into a struct with DataTo. With the type definition 

type State struct {
	Capital    string  `firestore:"capital"`
	Population float64 `firestore:"pop"` // in millions
}

we can extract the document's data into a value of type State: 

var nyData State
if err := docsnap.DataTo(&nyData); err != nil {
	// TODO: Handle error.
}

Note that this client supports struct tags beginning with "firestore:" that work like the tags of the encoding/json package, letting you rename fields, ignore them, or omit their values when empty.

To retrieve multiple documents from their references in a single call, use Client.GetAll. 

docsnaps, err := client.GetAll(ctx, []*firestore.DocumentRef{
	states.Doc("Wisconsin"), states.Doc("Ohio"),
})
if err != nil {
	// TODO: Handle error.
}
for _, ds := range docsnaps {
	_ = ds // TODO: Use ds.
}

Writing

For writing individual documents, use the methods on DocumentReference. Create creates a new document. 

wr, err := ny.Create(ctx, State{
	Capital:    "Albany",
	Population: 19.8,
})
if err != nil {
	// TODO: Handle error.
}
fmt.Println(wr)

The first return value is a WriteResult, which contains the time at which the document was updated.

Create fails if the document exists. Another method, Set, either replaces an existing document or creates a new one. 

ca := states.Doc("California")
_, err = ca.Set(ctx, State{
	Capital:    "Sacramento",
	Population: 39.14,
})

To update some fields of an existing document, use Update. It takes a list of paths to update and their corresponding values. 

_, err = ca.Update(ctx, []firestore.Update{{Path: "capital", Value: "Sacramento"}})

Use DocumentRef.Delete to delete a document. 

_, err = ny.Delete(ctx)

Preconditions

You can condition Deletes or Updates on when a document was last changed. Specify these preconditions as an option to a Delete or Update method. The check and the write happen atomically with a single RPC. 

docsnap, err = ca.Get(ctx)
if err != nil {
	// TODO: Handle error.
}
_, err = ca.Update(ctx,
	[]firestore.Update{{Path: "capital", Value: "Sacramento"}},
	firestore.LastUpdateTime(docsnap.UpdateTime))

Here we update a doc only if it hasn't changed since we read it. You could also do this with a transaction.

To perform multiple writes at once, use a WriteBatch. Its methods chain for convenience.

WriteBatch.Commit sends the collected writes to the server, where they happen atomically. 

writeResults, err := client.Batch().
	Create(ny, State{Capital: "Albany"}).
	Update(ca, []firestore.Update{{Path: "capital", Value: "Sacramento"}}).
	Delete(client.Doc("States/WestDakota")).
	Commit(ctx)

Queries

You can use SQL to select documents from a collection. Begin with the collection, and build up a query using Select, Where and other methods of Query. 

q := states.Where("pop", ">", 10).OrderBy("pop", firestore.Desc)

Supported operators include '<', '<=', '>', '>=', '==', 'in', 'array-contains', and 'array-contains-any'.

Call the Query's Documents method to get an iterator, and use it like the other Google Cloud Client iterators. 

iter := q.Documents(ctx)
defer iter.Stop()
for {
	doc, err := iter.Next()
	if err == iterator.Done {
		break
	}
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(doc.Data())
}

To get all the documents in a collection, you can use the collection itself as a query. 

iter = client.Collection("States").Documents(ctx)

Firestore supports similarity search over embedding vectors. See Query.FindNearest for details.

Collection Group Partition Queries

You can partition the documents of a Collection Group allowing for smaller subqueries. 

collectionGroup = client.CollectionGroup("States")
partitions, err = collectionGroup.GetPartitionedQueries(ctx, 20)

You can also Serialize/Deserialize queries making it possible to run/stream the queries elsewhere; another process or machine for instance. 

queryProtos := make([][]byte, 0)
for _, query := range partitions {
	protoBytes, err := query.Serialize()
	// handle err
	queryProtos = append(queryProtos, protoBytes)
	...
}

for _, protoBytes := range queryProtos {
	query, err := client.CollectionGroup("").Deserialize(protoBytes)
	...
}

Transactions

Use a transaction to execute reads and writes atomically. All reads must happen before any writes. Transaction creation, commit, rollback and retry are handled for you by the Client.RunTransaction method; just provide a function and use the read and write methods of the Transaction passed to it. 

ny := client.Doc("States/NewYork")
err := client.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
	doc, err := tx.Get(ny) // tx.Get, NOT ny.Get!
	if err != nil {
		return err
	}
	pop, err := doc.DataAt("pop")
	if err != nil {
		return err
	}
	return tx.Update(ny, []firestore.Update{{Path: "pop", Value: pop.(float64) + 0.2}})
})
if err != nil {
	// TODO: Handle error.
}

Google Cloud Firestore Emulator

This package supports the Cloud Firestore emulator, which is useful for testing and development. Environment variables are used to indicate that Firestore traffic should be directed to the emulator instead of the production Firestore service.

To install and run the emulator and its environment variables, see the documentation at https://cloud.google.com/sdk/gcloud/reference/beta/emulators/firestore/. Once the emulator is running, set FIRESTORE_EMULATOR_HOST to the API endpoint. 

// Set FIRESTORE_EMULATOR_HOST environment variable.
err := os.Setenv("FIRESTORE_EMULATOR_HOST", "localhost:9000")
if err != nil {
	// TODO: Handle error.
}
// Create client as usual.
client, err := firestore.NewClient(ctx, "my-project-id")
if err != nil {
	// TODO: Handle error.
}
defer client.Close()

Index

Examples

Constants

View Source 
const (
	// Delete is used as a value in a call to Update or Set with merge to indicate
	// that the corresponding key should be deleted.
	Delete sentinel = iota

	// ServerTimestamp is used as a value in a call to Update to indicate that the
	// key's value should be set to the time at which the server processed
	// the request.
	//
	// ServerTimestamp must be the value of a field directly; it cannot appear in
	// array or struct values, or in any value that is itself inside an array or
	// struct.
	ServerTimestamp
)
View Source 
const DefaultDatabaseID = "(default)"

DefaultDatabaseID is name of the default database

View Source 
const DefaultTransactionMaxAttempts = 5

DefaultTransactionMaxAttempts is the default number of times to attempt a transaction.

View Source 
const DetectProjectID = detect.ProjectIDSentinel

DetectProjectID is a sentinel value that instructs NewClient to detect the project ID. It is given in place of the projectID argument. NewClient will use the project ID from the given credentials or the default credentials (https://developers.google.com/accounts/docs/application-default-credentials) if no credentials were provided. When providing credentials, not all options will allow NewClient to extract the project ID. Specifically a JWT does not have the project ID encoded.

View Source 
const DocumentID = "__name__"

DocumentID is the special field name representing the ID of a document in queries.

Variables

View Source 
var (
	// ErrPipelineWithoutDatabase is returned when a pipeline is executed without a database such as a subcollection pipeline.
	ErrPipelineWithoutDatabase = errors.New("firestore: pipeline without a database cannot be executed directly, only as part of another pipeline")
	// ErrRelativeScopeUnionUnsupported is returned when a union is used with a relative scope pipeline.
	ErrRelativeScopeUnionUnsupported = errors.New("firestore: union only supports combining root pipelines; relative scope pipelines (like subcollection pipelines) are not supported")
)
View Source 
var LogWatchStreams = false

LogWatchStreams controls whether watch stream status changes are logged. This feature is EXPERIMENTAL and may disappear at any time.

View Source 
var ReadOnly = ro{}

ReadOnly is a TransactionOption that makes the transaction read-only. Read-only transactions cannot issue write operations, but are more efficient.

Functions

func ArrayRemove 

func ArrayRemove(elems ...interface{}) arrayRemove

ArrayRemove specifies elements to be removed from whatever array already exists in the server.

If a value exists and it's an array, values are removed from it. All duplicate values are removed. If a value exists and it's not an array, the value is replaced by an empty array. If a value does not exist, an empty array is created.

ArrayRemove must be the value of a field directly; it cannot appear in array or struct values, or in any value that is itself inside an array or struct.

Example (Update) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	co := client.Doc("States/Colorado")
	wr, err := co.Update(ctx, []firestore.Update{
		{Path: "cities", Value: firestore.ArrayRemove("Denver")},
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}

func ArrayUnion 

func ArrayUnion(elems ...interface{}) arrayUnion

ArrayUnion specifies elements to be added to whatever array already exists in the server, or to create an array if no value exists.

If a value exists and it's an array, values are appended to it. Any duplicate value is ignored. If a value exists and it's not an array, the value is replaced by an array of the values in the ArrayUnion. If a value does not exist, an array of the values in the ArrayUnion is created.

ArrayUnion must be the value of a field directly; it cannot appear in array or struct values, or in any value that is itself inside an array or struct.

Example (Create) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	wr, err := client.Doc("States/Colorado").Create(ctx, map[string]interface{}{
		"cities": firestore.ArrayUnion("Denver", "Golden", "Boulder"),
		"pop":    5.5,
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}
Example (Update) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	co := client.Doc("States/Colorado")
	wr, err := co.Update(ctx, []firestore.Update{
		{Path: "cities", Value: firestore.ArrayUnion("Broomfield")},
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}

func FieldTransformIncrement added in v1.3.0 

func FieldTransformIncrement(n interface{}) transform

FieldTransformIncrement returns a special value that can be used with Set, Create, or Update that tells the server to transform the field's current value by the given value.

The supported values are: 

int, int8, int16, int32, int64
uint8, uint16, uint32
float32, float64

If the field does not yet exist, the transformation will set the field to the given value.

func FieldTransformMaximum added in v1.3.0 

func FieldTransformMaximum(n interface{}) transform

FieldTransformMaximum returns a special value that can be used with Set, Create, or Update that tells the server to set the field to the maximum of the field's current value and the given value.

The supported values are: 

int, int8, int16, int32, int64
uint8, uint16, uint32
float32, float64

If the field is not an integer or double, or if the field does not yet exist, the transformation will set the field to the given value. If a maximum operation is applied where the field and the input value are of mixed types (that is - one is an integer and one is a double) the field takes on the type of the larger operand. If the operands are equivalent (e.g. 3 and 3.0), the field does not change. 0, 0.0, and -0.0 are all zero. The maximum of a zero stored value and zero input value is always the stored value. The maximum of any numeric value x and NaN is NaN.

func FieldTransformMinimum added in v1.3.0 

func FieldTransformMinimum(n interface{}) transform

FieldTransformMinimum returns a special value that can be used with Set, Create, or Update that tells the server to set the field to the minimum of the field's current value and the given value.

The supported values are: 

int, int8, int16, int32, int64
uint8, uint16, uint32
float32, float64

If the field is not an integer or double, or if the field does not yet exist, the transformation will set the field to the given value. If a minimum operation is applied where the field and the input value are of mixed types (that is - one is an integer and one is a double) the field takes on the type of the smaller operand. If the operands are equivalent (e.g. 3 and 3.0), the field does not change. 0, 0.0, and -0.0 are all zero. The minimum of a zero stored value and zero input value is always the stored value. The minimum of any numeric value x and NaN is NaN.

func Fields added in v1.22.0 

func Fields(f ...any) []any

Fields is a helper function that returns its arguments as a slice of any. It is used to provide variadic-like ergonomics for pipeline stages that accept a slice of fields or expressions.

func Increment 

func Increment(n interface{}) transform

Increment is an alias for FieldTransformIncrement.

Example (Create) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	wr, err := client.Doc("States/Colorado").Create(ctx, map[string]interface{}{
		"cities": []string{"Denver", "Golden", "Boulder"},
		"pop":    firestore.Increment(7), // "pop" will be set to 7.
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}
Example (Update) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	co := client.Doc("States/Colorado")
	wr, err := co.Update(ctx, []firestore.Update{
		{Path: "pop", Value: firestore.Increment(7)}, // "pop" will incremented by 7.
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}

func MaxAttempts 

func MaxAttempts(n int) maxAttempts

MaxAttempts is a TransactionOption that configures the maximum number of times to try a transaction. In defaults to DefaultTransactionMaxAttempts.

func Ptr added in v1.17.0 

func Ptr[T any](t T) *T

Ptr returns a pointer to its argument. It can be used to initialize pointer fields: 

findNearestOptions.DistanceThreshold = firestore.Ptr[float64](0.1)

func WithCommitResponseTo added in v1.18.0 

func WithCommitResponseTo(r *CommitResponse) commitResponse

WithCommitResponseTo returns a TransactionOption that specifies where the CommitResponse should be written on successful commit. Nothing is written on a failed commit.

Types

type AddFieldsOption added in v1.22.0 

type AddFieldsOption interface {
	StageOption
	// contains filtered or unexported methods
}

AddFieldsOption is an option for an AddFields pipeline stage.

type AggregateFunction added in v1.21.0 

type AggregateFunction interface {
	As(alias string) *AliasedAggregate
	// contains filtered or unexported methods
}

AggregateFunction represents an aggregation function in a pipeline.

func ArrayAgg added in v1.22.0 

func ArrayAgg(fieldOrExpr any) AggregateFunction

ArrayAgg returns an array containing all values of the expression when evaluated on each document in the group. If the expression resolves to an absent value, it is converted to NULL. The order of elements in the output array is not stable and shouldn't be relied upon.

func ArrayAggDistinct added in v1.22.0 

func ArrayAggDistinct(fieldOrExpr any) AggregateFunction

ArrayAggDistinct returns an array containing all distinct values of the expression when evaluated on each document in the group. If the expression resolves to an absent value, it is converted to NULL. The order of elements in the output array is not stable and shouldn't be relied upon.

func Average added in v1.21.0 

func Average(fieldOrExpr any) AggregateFunction

Average creates an aggregation that calculates the average (mean) of values from an expression or a field's values across multiple stage inputs. fieldOrExpr can be a field path string, FieldPath or Expression Example: 

	// Calculate the average age of users
	Average(FieldOf("info.age")).As("averageAge")       // FieldOf returns Expr
	Average(FieldOfPath("info.age")).As("averageAge") // FieldOfPath returns Expr
    Average("info.age").As("averageAge")              // String implicitly becomes FieldOf(...).As(...)
    Average(FieldPath([]string{"info", "age"})).As("averageAge")

func Count added in v1.21.0 

func Count(fieldOrExpr any) AggregateFunction

Count creates an aggregation that counts the number of stage inputs with valid evaluations of the provided field or expression. fieldOrExpr can be a field path string, FieldPath or Expression Example: 

	// Count the number of items where the price is greater than 10
	Count(FieldOf("price").Gt(10)).As("expensiveItemCount") // FieldOf("price").Gt(10) is a BooleanExpr
    // Count the total number of products
	Count("productId").As("totalProducts")                  // String implicitly becomes FieldOf(...).As(...)

func CountAll added in v1.21.0 

func CountAll() AggregateFunction

CountAll creates an aggregation that counts the total number of stage inputs.

Example: 

	// Count the total number of users
    CountAll().As("totalUsers")

func CountDistinct added in v1.21.0 

func CountDistinct(fieldOrExpr any) AggregateFunction

CountDistinct creates an aggregation that counts the number of distinct values of the provided field or expression. fieldOrExpr can be a field path string, FieldPath or Expression Example: 

	// CountDistinct the number of distinct items where the price is greater than 10
	CountDistinct(FieldOf("price").Gt(10)).As("expensiveItemCount") // FieldOf("price").Gt(10) is a BooleanExpr
    // CountDistinct the total number of distinct products
	CountDistinct("productId").As("totalProducts")                  // String implicitly becomes FieldOf(...).As(...)

func CountIf added in v1.21.0 

func CountIf(condition BooleanExpression) AggregateFunction

CountIf creates an aggregation that counts the number of stage inputs where the provided boolean expression evaluates to true. Example: 

CountIf(FieldOf("published").Equal(true)).As("publishedCount")

func First added in v1.22.0 

func First(fieldOrExpr any) AggregateFunction

First returns the value of the expression for the first document in the group.

func Last added in v1.22.0 

func Last(fieldOrExpr any) AggregateFunction

Last returns the value of the expression for the last document in the group.

func Maximum added in v1.21.0 

func Maximum(fieldOrExpr any) AggregateFunction

Maximum creates an aggregation that calculates the maximum of values from an expression or a field's values across multiple stage inputs.

Example: 

	// Find the highest order amount
	Maximum(FieldOf("orderAmount")).As("maxOrderAmount") // FieldOf returns Expr
 	Maximum("orderAmount").As("maxOrderAmount")          // String implicitly becomes FieldOf(...).As(...)

func Minimum added in v1.21.0 

func Minimum(fieldOrExpr any) AggregateFunction

Minimum creates an aggregation that calculates the minimum of values from an expression or a field's values across multiple stage inputs.

Example: 

	// Find the lowest order amount
	Minimum(FieldOf("orderAmount")).As("minOrderAmount") // FieldOf returns Expr
 	Minimum("orderAmount").As("minOrderAmount")          // String implicitly becomes FieldOf(...).As(...)

func RawAggregate added in v1.22.0 

func RawAggregate(name string, fieldOrExprs ...any) AggregateFunction

RawAggregate creates a raw aggregation function.

This method provides a way to call aggregation functions that are supported by the Firestore backend but that are not available as specific factory methods in this class.

Example: 

RawAggregate("sum", "orderAmount").As("totalRevenue")

func Sum added in v1.21.0 

func Sum(fieldOrExpr any) AggregateFunction

Sum creates an aggregation that calculates the sum of values from an expression or a field's values across multiple stage inputs.

Example: 

	// Calculate the total revenue from a set of orders
	Sum(FieldOf("orderAmount")).As("totalRevenue") // FieldOf returns Expr
 	Sum("orderAmount").As("totalRevenue")          // String implicitly becomes FieldOf(...).As(...)

type AggregateOption added in v1.22.0 

type AggregateOption interface {
	StageOption
	// contains filtered or unexported methods
}

AggregateOption is an option for executing a pipeline aggregation stage.

func WithAggregateGroups added in v1.22.0 

func WithAggregateGroups(groups ...any) AggregateOption

WithAggregateGroups specifies the fields or expressions to group the documents by. Each of the grouping keys can be a string field path, a FieldPath, or a Selectable expression.

type AggregationQuery added in v1.8.0 

type AggregationQuery struct {
	// contains filtered or unexported fields
}

AggregationQuery allows for generating aggregation results of an underlying basic query. A single AggregationQuery can contain multiple aggregations.

func (*AggregationQuery) Get added in v1.8.0 

func (a *AggregationQuery) Get(ctx context.Context) (AggregationResult, error)

Get retrieves the aggregation query results from the service.

func (*AggregationQuery) GetResponse added in v1.17.0 

func (a *AggregationQuery) GetResponse(ctx context.Context) (aro *AggregationResponse, err error)

GetResponse runs the aggregation with the options provided in the query

func (*AggregationQuery) Pipeline added in v1.21.0 

func (aq *AggregationQuery) Pipeline() *Pipeline

Pipeline creates a new Pipeline from the aggregation query. All of the operations of the underlying query will be converted to pipeline stages, and an aggregate stage will be added for the aggregations.

func (*AggregationQuery) Transaction added in v1.14.0 

func (a *AggregationQuery) Transaction(tx *Transaction) *AggregationQuery

Transaction specifies that aggregation query should run within provided transaction

func (*AggregationQuery) WithAvg added in v1.14.0 

func (a *AggregationQuery) WithAvg(path string, alias string) *AggregationQuery

WithAvg specifies that the aggregation query should provide an average of the values of the provided field in the results returned by the underlying Query. The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the average value. If alias is empty, Firestore will autogenerate a key.

func (*AggregationQuery) WithAvgPath added in v1.14.0 

func (a *AggregationQuery) WithAvgPath(fp FieldPath, alias string) *AggregationQuery

WithAvgPath specifies that the aggregation query should provide an average of the values of the provided field in the results returned by the underlying Query. The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the average value. If alias is empty, Firestore will autogenerate a key.

func (*AggregationQuery) WithCount added in v1.8.0 

func (a *AggregationQuery) WithCount(alias string) *AggregationQuery

WithCount specifies that the aggregation query provide a count of results returned by the underlying Query.

func (*AggregationQuery) WithSum added in v1.14.0 

func (a *AggregationQuery) WithSum(path string, alias string) *AggregationQuery

WithSum specifies that the aggregation query should provide a sum of the values of the provided field in the results returned by the underlying Query. The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the sum value. If alias is empty, Firestore will autogenerate a key.

func (*AggregationQuery) WithSumPath added in v1.14.0 

func (a *AggregationQuery) WithSumPath(fp FieldPath, alias string) *AggregationQuery

WithSumPath specifies that the aggregation query should provide a sum of the values of the provided field in the results returned by the underlying Query. The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the sum value. If alias is empty, Firestore will autogenerate a key.

type AggregationResponse added in v1.17.0 

type AggregationResponse struct {
	Result AggregationResult

	// Query explain metrics. This is only present when ExplainOptions is provided.
	ExplainMetrics *ExplainMetrics
}

AggregationResponse contains AggregationResult and response from the run options in the query

type AggregationResult added in v1.8.0 

type AggregationResult map[string]interface{}

AggregationResult contains the results of an aggregation query.

type AliasedAggregate added in v1.21.0 

type AliasedAggregate struct {
	// contains filtered or unexported fields
}

AliasedAggregate is an aliased AggregateFunction. It's used to give a name to the result of an aggregation.

func Accumulators added in v1.22.0 

func Accumulators(a ...*AliasedAggregate) []*AliasedAggregate

Accumulators is a helper function that returns its arguments as a slice of *AliasedAggregate. It is used to provide variadic-like ergonomics for the Aggregate pipeline stage.

type AliasedExpression added in v1.21.0 

type AliasedExpression struct {
	// contains filtered or unexported fields
}

AliasedExpression represents an expression with an alias. It implements the Selectable interface, allowing it to be used in projection stages like `Select` and `AddFields`.

func AliasedExpressions added in v1.22.0 

func AliasedExpressions(v ...*AliasedExpression) []*AliasedExpression

AliasedExpressions is a helper function that returns its arguments as a slice of *AliasedExpression. It is used to provide variadic-like ergonomics for the Pipeline.Define pipeline stage.

type AndFilter added in v1.10.0 

type AndFilter struct {
	Filters []EntityFilter
}

AndFilter represents the intersection of two or more filters.

type BooleanExpression added in v1.21.0 

type BooleanExpression interface {
	Expression // Embed Expr interface

	// Conditional creates an expression that evaluates a condition and returns one of two expressions.
	//
	// The parameter 'thenVal' is the expression to return if the condition is true.
	// The parameter 'elseVal' is the expression to return if the condition is false.
	Conditional(thenVal, elseVal any) Expression
	// IfErrorBoolean creates a boolean expression that evaluates and returns the receiver expression if it does not produce an error;
	// otherwise, it evaluates and returns `catchExpr`.
	//
	// The parameter 'catchExpr' is the boolean expression to return if the receiver expression errors.
	IfErrorBoolean(catchExpr BooleanExpression) BooleanExpression
	// Not creates an expression that negates a boolean expression.
	Not() BooleanExpression
	// CountIf creates an aggregation that counts the number of stage inputs where the this boolean expression
	// evaluates to true.
	CountIf() AggregateFunction
	// contains filtered or unexported methods
}

BooleanExpression is an interface that represents a boolean expression in a pipeline.

func And added in v1.21.0 

func And(condition BooleanExpression, right ...BooleanExpression) BooleanExpression

And creates an expression that performs a logical 'AND' operation.

func ArrayContains added in v1.21.0 

func ArrayContains(exprOrFieldPath any, value any) BooleanExpression

ArrayContains creates an expression that checks if an array contains a specified element. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - value is the element to check for.

Example: 

// Check if the 'tags' array contains "Go".
ArrayContains("tags", "Go")

func ArrayContainsAll added in v1.21.0 

func ArrayContainsAll(exprOrFieldPath any, values any) BooleanExpression

ArrayContainsAll creates an expression that checks if an array contains all of the provided values. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - values can be an array of values or an expression that evaluates to an array.

Example: 

// Check if the 'tags' array contains both "Go" and "Firestore".
ArrayContainsAll("tags", []string{"Go", "Firestore"})

func ArrayContainsAny added in v1.21.0 

func ArrayContainsAny(exprOrFieldPath any, values any) BooleanExpression

ArrayContainsAny creates an expression that checks if an array contains any of the provided values. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - values can be an array of values or an expression that evaluates to an array.

Example: 

// Check if the 'tags' array contains either "Go" or "Firestore".
ArrayContainsAny("tags", []string{"Go", "Firestore"})

func DocumentMatches added in v1.22.0 

func DocumentMatches(query string) BooleanExpression

DocumentMatches creates a boolean expression that performs a full-text search on all indexed search fields in the document.

This Expression can only be used within a Search stage.

Example: 

client.Pipeline().Collection("restaurants").
	Search(WithSearchQuery(DocumentMatches("waffles OR pancakes")))

- query: Define the search query using the search domain-specific language (DSL).

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func EndsWith added in v1.21.0 

func EndsWith(exprOrFieldPath any, suffix any) BooleanExpression

EndsWith creates an expression that checks if a string field or expression ends with a given suffix. - exprOrFieldPath can be a field path string, FieldPath or Expression. - suffix string or Expression to check for.

Example: 

// Check if the 'filename' field ends with ".go".
EndsWith("filename", ".go")

func Equal added in v1.21.0 

func Equal(left, right any) BooleanExpression

Equal creates an expression that checks if field's value or an expression is equal to an expression or a constant value, returning it as a BooleanExpr.

Example: 

	// Check if the 'age' field is equal to 21
	Equal(FieldOf("age"), 21)

	// Check if the 'age' field is equal to an expression
 	Equal(FieldOf("age"), FieldOf("minAge").Add(10))

	// Check if the 'age' field is equal to the 'limit' field
	Equal("age", FieldOf("limit"))

	// Check if the 'city' field is equal to string constant "London"
	Equal("city", "London")

func EqualAny added in v1.21.0 

func EqualAny(exprOrFieldPath any, values any) BooleanExpression

EqualAny creates an expression that checks if a field or expression is equal to any of the provided values. - exprOrFieldPath can be a field path string, FieldPath or an Expression. - values can be an array of values or an expression that evaluates to an array.

Example: 

// Check if the 'status' field is either "active" or "pending".
EqualAny("status", []string{"active", "pending"})

func FieldExists added in v1.21.0 

func FieldExists(exprOrField any) BooleanExpression

FieldExists creates an expression that checks if a field exists.

func GreaterThan added in v1.21.0 

func GreaterThan(left, right any) BooleanExpression

GreaterThan creates an expression that checks if field's value or an expression is greater than an expression or a constant value, returning it as a BooleanExpr.

Example: 

	// Check if the 'age' field is greater than 21
	GreaterThan(FieldOf("age"), 21)

	// Check if the 'age' field is greater than an expression
 	GreaterThan(FieldOf("age"), FieldOf("minAge").Add(10))

	// Check if the 'age' field is greater than the 'limit' field
	GreaterThan("age", FieldOf("limit"))

func GreaterThanOrEqual added in v1.21.0 

func GreaterThanOrEqual(left, right any) BooleanExpression

GreaterThanOrEqual creates an expression that checks if field's value or an expression is greater than or equal to an expression or a constant value, returning it as a BooleanExpr.

Example: 

	// Check if the 'age' field is greater than or equal to 21
	GreaterThanOrEqual(FieldOf("age"), 21)

	// Check if the 'age' field is greater than or equal to an expression
 	GreaterThanOrEqual(FieldOf("age"), FieldOf("minAge").Add(10))

	// Check if the 'age' field is greater than or equal to the 'limit' field
	GreaterThanOrEqual("age", FieldOf("limit"))

func IfErrorBoolean added in v1.21.0 

func IfErrorBoolean(tryExpr BooleanExpression, catchExpr BooleanExpression) BooleanExpression

IfErrorBoolean creates a boolean expression that evaluates and returns `tryExpr` if it does not produce an error; otherwise, it evaluates and returns `catchExpr`. It returns a new BooleanExpression representing the if_error operation. - tryExpr is the boolean expression to try. - catchExpr is the boolean expression to return if `tryExpr` errors.

func IsAbsent added in v1.21.0 

func IsAbsent(exprOrField any) BooleanExpression

IsAbsent creates an expression that checks if an expression evaluates to an absent value.

func IsError added in v1.21.0 

func IsError(expr Expression) BooleanExpression

IsError creates an expression that checks if an expression evaluates to an error.

func IsType added in v1.22.0 

func IsType(exprOrField any, dataType string) BooleanExpression

IsType creates an expression that checks if an expression is of a specific type.

  • exprOrField can be a field path string, FieldPath or an Expression.
  • dataType can be a valid type name. Valid values are "null", "array", "boolean", "bytes", "timestamp", "geo_point", "number", "int32", "int64", "float64", "decimal128", "map", "reference", "string", "vector", "max_key", "min_key", "min_array", "object_id", "regex", "request_timestamp"

func LessThan added in v1.21.0 

func LessThan(left, right any) BooleanExpression

LessThan creates an expression that checks if field's value or an expression is less than an expression or a constant value, returning it as a BooleanExpr.

Example: 

	// Check if the 'age' field is less than 21
	LessThan(FieldOf("age"), 21)

	// Check if the 'age' field is less than an expression
 	LessThan(FieldOf("age"), FieldOf("minAge").Add(10))

	// Check if the 'age' field is less than the 'limit' field
	LessThan("age", FieldOf("limit"))

func LessThanOrEqual added in v1.21.0 

func LessThanOrEqual(left, right any) BooleanExpression

LessThanOrEqual creates an expression that checks if field's value or an expression is less than or equal to an expression or a constant value, returning it as a BooleanExpr.

Example: 

	// Check if the 'age' field is less than or equal to 21
	LessThanOrEqual(FieldOf("age"), 21)

	// Check if the 'age' field is less than or equal to an expression
 	LessThanOrEqual(FieldOf("age"), FieldOf("minAge").Add(10))

	// Check if the 'age' field is less than or equal to the 'limit' field
	LessThanOrEqual("age", FieldOf("limit"))

func Like added in v1.21.0 

func Like(exprOrFieldPath any, pattern any) BooleanExpression

Like creates an expression that performs a case-sensitive wildcard string comparison. - exprOrFieldPath can be a field path string, FieldPath or Expression. - pattern string or Expression to search for. You can use "%" as a wildcard character.

Example: 

// Check if the 'name' field starts with "G".
Like("name", "G%")

func Nor added in v1.22.0 

func Nor(condition BooleanExpression, right ...BooleanExpression) BooleanExpression

Nor creates an expression that performs a logical 'NOR' operation.

func Not added in v1.21.0 

func Not(condition BooleanExpression) BooleanExpression

Not creates an expression that negates a boolean expression.

func NotEqual added in v1.21.0 

func NotEqual(left, right any) BooleanExpression

NotEqual creates an expression that checks if field's value or an expression is not equal to an expression or a constant value, returning it as a BooleanExpr.

Example: 

	// Check if the 'age' field is not equal to 21
	NotEqual(FieldOf("age"), 21)

	// Check if the 'age' field is not equal to an expression
 	NotEqual(FieldOf("age"), FieldOf("minAge").Add(10))

	// Check if the 'age' field is not equal to the 'limit' field
	NotEqual("age", FieldOf("limit"))

	// Check if the 'city' field is not equal to string constant "London"
	NotEqual("city", "London")

func NotEqualAny added in v1.21.0 

func NotEqualAny(exprOrFieldPath any, values any) BooleanExpression

NotEqualAny creates an expression that checks if a field or expression is not equal to any of the provided values. - exprOrFieldPath can be a field path string, FieldPath or an Expression. - values can be an array of values or an expression that evaluates to an array.

Example: 

// Check if the 'status' field is not "archived" or "deleted".
NotEqualAny("status", []string{"archived", "deleted"})

func Or added in v1.21.0 

func Or(condition BooleanExpression, right ...BooleanExpression) BooleanExpression

Or creates an expression that performs a logical 'OR' operation.

func RawBooleanFunction added in v1.22.0 

func RawBooleanFunction(name string, exprs ...any) BooleanExpression

RawBooleanFunction creates a 'raw' boolean function expression. This is useful if the expression is available in the backend, but not yet in the current version of the SDK.

func RegexContains added in v1.21.0 

func RegexContains(exprOrFieldPath any, pattern any) BooleanExpression

RegexContains creates an expression that checks if a string contains a match for a regular expression. - exprOrFieldPath can be a field path string, FieldPath or Expression. - pattern is the regular expression to search for.

Example: 

// Check if the 'email' field contains a gmail address.
RegexContains("email", "@gmail\\.com$")

func RegexMatch added in v1.21.0 

func RegexMatch(exprOrFieldPath any, pattern any) BooleanExpression

RegexMatch creates an expression that checks if a string matches a regular expression. - exprOrFieldPath can be a field path string, FieldPath or Expression. - pattern is the regular expression to match against.

Example: 

// Check if the 'zip_code' field is a 5-digit number.
RegexMatch("zip_code", "^[0-9]{5}$")

func StartsWith added in v1.21.0 

func StartsWith(exprOrFieldPath any, prefix any) BooleanExpression

StartsWith creates an expression that checks if a string field or expression starts with a given prefix. - exprOrFieldPath can be a field path string, FieldPath or Expression. - prefix string or Expression to check for.

Example: 

// Check if the 'name' field starts with "Mr.".
StartsWith("name", "Mr.")

func StringContains added in v1.21.0 

func StringContains(exprOrFieldPath any, substring any) BooleanExpression

StringContains creates an expression that checks if a string contains a specified substring. - exprOrFieldPath can be a field path string, FieldPath or Expression. - substring is the string to search for.

Example: 

// Check if the 'description' field contains the word "Firestore".
StringContains("description", "Firestore")

func Xor added in v1.21.0 

func Xor(condition BooleanExpression, right ...BooleanExpression) BooleanExpression

Xor creates an expression that performs a logical 'XOR' operation.

type BulkWriter added in v1.7.0 

type BulkWriter struct {
	// contains filtered or unexported fields
}

A BulkWriter supports concurrent writes to multiple documents. The BulkWriter submits document writes in maximum batches of 20 writes per request. Each request can contain many different document writes: create, delete, update, and set are all supported.

Only one operation (create, set, update, delete) per document is allowed. BulkWriter cannot promise atomicity: individual writes can fail or succeed independent of each other. Bulkwriter does not apply writes in any set order; thus a document can't have set on it immediately after creation.

func (*BulkWriter) Create added in v1.7.0 

func (bw *BulkWriter) Create(doc *DocumentRef, datum interface{}) (*BulkWriterJob, error)

Create adds a document creation write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.

func (*BulkWriter) Delete added in v1.7.0 

func (bw *BulkWriter) Delete(doc *DocumentRef, preconds ...Precondition) (*BulkWriterJob, error)

Delete adds a document deletion write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.

func (*BulkWriter) End added in v1.7.0 

func (bw *BulkWriter) End()

End sends all enqueued writes in parallel and closes the BulkWriter to new requests. After calling End(), calling any additional method automatically returns with an error. This method completes when there are no more pending writes in the queue.

func (*BulkWriter) Flush added in v1.7.0 

func (bw *BulkWriter) Flush()

Flush commits all writes that have been enqueued up to this point in parallel. This method blocks execution.

func (*BulkWriter) Set added in v1.7.0 

func (bw *BulkWriter) Set(doc *DocumentRef, datum interface{}, opts ...SetOption) (*BulkWriterJob, error)

Set adds a document set write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.

func (*BulkWriter) Update added in v1.7.0 

func (bw *BulkWriter) Update(doc *DocumentRef, updates []Update, preconds ...Precondition) (*BulkWriterJob, error)

Update adds a document update write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.

type BulkWriterJob added in v1.7.0 

type BulkWriterJob struct {
	// contains filtered or unexported fields
}

BulkWriterJob provides read-only access to the results of a BulkWriter write attempt.

func (*BulkWriterJob) Results added in v1.7.0 

func (j *BulkWriterJob) Results() (*WriteResult, error)

Results gets the results of the BulkWriter write attempt. This method blocks if the results for this BulkWriterJob haven't been received.

type Client 

type Client struct {
	UsesEmulator bool // a boolean that indicates if the client is using the emulator
	// contains filtered or unexported fields
}

A Client provides access to the Firestore service.

func NewClient 

func NewClient(ctx context.Context, projectID string, opts ...option.ClientOption) (*Client, error)

NewClient creates a new Firestore client that uses the given project.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close() // Close client when done.
	_ = client           // TODO: Use client.
}

func NewClientWithDatabase added in v1.13.0 

func NewClientWithDatabase(ctx context.Context, projectID string, databaseID string, opts ...option.ClientOption) (*Client, error)

NewClientWithDatabase creates a new Firestore client that accesses the specified database.

func NewRESTClient added in v1.19.0 

func NewRESTClient(ctx context.Context, projectID string, opts ...option.ClientOption) (*Client, error)

NewRESTClient creates a new Firestore client that uses the REST API.

func (*Client) Batch deprecated 

func (c *Client) Batch() *WriteBatch

Batch returns a WriteBatch.

Deprecated: The WriteBatch API has been replaced with the transaction and the bulk writer API. For atomic transaction operations, use `Transaction`. For bulk read and write operations, use `BulkWriter`.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()
	b := client.Batch()
	_ = b // TODO: Use batch.
}

func (*Client) BulkWriter added in v1.7.0 

func (c *Client) BulkWriter(ctx context.Context) *BulkWriter

BulkWriter returns a BulkWriter instance. The context passed to the BulkWriter remains stored through the lifecycle of the object. This context allows callers to cancel BulkWriter operations.

func (*Client) Close 

func (c *Client) Close() error

Close closes any resources held by the client.

Close need not be called at program exit.

func (*Client) Collection 

func (c *Client) Collection(path string) *CollectionRef

Collection creates a reference to a collection with the given path. A path is a sequence of IDs separated by slashes.

Collection returns nil if path contains an even number of IDs or any ID is empty.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()
	coll1 := client.Collection("States")
	coll2 := client.Collection("States/NewYork/Cities")
	fmt.Println(coll1, coll2)
}

func (*Client) CollectionGroup 

func (c *Client) CollectionGroup(collectionID string) *CollectionGroupRef

CollectionGroup creates a reference to a group of collections that include the given ID, regardless of parent document.

For example, consider: France/Cities/Paris = {population: 100} Canada/Cities/Montreal = {population: 90}

CollectionGroup can be used to query across all "Cities" regardless of its parent "Countries". See ExampleCollectionGroup for a complete example.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	// Given:
	// France/Cities/Paris = {population: 100}
	// Canada/Cities/Montreal = {population: 95}

	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	// Query for ANY city with >95 pop, regardless of country.
	docs, err := client.CollectionGroup("Cities").
		Where("pop", ">", 95).
		OrderBy("pop", firestore.Desc).
		Limit(10).
		Documents(ctx).
		GetAll()
	if err != nil {
		// TODO: Handle error.
	}

	_ = docs // TODO: Use docs.
}

func (*Client) Collections 

func (c *Client) Collections(ctx context.Context) *CollectionIterator

Collections returns an iterator over the top-level collections.

func (*Client) Doc 

func (c *Client) Doc(path string) *DocumentRef

Doc creates a reference to a document with the given path. A path is a sequence of IDs separated by slashes.

Doc returns nil if path contains an odd number of IDs or any ID is empty.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()
	doc1 := client.Doc("States/NewYork")
	doc2 := client.Doc("States/NewYork/Cities/Albany")
	fmt.Println(doc1, doc2)
}

func (*Client) DocFromFullPath added in v1.19.0 

func (c *Client) DocFromFullPath(fullPath string) *DocumentRef

DocFromFullPath creates a reference to a document from its full, absolute path, also known as its Google Cloud resource name. The path must be in the format: "projects/{projectID}/databases/{databaseID}/documents/{collectionID}/{documentID}/..." This method returns nil if:

  • The fullPath is empty.
  • The fullPath does not match the expected resource name format (e.g., missing "projects/" or "/documents/").
  • The projectID or databaseID in the fullPath do not match the client's configuration.
  • The fullPath refers to a collection instead of a document (i.e., has an odd number of segments after "/documents/").
  • The fullPath contains any empty path segments.

func (*Client) GetAll 

func (c *Client) GetAll(ctx context.Context, docRefs []*DocumentRef) (_ []*DocumentSnapshot, err error)

GetAll retrieves multiple documents with a single call. The DocumentSnapshots are returned in the order of the given DocumentRefs. The return value will always contain the same number of DocumentSnapshots as the number of DocumentRefs in the input.

If the same DocumentRef is specified multiple times in the input, the return value will contain the same number of DocumentSnapshots referencing the same document.

If a document is not present, the corresponding DocumentSnapshot's Exists method will return false.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()
	docs, err := client.GetAll(ctx, []*firestore.DocumentRef{
		client.Doc("States/NorthCarolina"),
		client.Doc("States/SouthCarolina"),
		client.Doc("States/WestCarolina"),
		client.Doc("States/EastCarolina"),
	})
	if err != nil {
		// TODO: Handle error.
	}
	// docs is a slice with four DocumentSnapshots, but the last two are
	// nil because there is no West or East Carolina.
	fmt.Println(docs)
}

func (*Client) Pipeline added in v1.21.0 

func (c *Client) Pipeline() *PipelineSource

Pipeline creates a PipelineSource to start building a Firestore pipeline.

func (*Client) RunTransaction 

func (c *Client) RunTransaction(ctx context.Context, f func(context.Context, *Transaction) error, opts ...TransactionOption) (err error)

RunTransaction runs f in a transaction. f should use the transaction it is given for all Firestore operations. For any operation requiring a context, f should use the context it is passed, not the first argument to RunTransaction.

f must not call Commit or Rollback on the provided Transaction.

If f returns nil, RunTransaction commits the transaction. If the commit fails due to a conflicting transaction, RunTransaction retries f. It gives up and returns an error after a number of attempts that can be configured with the MaxAttempts option. If the commit succeeds, RunTransaction returns a nil error.

If f returns non-nil, then the transaction will be rolled back and this method will return the same error. The function f is not retried.

Note that when f returns, the transaction is not committed. Calling code must not assume that any of f's changes have been committed until RunTransaction returns nil.

Since f may be called more than once, f should usually be idempotent – that is, it should have the same result when called multiple times.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	// write the CommitResponse here, via firestore.WithCommitResponse (below)
	var cr firestore.CommitResponse

	nm := client.Doc("States/NewMexico")
	err = client.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
		doc, err := tx.Get(nm) // tx.Get, NOT nm.Get!
		if err != nil {
			return err
		}
		pop, err := doc.DataAt("pop")
		if err != nil {
			return err
		}
		return tx.Update(nm, []firestore.Update{{Path: "pop", Value: pop.(float64) + 0.2}})
	}, firestore.WithCommitResponseTo(&cr))
	if err != nil {
		// TODO: Handle error.
	}
	// CommitResponse can be accessed here
}

func (*Client) WithAlwaysUseImplicitOrderBy added in v1.22.0 

func (c *Client) WithAlwaysUseImplicitOrderBy(b bool) *Client

WithAlwaysUseImplicitOrderBy configures the default behavior for queries. If enabled, queries will automatically inject an OrderBy clause for the Document ID (`__name__`) if one is not explicitly provided. In addition, it will automatically inject OrderBy clauses for any inequality filters (e.g. >, <, !=) present in the query if they are missing from the explicit orders. This ensures strictly deterministic query results and is especially useful when executing backwards pagination (e.g. limitToLast) without cursors.

func (*Client) WithReadOptions added in v1.8.0 

func (c *Client) WithReadOptions(opts ...ReadOption) *Client

WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.

type CollectionGroupOption added in v1.21.0 

type CollectionGroupOption interface {
	StageOption
	// contains filtered or unexported methods
}

CollectionGroupOption is an option for a CollectionGroup pipeline stage.

type CollectionGroupRef 

type CollectionGroupRef struct {

	// Use the methods of Query on a CollectionGroupRef to create and run queries.
	Query
	// contains filtered or unexported fields
}

A CollectionGroupRef is a reference to a group of collections sharing the same ID.

func (CollectionGroupRef) GetPartitionedQueries added in v1.6.0 

func (cgr CollectionGroupRef) GetPartitionedQueries(ctx context.Context, partitionCount int) ([]Query, error)

GetPartitionedQueries returns a slice of Query objects, each containing a partition of a collection group. partitionCount must be a positive value and the number of returned partitions may be less than the requested number if providing the desired number would result in partitions with very few documents.

If a Collection Group Query would return a large number of documents, this can help to subdivide the query to smaller working units that can be distributed.

If the goal is to run the queries across processes or workers, it may be useful to use `Query.Serialize` and `Query.Deserialize` to serialize the query.

type CollectionIterator 

type CollectionIterator struct {
	// contains filtered or unexported fields
}

CollectionIterator is an iterator over sub-collections of a document.

func (*CollectionIterator) GetAll 

func (it *CollectionIterator) GetAll() ([]*CollectionRef, error)

GetAll returns all the collections remaining from the iterator.

func (*CollectionIterator) Next 

func (it *CollectionIterator) Next() (*CollectionRef, error)

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

func (*CollectionIterator) PageInfo 

func (it *CollectionIterator) PageInfo() *iterator.PageInfo

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

type CollectionOption added in v1.21.0 

type CollectionOption interface {
	StageOption
	// contains filtered or unexported methods
}

CollectionOption is an option for a Collection pipeline stage.

type CollectionRef 

type CollectionRef struct {

	// Parent is the document of which this collection is a part. It is
	// nil for top-level collections.
	Parent *DocumentRef

	// The full resource path of the collection: "projects/P/databases/D/documents..."
	Path string

	// ID is the collection identifier.
	ID string

	// Use the methods of Query on a CollectionRef to create and run queries.
	Query
	// contains filtered or unexported fields
}

A CollectionRef is a reference to Firestore collection.

func (*CollectionRef) Add 

func (c *CollectionRef) Add(ctx context.Context, data interface{}) (*DocumentRef, *WriteResult, error)

Add generates a DocumentRef with a unique ID. It then creates the document with the given data, which can be a map[string]interface{}, a struct or a pointer to a struct.

Add returns an error in the unlikely event that a document with the same ID already exists.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	doc, wr, err := client.Collection("Users").Add(ctx, map[string]interface{}{
		"name":  "Alice",
		"email": "aj@example.com",
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(doc, wr)
}

func (*CollectionRef) Doc 

func (c *CollectionRef) Doc(id string) *DocumentRef

Doc returns a DocumentRef that refers to the document in the collection with the given identifier.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	fl := client.Collection("States").Doc("Florida")
	ta := client.Collection("States").Doc("Florida/Cities/Tampa")

	fmt.Println(fl, ta)
}

func (*CollectionRef) DocumentRefs 

func (c *CollectionRef) DocumentRefs(ctx context.Context) *DocumentRefIterator

DocumentRefs returns references to all the documents in the collection, including missing documents. A missing document is a document that does not exist but has sub-documents.

func (*CollectionRef) NewDoc 

func (c *CollectionRef) NewDoc() *DocumentRef

NewDoc returns a DocumentRef with a uniquely generated ID.

NewDoc will panic if crypto/rand cannot generate enough bytes to make a new doc ID.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	doc := client.Collection("Users").NewDoc()

	fmt.Println(doc)
}

func (*CollectionRef) WithReadOptions added in v1.8.0 

func (c *CollectionRef) WithReadOptions(opts ...ReadOption) *CollectionRef

WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.

type CollectionSourceOption added in v1.22.0 

type CollectionSourceOption interface {
	CollectionOption
	CollectionGroupOption
}

CollectionSourceOption is an option that can be applied to both Collection and CollectionGroup pipeline stages.

func WithForceIndex added in v1.22.0 

func WithForceIndex(index string) CollectionSourceOption

WithForceIndex specifies an index to force the query to use.

func WithIgnoreIndexFields added in v1.22.0 

func WithIgnoreIndexFields(fields ...string) CollectionSourceOption

WithIgnoreIndexFields specifies fields to ignore when selecting an index.

type CommitResponse added in v1.18.0 

type CommitResponse struct {
	// contains filtered or unexported fields
}

CommitResponse exposes information about a committed transaction.

func (*CommitResponse) CommitTime added in v1.18.0 

func (r *CommitResponse) CommitTime() time.Time

CommitTime returns the commit time from the commit response.

type CompositeFilter added in v1.10.0 

type CompositeFilter interface {
	EntityFilter
	// contains filtered or unexported methods
}

CompositeFilter represents a composite Firestore filter.

type DatabaseOption added in v1.22.0 

type DatabaseOption interface {
	StageOption
	// contains filtered or unexported methods
}

DatabaseOption is an option for a Database pipeline stage.

type DefineOption added in v1.22.0 

type DefineOption interface {
	StageOption
	// contains filtered or unexported methods
}

DefineOption is an option for a Define pipeline stage.

type DeleteOption added in v1.22.0 

type DeleteOption interface {
	StageOption
	// contains filtered or unexported methods
}

DeleteOption is an option for a Delete pipeline stage.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

type Direction 

type Direction int32

Direction is the sort direction for result ordering. 

const (
	// Asc sorts results from smallest to largest.
	Asc Direction = Direction(pb.StructuredQuery_ASCENDING)

	// Desc sorts results from largest to smallest.
	Desc Direction = Direction(pb.StructuredQuery_DESCENDING)
)

type DistanceMeasure added in v1.16.0 

type DistanceMeasure int32

DistanceMeasure is the distance measure to use when comparing vectors with Query.FindNearest or Query.FindNearestPath. 

const (
	// DistanceMeasureEuclidean is used to measures the Euclidean distance between the vectors. See
	// [Euclidean] to learn more.
	//
	// [Euclidean]: https://en.wikipedia.org/wiki/Euclidean_distance
	DistanceMeasureEuclidean DistanceMeasure = DistanceMeasure(pb.StructuredQuery_FindNearest_EUCLIDEAN)

	// DistanceMeasureCosine compares vectors based on the angle between them, which allows you to
	// measure similarity that isn't based on the vectors magnitude.
	// We recommend using dot product with unit normalized vectors instead of
	// cosine distance, which is mathematically equivalent with better
	// performance. See [Cosine Similarity] to learn more.
	//
	// [Cosine Similarity]: https://en.wikipedia.org/wiki/Cosine_similarity
	DistanceMeasureCosine DistanceMeasure = DistanceMeasure(pb.StructuredQuery_FindNearest_COSINE)

	// DistanceMeasureDotProduct is similar to cosine but is affected by the magnitude of the vectors. See
	// [Dot Product] to learn more.
	//
	// [Dot Product]: https://en.wikipedia.org/wiki/Dot_product
	DistanceMeasureDotProduct DistanceMeasure = DistanceMeasure(pb.StructuredQuery_FindNearest_DOT_PRODUCT)
)

type DistinctOption added in v1.22.0 

type DistinctOption interface {
	StageOption
	// contains filtered or unexported methods
}

DistinctOption is an option for a Distinct pipeline stage.

type DocumentChange 

type DocumentChange struct {
	Kind DocumentChangeKind
	Doc  *DocumentSnapshot
	// The document snapshot before the change.
	// This will be nil for DocumentAdded events.
	// For DocumentRemoved events, this will be the same as Doc.
	// For DocumentModified events, this will be the document before the modification.
	OldDoc *DocumentSnapshot
	// The zero-based index of the document in the sequence of query results prior to this change,
	// or -1 if the document was not present.
	OldIndex int
	// The zero-based index of the document in the sequence of query results after this change,
	// or -1 if the document is no longer present.
	NewIndex int
}

A DocumentChange describes the change to a document from one query snapshot to the next.

type DocumentChangeKind 

type DocumentChangeKind int

DocumentChangeKind describes the kind of change to a document between query snapshots. 

const (
	// DocumentAdded indicates that the document was added for the first time.
	DocumentAdded DocumentChangeKind = iota
	// DocumentRemoved indicates that the document was removed.
	DocumentRemoved
	// DocumentModified indicates that the document was modified.
	DocumentModified
)

func (DocumentChangeKind) String added in v1.19.0 

func (k DocumentChangeKind) String() string

String returns the string representation of the DocumentChangeKind.

type DocumentIterator 

type DocumentIterator struct {
	// contains filtered or unexported fields
}

DocumentIterator is an iterator over documents returned by a query.

func (*DocumentIterator) ExplainMetrics added in v1.17.0 

func (it *DocumentIterator) ExplainMetrics() (*ExplainMetrics, error)

ExplainMetrics returns query explain metrics. This is only present when ExplainOptions is added to the query (see Query.WithRunOptions), and after the iterator reaches the end. An error is returned if either of those conditions does not hold.

func (*DocumentIterator) GetAll 

func (it *DocumentIterator) GetAll() ([]*DocumentSnapshot, error)

GetAll returns all the documents remaining from the iterator. It is not necessary to call Stop on the iterator after calling GetAll.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	q := client.Collection("States").
		Where("pop", ">", 10).
		OrderBy("pop", firestore.Desc).
		Limit(10) // a good idea with GetAll, to avoid filling memory
	docs, err := q.Documents(ctx).GetAll()
	if err != nil {
		// TODO: Handle error.
	}
	for _, doc := range docs {
		fmt.Println(doc.Data())
	}
}

func (*DocumentIterator) Next 

func (it *DocumentIterator) Next() (*DocumentSnapshot, error)

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
	"google.golang.org/api/iterator"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	q := client.Collection("States").
		Where("pop", ">", 10).
		OrderBy("pop", firestore.Desc)
	iter := q.Documents(ctx)
	defer iter.Stop()
	for {
		doc, err := iter.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			// TODO: Handle error.
		}
		fmt.Println(doc.Data())
	}
}

func (*DocumentIterator) Stop 

func (it *DocumentIterator) Stop()

Stop stops the iterator, freeing its resources. Always call Stop when you are done with a DocumentIterator. It is not safe to call Stop concurrently with Next.

type DocumentRef 

type DocumentRef struct {
	// The CollectionRef that this document is a part of. Never nil.
	Parent *CollectionRef

	// The full resource path of the document. A document "doc-1" in collection
	// "coll-1" would be: "projects/P/databases/D/documents/coll-1/doc-1".
	Path string

	// The ID of the document: the last component of the resource path.
	ID string
	// contains filtered or unexported fields
}

A DocumentRef is a reference to a Firestore document.

func (*DocumentRef) Collection 

func (d *DocumentRef) Collection(id string) *CollectionRef

Collection returns a reference to sub-collection of this document.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	mi := client.Collection("States").Doc("Michigan")
	cities := mi.Collection("Cities")

	fmt.Println(cities)
}

func (*DocumentRef) Collections 

func (d *DocumentRef) Collections(ctx context.Context) *CollectionIterator

Collections returns an iterator over the immediate sub-collections of the document.

func (*DocumentRef) Create 

func (d *DocumentRef) Create(ctx context.Context, data interface{}) (_ *WriteResult, err error)

Create creates the document with the given data. It returns an error if a document with the same ID already exists.

The data argument can be a map with string keys, a struct, or a pointer to a struct. The map keys or exported struct fields become the fields of the firestore document. The values of data are converted to Firestore values as follows:

  • bool converts to Bool.
  • string converts to String.
  • int, int8, int16, int32 and int64 convert to Integer.
  • uint8, uint16 and uint32 convert to Integer. uint, uint64 and uintptr are disallowed, because they may be able to represent values that cannot be represented in an int64, which is the underlying type of a Integer.
  • float32 and float64 convert to Double.
  • []byte converts to Bytes.
  • time.Time and *ts.Timestamp convert to Timestamp. ts is the package "google.golang.org/protobuf/types/known/timestamppb".
  • *latlng.LatLng converts to GeoPoint. latlng is the package "google.golang.org/genproto/googleapis/type/latlng". You should always use a pointer to a LatLng.
  • Slices convert to Array.
  • *firestore.DocumentRef converts to Reference.
  • Maps and structs convert to Map.
  • nils of any type convert to Null.

Pointers and interface{} are also permitted, and their elements processed recursively.

Struct fields can have tags like those used by the encoding/json package. Tags begin with "firestore:" and are followed by "-", meaning "ignore this field," or an alternative name for the field. Following the name, these comma-separated options may be provided:

  • omitempty: Do not encode this field if it is empty. A value is empty if it is a zero value, or an array, slice or map of length zero.
  • serverTimestamp: The field must be of type time.Time. serverTimestamp is a sentinel token that tells Firestore to substitute the server time into that field. When writing, if the field has the zero value, the server will populate the stored document with the time that the request is processed. However, if the field value is non-zero it won't be saved.
Example (Map) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	wr, err := client.Doc("States/Colorado").Create(ctx, map[string]interface{}{
		"capital": "Denver",
		"pop":     5.5,
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}
Example (Struct) 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	type State struct {
		Capital    string  `firestore:"capital"`
		Population float64 `firestore:"pop"` // in millions
	}

	wr, err := client.Doc("States/Colorado").Create(ctx, State{
		Capital:    "Denver",
		Population: 5.5,
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}

func (*DocumentRef) Delete 

func (d *DocumentRef) Delete(ctx context.Context, preconds ...Precondition) (_ *WriteResult, err error)

Delete deletes the document. If the document doesn't exist, it does nothing and returns no error.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	// Oops, Ontario is a Canadian province...
	if _, err = client.Doc("States/Ontario").Delete(ctx); err != nil {
		// TODO: Handle error.
	}
}

func (*DocumentRef) Get 

func (d *DocumentRef) Get(ctx context.Context) (_ *DocumentSnapshot, err error)

Get retrieves the document. If the document does not exist, Get return a NotFound error, which can be checked with 

status.Code(err) == codes.NotFound

In that case, Get returns a non-nil DocumentSnapshot whose Exists method return false and whose ReadTime is the time of the failed read operation.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	docsnap, err := client.Doc("States/Ohio").Get(ctx)
	if err != nil {
		// TODO: Handle error.
	}
	_ = docsnap // TODO: Use DocumentSnapshot.
}

func (*DocumentRef) Set 

func (d *DocumentRef) Set(ctx context.Context, data interface{}, opts ...SetOption) (_ *WriteResult, err error)

Set creates or overwrites the document with the given data. See DocumentRef.Create for the acceptable values of data. Without options, Set overwrites the document completely. Specify one of the Merge options to preserve an existing document's fields. To delete some fields, use a Merge option with firestore.Delete as the field value.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	// Overwrite the document with the given data. Any other fields currently
	// in the document will be removed.
	wr, err := client.Doc("States/Alabama").Set(ctx, map[string]interface{}{
		"capital": "Montgomery",
		"pop":     4.9,
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}
Example (Merge) 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	// Overwrite only the fields in the map; preserve all others.
	_, err = client.Doc("States/Alabama").Set(ctx, map[string]interface{}{
		"pop": 5.2,
	}, firestore.MergeAll)
	if err != nil {
		// TODO: Handle error.
	}

	type State struct {
		Capital    string  `firestore:"capital"`
		Population float64 `firestore:"pop"` // in millions
	}

	// To do a merging Set with struct data, specify the exact fields to overwrite.
	// MergeAll is disallowed here, because it would probably be a mistake: the "capital"
	// field would be overwritten with the empty string.
	_, err = client.Doc("States/Alabama").Set(ctx, State{Population: 5.2}, firestore.Merge([]string{"pop"}))
	if err != nil {
		// TODO: Handle error.
	}
}

func (*DocumentRef) Snapshots 

func (d *DocumentRef) Snapshots(ctx context.Context) *DocumentSnapshotIterator

Snapshots returns an iterator over snapshots of the document. Each time the document changes or is added or deleted, a new snapshot will be generated.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()
	iter := client.Doc("States/Idaho").Snapshots(ctx)
	defer iter.Stop()
	for {
		docsnap, err := iter.Next()
		if err != nil {
			// TODO: Handle error.
		}
		_ = docsnap // TODO: Use DocumentSnapshot.
	}
}

func (*DocumentRef) Update 

func (d *DocumentRef) Update(ctx context.Context, updates []Update, preconds ...Precondition) (_ *WriteResult, err error)

Update updates the document. The values at the given field paths are replaced, but other fields of the stored document are untouched.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	tenn := client.Doc("States/Tennessee")
	wr, err := tenn.Update(ctx, []firestore.Update{
		{Path: "pop", Value: 6.6},
		{FieldPath: []string{".", "*", "/"}, Value: "odd"},
	})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(wr.UpdateTime)
}

func (*DocumentRef) WithReadOptions added in v1.8.0 

func (d *DocumentRef) WithReadOptions(opts ...ReadOption) *DocumentRef

WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.

type DocumentRefIterator 

type DocumentRefIterator struct {
	// contains filtered or unexported fields
}

DocumentRefIterator is an iterator over DocumentRefs.

func (*DocumentRefIterator) GetAll 

func (it *DocumentRefIterator) GetAll() ([]*DocumentRef, error)

GetAll returns all the DocumentRefs remaining from the iterator.

func (*DocumentRefIterator) Next 

func (it *DocumentRefIterator) Next() (*DocumentRef, error)

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

func (*DocumentRefIterator) PageInfo 

func (it *DocumentRefIterator) PageInfo() *iterator.PageInfo

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

type DocumentSnapshot 

type DocumentSnapshot struct {
	// The DocumentRef for this document.
	Ref *DocumentRef

	// Read-only. The time at which the document was created.
	// Increases monotonically when a document is deleted then
	// recreated. It can also be compared to values from other documents and
	// the read time of a query.
	CreateTime time.Time

	// Read-only. The time at which the document was last changed. This value
	// is initially set to CreateTime then increases monotonically with each
	// change to the document. It can also be compared to values from other
	// documents and the read time of a query.
	UpdateTime time.Time

	// Read-only. The time at which the document was read.
	ReadTime time.Time
	// contains filtered or unexported fields
}

A DocumentSnapshot contains document data and metadata.

func (*DocumentSnapshot) Data 

func (d *DocumentSnapshot) Data() map[string]interface{}

Data returns the DocumentSnapshot's fields as a map. It is equivalent to 

var m map[string]interface{}
d.DataTo(&m)

except that it returns nil if the document does not exist.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	docsnap, err := client.Doc("States/Ohio").Get(ctx)
	if err != nil {
		// TODO: Handle error.
	}
	ohioMap := docsnap.Data()
	fmt.Println(ohioMap["capital"])
}

func (*DocumentSnapshot) DataAt 

func (d *DocumentSnapshot) DataAt(path string) (interface{}, error)

DataAt returns the data value denoted by path.

The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". Use DataAtPath instead for such a path.

See DocumentSnapshot.DataTo for how Firestore values are converted to Go values.

If the document does not exist, DataAt returns a NotFound error.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	docsnap, err := client.Doc("States/Ohio").Get(ctx)
	if err != nil {
		// TODO: Handle error.
	}
	cap, err := docsnap.DataAt("capital")
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(cap)
}

func (*DocumentSnapshot) DataAtPath 

func (d *DocumentSnapshot) DataAtPath(fp FieldPath) (interface{}, error)

DataAtPath returns the data value denoted by the FieldPath fp. If the document does not exist, DataAtPath returns a NotFound error.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	docsnap, err := client.Doc("States/Ohio").Get(ctx)
	if err != nil {
		// TODO: Handle error.
	}
	pop, err := docsnap.DataAtPath([]string{"capital", "population"})
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(pop)
}

func (*DocumentSnapshot) DataTo 

func (d *DocumentSnapshot) DataTo(p interface{}) error

DataTo uses the document's fields to populate p, which can be a pointer to a map[string]interface{} or a pointer to a struct.

Firestore field values are converted to Go values as follows:

  • Null converts to nil.
  • Bool converts to bool.
  • String converts to string.
  • Integer converts int64. When setting a struct field, any signed or unsigned integer type is permitted except uint, uint64 or uintptr. Overflow is detected and results in an error.
  • Double converts to float64. When setting a struct field, float32 is permitted. Overflow is detected and results in an error.
  • Bytes is converted to []byte.
  • Timestamp converts to time.Time.
  • GeoPoint converts to *latlng.LatLng, where latlng is the package "google.golang.org/genproto/googleapis/type/latlng".
  • Arrays convert to []interface{}. When setting a struct field, the field may be a slice or array of any type and is populated recursively. Slices are resized to the incoming value's size, while arrays that are too long have excess elements filled with zero values. If the array is too short, excess incoming values will be dropped.
  • Vectors convert to []float64
  • Maps convert to map[string]interface{}. When setting a struct field, maps of key type string and any value type are permitted, and are populated recursively.
  • References are converted to *firestore.DocumentRefs.

Field names given by struct field tags are observed, as described in DocumentRef.Create.

Only the fields actually present in the document are used to populate p. Other fields of p are left unchanged.

If the document does not exist, DataTo returns a NotFound error.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	docsnap, err := client.Doc("States/Ohio").Get(ctx)
	if err != nil {
		// TODO: Handle error.
	}

	type State struct {
		Capital    string  `firestore:"capital"`
		Population float64 `firestore:"pop"` // in millions
	}

	var s State
	if err := docsnap.DataTo(&s); err != nil {
		// TODO: Handle error.
	}
	fmt.Println(s)
}

func (*DocumentSnapshot) Exists 

func (d *DocumentSnapshot) Exists() bool

Exists reports whether the DocumentSnapshot represents an existing document. Even if Exists returns false, the Ref and ReadTime fields of the DocumentSnapshot are valid.

type DocumentSnapshotIterator 

type DocumentSnapshotIterator struct {
	// contains filtered or unexported fields
}

DocumentSnapshotIterator is an iterator over snapshots of a document. Call Next on the iterator to get a snapshot of the document each time it changes. Call Stop on the iterator when done.

For an example, see DocumentRef.Snapshots.

func (*DocumentSnapshotIterator) Next 

func (it *DocumentSnapshotIterator) Next() (*DocumentSnapshot, error)

Next blocks until the document changes, then returns the DocumentSnapshot for the current state of the document. If the document has been deleted, Next returns a DocumentSnapshot whose Exists method returns false.

Next is not expected to return iterator.Done unless it is called after Stop. Rarely, networking issues may also cause iterator.Done to be returned.

func (*DocumentSnapshotIterator) Stop 

func (it *DocumentSnapshotIterator) Stop()

Stop stops receiving snapshots. You should always call Stop when you are done with a DocumentSnapshotIterator, to free up resources. It is not safe to call Stop concurrently with Next.

type DocumentsOption added in v1.22.0 

type DocumentsOption interface {
	StageOption
	// contains filtered or unexported methods
}

DocumentsOption is an option for a Documents pipeline stage.

type EntityFilter added in v1.10.0 

type EntityFilter interface {
	// contains filtered or unexported methods
}

EntityFilter represents a Firestore filter.

type ExecuteOption added in v1.21.0 

type ExecuteOption interface {
	// contains filtered or unexported methods
}

ExecuteOption is an option for executing a pipeline query.

func WithExplainMode added in v1.21.0 

func WithExplainMode(mode ExplainMode) ExecuteOption

WithExplainMode sets the execution mode for pipeline explain.

type ExecutionStats added in v1.17.0 

type ExecutionStats struct {
	// Total number of results returned, including documents, projections,
	// aggregation results, keys.
	ResultsReturned int64
	// Total time to execute the query in the backend.
	ExecutionDuration *time.Duration
	// Total billable read operations.
	ReadOperations int64
	// Debugging statistics from the execution of the query. Note that the
	// debugging stats are subject to change as Firestore evolves. It could
	// include:
	//
	//	{
	//	  "indexes_entries_scanned": "1000",
	//	  "documents_scanned": "20",
	//	  "billing_details" : {
	//	     "documents_billable": "20",
	//	     "index_entries_billable": "1000",
	//	     "min_query_cost": "0"
	//	  }
	//	}
	DebugStats *map[string]any
}

ExecutionStats represents execution statistics for the query.

type ExplainMetrics added in v1.17.0 

type ExplainMetrics struct {

	// Planning phase information for the query.
	PlanSummary *PlanSummary
	// Aggregated stats from the execution of the query. Only present when
	// ExplainOptions.analyze is set to true
	ExecutionStats *ExecutionStats
}

ExplainMetrics represents explain metrics for the query.

type ExplainMode added in v1.21.0 

type ExplainMode string

ExplainMode is the execution mode for pipeline explain. 

const (
	// ExplainModeAnalyze both plans and executes the query.
	ExplainModeAnalyze ExplainMode = "analyze"
)

type ExplainOptions added in v1.17.0 

type ExplainOptions struct {
	// When false (the default), Query Explain plans the query, but skips over the
	// execution stage. This will return planner stage information.
	//
	// When true, Query Explain both plans and executes the query. This returns all
	// the planner information along with statistics from the query execution runtime.
	// This will include the billing information of the query along with system-level
	// insights into the query execution.
	Analyze bool
}

ExplainOptions are Query Explain options. Query Explain allows you to submit Cloud Firestore queries to the backend and receive detailed performance statistics on backend query execution in return.

type ExplainStats added in v1.21.0 

type ExplainStats struct {
	// contains filtered or unexported fields
}

ExplainStats is query explain stats.

Contains all metadata related to pipeline planning and execution, specific contents depend on the supplied pipeline options.

func (*ExplainStats) RawData added in v1.21.0 

func (es *ExplainStats) RawData() (*anypb.Any, error)

RawData returns the explain stats in an encoded proto format, as returned from the Firestore backend. The caller is responsible for unpacking this proto message.

func (*ExplainStats) Text added in v1.21.0 

func (es *ExplainStats) Text() (string, error)

Text returns the explain stats as a string from the Firestore backend. If explain stats were requested with `outputFormat = 'text'`, the string is returned verbatim. If `outputFormat = 'json'`, this returns the explain stats as stringified JSON.

type Expression added in v1.21.0 

type Expression interface {

	// Add creates an expression that adds two expressions together, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Add(other any) Expression
	// Subtract creates an expression that subtracts the right expression from the left expression, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Subtract(other any) Expression
	// Multiply creates an expression that multiplies the left and right expressions, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Multiply(other any) Expression
	// Divide creates an expression that divides the left expression by the right expression, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Divide(other any) Expression
	// Abs creates an expression that is the absolute value of the input field or expression.
	Abs() Expression
	// Floor creates an expression that is the largest integer that isn't less than the input field or expression.
	Floor() Expression
	// Ceil creates an expression that is the smallest integer that isn't less than the input field or expression.
	Ceil() Expression
	// Exp creates an expression that is the Euler's number e raised to the power of the input field or expression.
	Exp() Expression
	// Log creates an expression that is logarithm of the left expression to base as the right expression, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Log(other any) Expression
	// Log10 creates an expression that is the base 10 logarithm of the input field or expression.
	Log10() Expression
	// Ln creates an expression that is the natural logarithm (base e) of the input field or expression.
	Ln() Expression
	// Mod creates an expression that computes the modulo of the left expression by the right expression, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Mod(other any) Expression
	// Pow creates an expression that computes the left expression raised to the power of the right expression, returning it as an Expr.
	//
	// The parameter 'other' can be a numeric constant or a numeric [Expression].
	Pow(other any) Expression
	// Round creates an expression that rounds the input field or expression to nearest integer.
	Round() Expression
	// RoundToPrecision creates an expression that rounds the input field or expression to a specified number of decimal places.
	RoundToPrecision(places any) Expression
	// Trunc creates an expression that truncates a number to an integer.
	Trunc() Expression
	// TruncToPrecision creates an expression that truncates a number to a specified number of decimal places.
	//
	// The parameter 'places' is the number of decimal places to truncate to. It can be an int, int32, int64 or [Expression].
	TruncToPrecision(places any) Expression

	// Sqrt creates an expression that is the square root of the input field or expression.
	Sqrt() Expression
	// Cmp creates an expression that compares two expressions.
	// Returns -1 if left < right, 0 if left == right, and 1 if left > right.
	//
	// The parameter 'other' can be a constant or an [Expression].
	Cmp(other any) Expression

	// Array operations
	// ArrayContains creates a boolean expression that checks if an array contains a specific value.
	//
	// The parameter 'value' can be a constant (e.g., string, int, bool) or an [Expression].
	ArrayContains(value any) BooleanExpression
	// ArrayContainsAll creates a boolean expression that checks if an array contains all the specified values.
	//
	// The parameter 'values' can be a slice of constants (e.g., []string, []int) or an [Expression] that evaluates to an array.
	ArrayContainsAll(values any) BooleanExpression
	// ArrayContainsAny creates a boolean expression that checks if an array contains any of the specified values.
	//
	// The parameter 'values' can be a slice of constants (e.g., []string, []int) or an [Expression] that evaluates to an array.
	ArrayContainsAny(values any) BooleanExpression
	// ArrayLength creates an expression that calculates the length of an array.
	ArrayLength() Expression
	// EqualAny creates a boolean expression that checks if the expression is equal to any of the specified values.
	//
	// The parameter 'values' can be a slice of constants (e.g., []string, []int) or an [Expression] that evaluates to an array.
	EqualAny(values any) BooleanExpression
	// NotEqualAny creates a boolean expression that checks if the expression is not equal to any of the specified values.
	//
	// The parameter 'values' can be a slice of constants (e.g., []string, []int) or an [Expression] that evaluates to an array.
	NotEqualAny(values any) BooleanExpression
	// ArrayGet creates an expression that retrieves an element from an array at a specified index.
	//
	// The parameter 'offset' is the 0-based index of the element to retrieve.
	// It can be an integer constant or an [Expression] that evaluates to an integer.
	ArrayGet(offset any) Expression
	// Offset creates an expression that accesses an element from an array at a specified index.
	//
	// This is a field access function. If the input is not an array, or if the index
	// is out of bounds, it evaluates to an absent value.
	//
	// The parameter 'index' is the 0-based index of the element to retrieve. It can be an int or an [Expression].
	// Supports negative indexing (e.g., -1 returns the last element).
	Offset(index any) Expression
	// ArrayReverse creates an expression that reverses the order of elements in an array.
	ArrayReverse() Expression
	// ArrayConcat creates an expression that concatenates multiple arrays into a single array.
	//
	// The parameter 'otherArrays' can be a mix of array constants (e.g., []string, []int) or [Expression]s that evaluate to arrays.
	ArrayConcat(otherArrays ...any) Expression
	// ArraySum creates an expression that calculates the sum of all elements in a numeric array.
	ArraySum() Expression
	// ArrayMaximum creates an expression that finds the maximum element in a numeric array.
	ArrayMaximum() Expression
	// ArrayMaximumN creates an expression that finds the N maximum elements in an array.
	//
	// The parameter 'n' can be an integer constant or an [Expression] that evaluates to an integer.
	ArrayMaximumN(n any) Expression
	// ArrayMinimum creates an expression that finds the minimum element in a numeric array.
	ArrayMinimum() Expression
	// ArrayMinimumN creates an expression that finds the N minimum elements in an array.
	//
	// The parameter 'n' can be an integer constant or an [Expression] that evaluates to an integer.
	ArrayMinimumN(n any) Expression
	// ArrayFirst creates an expression that returns the first element of an array.
	ArrayFirst() Expression
	// ArrayFirstN creates an expression that returns the first N elements of an array.
	//
	// The parameter 'n' can be an integer constant or an [Expression] that evaluates to an integer.
	ArrayFirstN(n any) Expression
	// ArrayLast creates an expression that returns the last element of an array.
	ArrayLast() Expression
	// ArrayLastN creates an expression that returns the last N elements of an array.
	//
	// The parameter 'n' can be an integer constant or an [Expression] that evaluates to an integer.
	ArrayLastN(n any) Expression
	// ArraySliceToEnd creates an expression that returns a slice of an array starting from the specified offset.
	//
	// The parameter 'offset' is the 0-based index of the first element to include. It can be an int, int32, int64 or [Expression].
	ArraySliceToEnd(offset any) Expression
	// ArraySlice creates an expression that returns a slice of an array starting from the specified offset with a given length.
	//
	// The parameter 'offset' is the 0-based index of the first element to include. It can be an int, int32, int64 or [Expression].
	// The parameter 'length' is the number of elements to include. It can be an int, int32, int64 or [Expression].
	ArraySlice(offset, length any) Expression
	// ReferenceSliceToEnd creates an expression that returns a subset of segments from a document reference.
	//
	// The parameter 'offset' is the 0-based index of the first element to include. It can be an int, int32, int64 or [Expression].
	ReferenceSliceToEnd(offset any) Expression
	// ReferenceSlice creates an expression that returns a subset of segments from a document reference.
	//
	// The parameter 'offset' is the 0-based index of the first element to include. It can be an int, int32, int64 or [Expression].
	// The parameter 'length' is the number of elements to include. It can be an int, int32, int64 or [Expression].
	ReferenceSlice(offset, length any) Expression

	// ArrayIndexOf creates an expression that returns the first index of a search value in an array.
	//
	// The parameter 'search' is the value to search for. It can be a constant or [Expression].
	ArrayIndexOf(search any) Expression
	// ArrayIndexOfAll creates an expression that returns the indices of all occurrences of a search value in an array.
	//
	// The parameter 'search' is the value to search for. It can be a constant or [Expression].
	ArrayIndexOfAll(search any) Expression
	// ArrayLastIndexOf creates an expression that returns the last index of a search value in an array.
	//
	// The parameter 'search' is the value to search for. It can be a constant or [Expression].
	ArrayLastIndexOf(search any) Expression
	// First returns the value of the expression for the first document in the group.
	First() AggregateFunction
	// Last returns the value of the expression for the last document in the group.
	Last() AggregateFunction
	// ArrayAgg returns an array containing all values of the expression when evaluated on each document in the group.
	//
	// If the expression resolves to an absent value, it is converted to NULL.
	// The order of elements in the output array is not stable and shouldn't be relied upon.
	ArrayAgg() AggregateFunction
	// ArrayAggDistinct returns an array containing all distinct values of the expression when evaluated on each document in the group.
	//
	// If the expression resolves to an absent value, it is converted to NULL.
	// The order of elements in the output array is not stable and shouldn't be relied upon.
	ArrayAggDistinct() AggregateFunction
	// ArrayFilter creates an expression for array_filter(array, param, body).
	//
	// The parameter 'param' is the name of the parameter to use in the body expression.
	// The parameter 'body' is the expression to evaluate for each element of the array.
	ArrayFilter(param string, body BooleanExpression) Expression
	// ArrayTransform applies a transformation to each element of an array.
	//
	// The parameter 'param' is the name of the parameter to use in the transform expression.
	// The parameter 'body' is the expression to evaluate for each element of the array.
	ArrayTransform(param string, body Expression) Expression
	// ArrayTransformWithIndex applies a transformation to each element of an array, providing the index.
	//
	// The parameter 'param' is the name of the parameter to use in the transform expression for the element.
	// The parameter 'indexParam' is the name of the parameter to use in the transform expression for the index.
	// The parameter 'body' is the expression to evaluate for each element of the array.
	ArrayTransformWithIndex(param, indexParam string, body Expression) Expression
	// LogicalMaximum returns the maximum value of the expression and the specified values.
	LogicalMaximum(others ...any) Expression
	// LogicalMinimum returns the minimum value of the expression and the specified values.
	LogicalMinimum(others ...any) Expression

	// Timestamp operations
	// TimestampAdd creates an expression that adds a specified amount of time to a timestamp.
	//
	// The parameter 'unit' can be a string constant (e.g.,  "day") or an [Expression] that evaluates to a valid unit string.
	// Valid units include "microsecond", "millisecond", "second", "minute", "hour" and "day".
	// The parameter 'amount' can be an integer constant or an [Expression] that evaluates to an integer.
	TimestampAdd(unit, amount any) Expression
	// TimestampSubtract creates an expression that subtracts a specified amount of time from a timestamp.
	//
	// The parameter 'unit' can be a string constant (e.g.,  "hour") or an [Expression] that evaluates to a valid unit string.
	// Valid units include "microsecond", "millisecond", "second", "minute", "hour" and "day".
	// The parameter 'amount' can be an integer constant or an [Expression] that evaluates to an integer.
	TimestampSubtract(unit, amount any) Expression
	// TimestampTruncate creates an expression that truncates a timestamp to a specified granularity.
	//
	// The parameter 'granularity' can be a string constant (e.g.,  "month") or an [Expression] that evaluates to a valid granularity string.
	// Valid values are "microsecond", "millisecond", "second", "minute", "hour", "day", "week", "week(monday)", "week(tuesday)",
	// "week(wednesday)", "week(thursday)", "week(friday)", "week(saturday)", "week(sunday)", "isoweek", "month", "quarter", "year", and "isoyear".
	TimestampTruncate(granularity any) Expression
	// TimestampTruncateWithTimezone creates an expression that truncates a timestamp to a specified granularity in a given timezone.
	//
	// The parameter 'granularity' can be a string constant (e.g.,  "week") or an [Expression] that evaluates to a valid granularity string.
	// Valid values are "microsecond", "millisecond", "second", "minute", "hour", "day", "week", "week(monday)", "week(tuesday)",
	// "week(wednesday)", "week(thursday)", "week(friday)", "week(saturday)", "week(sunday)", "isoweek", "month", "quarter", "year", and "isoyear".
	// The parameter 'timezone' can be a string constant (e.g., "America/Los_Angeles") or an [Expression] that evaluates to a valid timezone string.
	// Valid values are from the TZ database or in the format "Etc/GMT-1".
	TimestampTruncateWithTimezone(granularity any, timezone any) Expression
	// TimestampToUnixMicros creates an expression that converts a timestamp expression to the number of microseconds since
	// the Unix epoch (1970-01-01 00:00:00 UTC).
	TimestampToUnixMicros() Expression
	// TimestampToUnixMillis creates an expression that converts a timestamp expression to the number of milliseconds since
	// the Unix epoch (1970-01-01 00:00:00 UTC).
	TimestampToUnixMillis() Expression
	// TimestampToUnixSeconds creates an expression that converts a timestamp expression to the number of seconds since
	// the Unix epoch (1970-01-01 00:00:00 UTC).
	TimestampToUnixSeconds() Expression
	// TimestampExtract creates an expression that extracts a part from a timestamp.
	// - part can be a string or an [Expression]. Valid parts include "microsecond", "millisecond", "second", "minute", "hour", "day",
	//   "dayofweek", "dayofyear", "week", "week(monday)", "week(tuesday)", "week(wednesday)", "week(thursday)",
	//   "week(friday)", "week(saturday)", "week(sunday)", "month", "quarter", "year", "isoweek", and "isoyear".
	TimestampExtract(part any) Expression
	// TimestampExtractWithTimezone creates an expression that extracts a part from a timestamp in a given timezone.
	// - timestamp can be a field path string, [FieldPath] or [Expression].
	// - part can be a string or an [Expression]. Valid parts include "microsecond", "millisecond", "second", "minute", "hour", "day",
	//   "dayofweek", "dayofyear", "week", "week(monday)", "week(tuesday)", "week(wednesday)", "week(thursday)",
	//   "week(friday)", "week(saturday)", "week(sunday)", "month", "quarter", "year", "isoweek", and "isoyear".
	// - timezone can be a string or an [Expression].
	TimestampExtractWithTimezone(part, timezone any) Expression
	// TimestampDiff creates an expression that calculates the difference between two timestamps.
	//
	// The parameter 'start' can be a field path string, [FieldPath] or [Expression].
	// The parameter 'unit' can be a string constant (e.g., "day") or an [Expression] that evaluates to a valid unit string.
	TimestampDiff(start, unit any) Expression
	// UnixMicrosToTimestamp creates an expression that converts a Unix timestamp in microseconds to a Firestore timestamp.
	UnixMicrosToTimestamp() Expression
	// UnixMillisToTimestamp creates an expression that converts a Unix timestamp in milliseconds to a Firestore timestamp.
	UnixMillisToTimestamp() Expression
	// UnixSecondsToTimestamp creates an expression that converts a Unix timestamp in seconds to a Firestore timestamp.
	UnixSecondsToTimestamp() Expression

	// Comparison operations
	// Equal creates a boolean expression that checks if the expression is equal to the other value.
	//
	// The parameter 'other' can be a constant (e.g., string, int, bool) or an [Expression].
	Equal(other any) BooleanExpression
	// NotEqual creates a boolean expression that checks if the expression is not equal to the other value.
	//
	// The parameter 'other' can be a constant (e.g., string, int, bool) or an [Expression].
	NotEqual(other any) BooleanExpression
	// GreaterThan creates a boolean expression that checks if the expression is greater than the other value.
	//
	// The parameter 'other' can be a constant (e.g., string, int, bool) or an [Expression].
	GreaterThan(other any) BooleanExpression
	// GreaterThanOrEqual creates a boolean expression that checks if the expression is greater than or equal to the other value.
	//
	// The parameter 'other' can be a constant (e.g., string, int, bool) or an [Expression].
	GreaterThanOrEqual(other any) BooleanExpression
	// LessThan creates a boolean expression that checks if the expression is less than the other value.
	//
	// The parameter 'other' can be a constant (e.g., string, int, bool) or an [Expression].
	LessThan(other any) BooleanExpression
	// LessThanOrEqual creates a boolean expression that checks if the expression is less than or equal to the other value.
	//
	// The parameter 'other' can be a constant (e.g., string, int, bool) or an [Expression].
	LessThanOrEqual(other any) BooleanExpression

	// General functions
	// Length creates an expression that calculates the length of string, array, map or vector.
	Length() Expression
	// Reverse creates an expression that reverses a string, or array.
	Reverse() Expression
	// Concat creates an expression that concatenates expressions together.
	//
	// The parameter 'others' can be a list of constants (e.g., string, int) or [Expression].
	Concat(others ...any) Expression

	// Key functions
	// GetCollectionID creates an expression that returns the ID of the collection that contains the document.
	GetCollectionID() Expression
	// GetDocumentID creates an expression that returns the ID of the document.
	GetDocumentID() Expression
	// GetParent creates an expression that returns the parent document of a document reference.
	GetParent() Expression
	// GetField creates an expression that accesses a field/property of a document field using the provided key.
	//
	// The parameter 'key' can be a string constant or an [Expression] that evaluates to a string.
	GetField(key any) Expression

	// Logical functions
	// IfError creates an expression that evaluates and returns the receiver expression if it does not produce an error;
	// otherwise, it evaluates and returns `catchExprOrValue`.
	//
	// The parameter 'catchExprOrValue' is the expression or value to return if the receiver expression errors.
	IfError(catchExprOrValue any) Expression
	// IsError returns a boolean expression that checks if the expression evaluates to an error.
	IsError() BooleanExpression
	// FieldExists returns a boolean expression that checks if the field exists.
	FieldExists() BooleanExpression
	// IsAbsent returns a boolean expression that checks if the field is absent.
	IsAbsent() BooleanExpression
	// IfAbsent creates an expression that returns a default value if an expression evaluates to an absent value.
	//
	// The parameter 'catchExprOrValue' is the value to return if the expression is absent.
	// It can be a constant or an [Expression].
	IfAbsent(catchExprOrValue any) Expression
	// IfNull creates an expression that returns a default value if an expression evaluates to null.
	//
	// The parameter 'elseValueOrExpr' can be a constant or [Expression].
	IfNull(elseValueOrExpr any) Expression
	// Coalesce returns the first non-null, non-absent argument, without evaluating the rest of the arguments.
	// When all arguments are null or absent, returns the last argument.
	//
	// The parameter 'others' can be a list of constants or [Expression].
	Coalesce(replacement any, others ...any) Expression

	// Object functions
	// MapGet creates an expression that accesses a value from a map (object) field using the provided key.
	//
	// The parameter 'strOrExprkey' is the key to access in the map.
	// It can be a string constant or an [Expression] that evaluates to a string.
	MapGet(strOrExprkey any) Expression
	// MapMerge creates an expression that merges multiple maps into a single map.
	// If multiple maps have the same key, the later value is used.
	//
	// The parameter 'secondMap' is an [Expression] representing the second map.
	// The parameter 'otherMaps' is a list of additional [Expression]s representing maps to merge.
	MapMerge(secondMap Expression, otherMaps ...Expression) Expression
	// MapRemove creates an expression that removes a key from a map.
	//
	// The parameter 'strOrExprkey' is the key to remove from the map.
	// It can be a string constant or an [Expression] that evaluates to a string.
	MapRemove(strOrExprkey any) Expression
	// MapSet creates an expression that updates a map with key-value pairs.
	//
	// The parameter 'keysAndValues' is a list of alternating key and value arguments.
	MapSet(key any, value any, moreKeysAndValues ...any) Expression
	// MapKeys creates an expression that returns the keys of a map as an array.
	MapKeys() Expression
	// MapValues creates an expression that returns the values of a map as an array.
	MapValues() Expression
	// MapEntries creates an expression that returns the entries of a map as an array of key-value maps.
	MapEntries() Expression

	// Aggregators
	// Sum creates an aggregate function that calculates the sum of the expression.
	Sum() AggregateFunction
	// Average creates an aggregate function that calculates the average of the expression.
	Average() AggregateFunction
	// Count creates an aggregate function that counts the number of documents.
	Count() AggregateFunction
	// CountDistinct creates an aggregate function that counts the distinct values of the expression.
	CountDistinct() AggregateFunction
	// Maximum creates an aggregate function that finds the maximum value of the expression.
	Maximum() AggregateFunction
	// Minimum creates an aggregate function that finds the minimum value of the expression.
	Minimum() AggregateFunction

	// Data size functions
	// StorageSize creates an expression that calculates the storage size of a field or [Expression] in bytes.
	StorageSize() Expression

	// String functions
	// ByteLength creates an expression that calculates the length of a string represented by a field or [Expression] in UTF-8
	// bytes.
	ByteLength() Expression
	// CharLength creates an expression that calculates the character length of a string field or expression in UTF8.
	CharLength() Expression
	// EndsWith creates a boolean expression that checks if the string expression ends with the specified suffix.
	//
	// The parameter 'suffix' can be a string constant or an [Expression] that evaluates to a string.
	EndsWith(suffix any) BooleanExpression
	// Like creates a boolean expression that checks if the string expression matches the specified pattern.
	//
	// The parameter 'suffix' can be a string constant or an [Expression] that evaluates to a string.
	Like(suffix any) BooleanExpression
	// RegexContains creates a boolean expression that checks if the string expression contains a match for the specified regex pattern.
	//
	// The parameter 'pattern' can be a string constant or an [Expression] that evaluates to a string.
	RegexContains(pattern any) BooleanExpression
	// RegexFind creates an expression that returns the first substring that matches the specified regex pattern.
	//
	// The parameter 'pattern' can be a string constant or an [Expression] that evaluates to a string.
	RegexFind(pattern any) Expression
	// RegexFindAll creates an expression that returns all substrings that match the specified regex pattern.
	//
	// The parameter 'pattern' can be a string constant or an [Expression] that evaluates to a string.
	RegexFindAll(pattern any) Expression
	// RegexMatch creates a boolean expression that checks if the string expression matches the specified regex pattern.
	//
	// The parameter 'pattern' can be a string constant or an [Expression] that evaluates to a string.
	RegexMatch(pattern any) BooleanExpression
	// StartsWith creates a boolean expression that checks if the string expression starts with the specified prefix.
	//
	// The parameter 'prefix' can be a string constant or an [Expression] that evaluates to a string.
	StartsWith(prefix any) BooleanExpression
	// StringConcat creates an expression that concatenates multiple strings into a single string.
	//
	// The parameter 'otherStrings' can be a mix of string constants or [Expression]s that evaluate to strings.
	StringConcat(otherStrings ...any) Expression
	// StringContains creates a boolean expression that checks if the string expression contains the specified substring.
	//
	// The parameter 'substring' can be a string constant or an [Expression] that evaluates to a string.
	StringContains(substring any) BooleanExpression
	// StringIndexOf creates an expression that returns the index of a search value in a string.
	//
	// The parameter 'search' can be a string constant or an [Expression] that evaluates to a string.
	StringIndexOf(search any) Expression
	// StringRepeat creates an expression that repeats a string a specified number of times.
	//
	// The parameter 'repetition' can be an integer constant or an [Expression] that evaluates to an integer.
	StringRepeat(repetition any) Expression
	// StringReplaceOne creates an expression that replaces the first occurrence of a search value with a replacement value.
	//
	// The parameter 'search' can be a string constant or an [Expression] that evaluates to a string.
	// The parameter 'replacement' can be a string constant or an [Expression] that evaluates to a string.
	StringReplaceOne(search, replacement any) Expression
	// StringReplaceAll creates an expression that replaces all occurrences of a search value with a replacement value.
	//
	// The parameter 'search' can be a string constant or an [Expression] that evaluates to a string.
	// The parameter 'replacement' can be a string constant or an [Expression] that evaluates to a string.
	StringReplaceAll(search, replacement any) Expression
	// StringReverse creates an expression that reverses a string.
	StringReverse() Expression
	// Join creates an expression that joins the elements of a string array into a single string.
	//
	// The parameter 'delimiter' can be a string constant or an [Expression] that evaluates to a string.
	Join(delimiter any) Expression
	// Substring creates an expression that returns a substring of a string.
	//
	// The parameter 'index' is the starting index of the substring.
	// It can be an integer constant or an [Expression] that evaluates to an integer.
	// The parameter 'offset' is the length of the substring.
	// It can be an integer constant or an [Expression] that evaluates to an integer.
	Substring(index, offset any) Expression
	// ToLower creates an expression that converts a string to lowercase.
	ToLower() Expression
	// ToUpper creates an expression that converts a string to uppercase.
	ToUpper() Expression
	// Trim creates an expression that removes leading and trailing whitespace from a string.
	Trim() Expression
	// TrimValue creates an expression that removes leading and trailing whitespace or specified characters from a string.
	TrimValue(valuesToTrim any) Expression
	// LTrim creates an expression that removes leading whitespace from a string.
	LTrim() Expression
	// LTrimValue creates an expression that removes leading whitespace or specified characters from a string.
	LTrimValue(valuesToTrim any) Expression
	// RTrim creates an expression that removes trailing whitespace from a string.
	RTrim() Expression
	// RTrimValue creates an expression that removes trailing whitespace or specified characters from a string.
	RTrimValue(valuesToTrim any) Expression
	// Split creates an expression that splits a string by a delimiter.
	//
	// The parameter 'delimiter' can be a string constant or an [Expression] that evaluates to a string.
	Split(delimiter any) Expression

	// Type creates an expression that returns the type of the expression.
	Type() Expression
	// IsType creates a boolean expression that checks if the expression is of a specific type.
	//
	// The parameter 'dataType' can be one of the following string constants:
	//   "null", "array", "boolean", "bytes", "timestamp", "geo_point", "number",
	//   "int32", "int64", "float64", "decimal128", "map", "reference", "string",
	//   "vector", "max_key", "min_key", "object_id", "regex", "request_timestamp".
	IsType(dataType string) BooleanExpression

	// Vector functions
	// CosineDistance creates an expression that calculates the cosine distance between two vectors.
	//
	// The parameter 'other' can be [Vector32], [Vector64], []float32, []float64 or an [Expression] that evaluates to a vector.
	CosineDistance(other any) Expression
	// DotProduct creates an expression that calculates the dot product of two vectors.
	//
	// The parameter 'other' can be [Vector32], [Vector64], []float32, []float64 or an [Expression] that evaluates to a vector.
	DotProduct(other any) Expression
	// EuclideanDistance creates an expression that calculates the euclidean distance between two vectors.
	//
	// The parameter 'other' can be [Vector32], [Vector64], []float32, []float64 or an [Expression] that evaluates to a vector.
	EuclideanDistance(other any) Expression
	// VectorLength creates an expression that calculates the length of a vector.
	VectorLength() Expression

	// Ordering
	// Ascending creates an ordering expression for ascending order.
	Ascending() Ordering
	// Descending creates an ordering expression for descending order.
	Descending() Ordering

	// GeoDistance creates an expression that evaluates to the distance in meters between the location in the expression and the query location.
	//
	// The parameter 'location' is the query location.
	//
	// Example:
	//
	//	client.Pipeline().Collection("restaurants").
	//		Search(
	//			WithSearchQuery("waffles"),
	//			WithSearchSort(Ascending(FieldOf("location").GeoDistance(&latlng.LatLng{Latitude: 37.0, Longitude: -122.0}))),
	//		)
	//
	// Experimental: Update, Delete and Search stages in pipeline queries are in public preview
	// and are subject to potential breaking changes in future versions,
	// regardless of any other documented package stability guarantees.
	GeoDistance(location *latlng.LatLng) Expression

	// As assigns an alias to an expression.
	// Aliases are useful for renaming fields in the output of a stage.
	As(alias string) *AliasedExpression
	// contains filtered or unexported methods
}

Expression represents an expression that can be evaluated to a value within the execution of a Pipeline.

Expressions are the building blocks for creating complex queries and transformations in Firestore pipelines. They can represent:

- Field references: Access values from document fields. - Literals: Represent constant values (strings, numbers, booleans). - Function calls: Apply functions to one or more expressions. - Aggregations: Calculate aggregate values (e.g., sum, average) using AggregateFunction instances.

The Expression interface provides a fluent API for building expressions. You can chain together method calls to create complex expressions.

func Abs added in v1.21.0 

func Abs(numericExprOrFieldPath any) Expression

Abs creates an expression that is the absolute value of the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func Add added in v1.21.0 

func Add(left, right any) Expression

Add creates an expression that adds two expressions together, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a numeric constant or a numeric Expression.

func Array added in v1.21.0 

func Array(elements ...any) Expression

Array creates an expression that represents a Firestore array. - elements can be any number of values or expressions that will form the elements of the array.

func ArrayConcat added in v1.21.0 

func ArrayConcat(exprOrFieldPath any, otherArrays ...any) Expression

ArrayConcat creates an expression that concatenates multiple arrays into a single array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - otherArrays are the other arrays to concatenate.

func ArrayFilter added in v1.22.0 

func ArrayFilter(array any, param string, body BooleanExpression) Expression

ArrayFilter creates an expression for array_filter(array, param, body). - array can be a field path string, FieldPath or an Expression that evaluates to an array. - param is the name of the parameter to use in the body expression. - body is the expression to evaluate for each element of the array.

func ArrayFirst added in v1.22.0 

func ArrayFirst(exprOrFieldPath any) Expression

ArrayFirst creates an expression that returns the first element of an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array.

func ArrayFirstN added in v1.22.0 

func ArrayFirstN(exprOrFieldPath any, n any) Expression

ArrayFirstN creates an expression that returns the first N elements of an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - n can be an int, int32, int64 or Expression.

func ArrayFromSlice added in v1.21.0 

func ArrayFromSlice[T any](elements []T) Expression

ArrayFromSlice creates a new array expression from a slice of elements. This function is necessary for creating an array from an existing typed slice (e.g., []int), as the Array function (which takes variadic arguments) cannot directly accept a typed slice using the spread operator (...). It handles the conversion of each element to `any` internally.

func ArrayGet added in v1.21.0 

func ArrayGet(exprOrFieldPath any, offset any) Expression

ArrayGet creates an expression that retrieves an element from an array at a specified index.

This is a typed function. It expects the first argument to be an array. If the target is not an array, the query will fail with a type error. If the target is null, the result is null.

For a version that returns an absent value (UNSET) instead of failing on type mismatch, use Offset.

- exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - offset is the 0-based index of the element to retrieve. Supports negative indexing.

func ArrayIndexOf added in v1.22.0 

func ArrayIndexOf(exprOrFieldPath any, search any) Expression

ArrayIndexOf creates an expression that returns the first index of a search value in an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - search is the value to search for. It can be a constant or Expression.

func ArrayIndexOfAll added in v1.22.0 

func ArrayIndexOfAll(exprOrFieldPath any, search any) Expression

ArrayIndexOfAll creates an expression that returns the indices of all occurrences of a search value in an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - search is the value to search for. It can be a constant or Expression.

func ArrayLast added in v1.22.0 

func ArrayLast(exprOrFieldPath any) Expression

ArrayLast creates an expression that returns the last element of an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array.

func ArrayLastIndexOf added in v1.22.0 

func ArrayLastIndexOf(exprOrFieldPath any, search any) Expression

ArrayLastIndexOf creates an expression that returns the last index of a search value in an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - search is the value to search for. It can be a constant or Expression.

func ArrayLastN added in v1.22.0 

func ArrayLastN(exprOrFieldPath any, n any) Expression

ArrayLastN creates an expression that returns the last N elements of an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - n can be an int, int32, int64 or Expression.

func ArrayLength added in v1.21.0 

func ArrayLength(exprOrFieldPath any) Expression

ArrayLength creates an expression that calculates the length of an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array.

func ArrayMaximum added in v1.21.0 

func ArrayMaximum(exprOrFieldPath any) Expression

ArrayMaximum creates an expression that finds the maximum element in a numeric array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a numeric array.

func ArrayMaximumN added in v1.22.0 

func ArrayMaximumN(exprOrFieldPath any, n any) Expression

ArrayMaximumN creates an expression that finds the N maximum elements in an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - n can be an int, int32, int64 or Expression.

func ArrayMinimum added in v1.21.0 

func ArrayMinimum(exprOrFieldPath any) Expression

ArrayMinimum creates an expression that finds the minimum element in a numeric array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a numeric array.

func ArrayMinimumN added in v1.22.0 

func ArrayMinimumN(exprOrFieldPath any, n any) Expression

ArrayMinimumN creates an expression that finds the N minimum elements in an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - n can be an int, int32, int64 or Expression.

func ArrayReverse added in v1.21.0 

func ArrayReverse(exprOrFieldPath any) Expression

ArrayReverse creates an expression that reverses the order of elements in an array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array.

func ArraySlice added in v1.22.0 

func ArraySlice(exprOrFieldPath any, offset any, length any) Expression

ArraySlice creates an expression that returns a slice of an array starting from the specified offset with a given length. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - offset is the 0-based index of the first element to include. It can be an int, int32, int64 or Expression. - length is the number of elements to include. It can be an int, int32, int64 or Expression.

func ArraySliceToEnd added in v1.22.0 

func ArraySliceToEnd(exprOrFieldPath any, offset any) Expression

ArraySliceToEnd creates an expression that returns a slice of an array starting from the specified offset. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array. - offset is the 0-based index of the first element to include. It can be an int, int32, int64 or Expression.

func ArraySum added in v1.21.0 

func ArraySum(exprOrFieldPath any) Expression

ArraySum creates an expression that calculates the sum of all elements in a numeric array. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a numeric array.

func ArrayTransform added in v1.22.0 

func ArrayTransform(array any, param string, body Expression) Expression

ArrayTransform applies a transformation to each element of an array. - array can be a field path string, FieldPath or an Expression that evaluates to an array. - param is the name of the parameter to use in the transform expression. - body is the expression to evaluate for each element of the array.

func ArrayTransformWithIndex added in v1.22.0 

func ArrayTransformWithIndex(array any, param, indexParam string, body Expression) Expression

ArrayTransformWithIndex applies a transformation to each element of an array, providing the index. - array can be a field path string, FieldPath or an Expression that evaluates to an array. - param is the name of the parameter to use in the transform expression for the element. - indexParam is the name of the parameter to use in the transform expression for the index. - body is the expression to evaluate for each element of the array.

func ByteLength added in v1.21.0 

func ByteLength(exprOrFieldPath any) Expression

ByteLength creates an expression that calculates the length of a string represented by a field or Expression in UTF-8 bytes.

func Ceil added in v1.21.0 

func Ceil(numericExprOrFieldPath any) Expression

Ceil creates an expression that is the smallest integer that isn't less than the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func CharLength added in v1.21.0 

func CharLength(exprOrFieldPath any) Expression

CharLength creates an expression that calculates the character length of a string field or expression in UTF8.

func Cmp added in v1.22.0 

func Cmp(left, right any) Expression

Cmp creates an expression that compares the left and right expressions, returning it as an Expr. Returns -1 if left < right, 0 if left == right, and 1 if left > right. - left can be a field path string, FieldPath or Expression. - right can be a constant or an Expression.

func Coalesce added in v1.22.0 

func Coalesce(exprOrField any, replacement any, others ...any) Expression

Coalesce returns the first non-null, non-absent argument, without evaluating the rest of the arguments. When all arguments are null or absent, returns the last argument. - exprOrField can be a field path string, FieldPath or an Expression. - replacement is the fallback expression or value if the first one evaluates to null or is absent. - others are optional additional expressions or values to check.

func Concat added in v1.21.0 

func Concat(exprOrField any, others ...any) Expression

Concat creates an expression that concatenates expressions together. - exprOrField can be a field path string, FieldPath or an Expression. - others can be a list of constants or Expression.

Example: 

// Concat the 'name' field with a constant string.
Concat("name", "-suffix")

func Conditional added in v1.21.0 

func Conditional(condition BooleanExpression, thenValOrExpr, elseValOrExpr any) Expression

Conditional creates an expression that evaluates a condition and returns one of two expressions. - condition is the boolean expression to evaluate. - thenValOrExpr is the value or expression to return if the condition is true. - elseValOrExpr is the value or expression to return if the condition is false.

func ConstantOf added in v1.21.0 

func ConstantOf(value any) Expression

ConstantOf creates a new constant Expression from a Go value. It accepts primitive types (strings, numbers, booleans), slices, arrays, maps, structs, and specific Firestore types such as time.Time, *timestamppb.Timestamp, []byte, Vector32, Vector64, *latlng.LatLng, and *DocumentRef.

func ConstantOfNull added in v1.21.0 

func ConstantOfNull() Expression

ConstantOfNull creates a new constant Expression representing a null value.

func ConstantOfVector32 added in v1.21.0 

func ConstantOfVector32(value []float32) Expression

ConstantOfVector32 creates a new Vector32 constant Expression from a slice of float32s.

func ConstantOfVector64 added in v1.21.0 

func ConstantOfVector64(value []float64) Expression

ConstantOfVector64 creates a new Vector64 constant Expression from a slice of float64s.

func CosineDistance added in v1.21.0 

func CosineDistance(vector1 any, vector2 any) Expression

CosineDistance creates an expression that calculates the cosine distance between two vectors.

func CurrentDocument added in v1.22.0 

func CurrentDocument() Expression

CurrentDocument creates an expression that represents the current document being processed.

This expression is useful when you need to access the entire document as a map, or pass the document itself to a function or subquery.

Example: 

// Define the current document as a variable "doc"
client.Pipeline().Collection("books").
	Define(AliasedExpressions(CurrentDocument().As("doc"))).
	// Access a field from the defined document variable
	Select(Fields(GetField(Variable("doc"), "title")))

func CurrentTimestamp added in v1.21.0 

func CurrentTimestamp() Expression

CurrentTimestamp creates an expression that returns the current timestamp.

func Divide added in v1.21.0 

func Divide(left, right any) Expression

Divide creates an expression that divides the left expression by the right expression, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a numeric constant or a numeric Expression.

func DotProduct added in v1.21.0 

func DotProduct(vector1 any, vector2 any) Expression

DotProduct creates an expression that calculates the dot product of two vectors.

func EuclideanDistance added in v1.21.0 

func EuclideanDistance(vector1 any, vector2 any) Expression

EuclideanDistance creates an expression that calculates the euclidean distance between two vectors.

func Exp added in v1.21.0 

func Exp(numericExprOrFieldPath any) Expression

Exp creates an expression that is the Euler's number e raised to the power of the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func FieldOf added in v1.21.0 

func FieldOf[T string | FieldPath](path T) Expression

FieldOf creates a new field Expression from a dot separated field path string or FieldPath.

func Floor added in v1.21.0 

func Floor(numericExprOrFieldPath any) Expression

Floor creates an expression that is the largest integer that isn't less than the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func GeoDistance added in v1.22.0 

func GeoDistance(field any, location *latlng.LatLng) Expression

GeoDistance creates an expression that evaluates to the distance in meters between the location in the specified field and the query location.

This Expression can only be used within a Search stage.

Example: 

client.Pipeline().Collection("restaurants").
	Search(
		WithSearchQuery("waffles"),
		WithSearchSort(Ascending(GeoDistance("location", &latlng.LatLng{Latitude: 37.0, Longitude: -122.0}))),
	)

- field: Specifies the field in the document which contains the GeoPoint for distance computation. It can be a field path string, FieldPath or Expression. - location: Compute distance to this GeoPoint.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func GetCollectionID added in v1.21.0 

func GetCollectionID(exprOrField any) Expression

GetCollectionID creates an expression that returns the ID of the collection that contains the document. - exprOrField can be a field path string, FieldPath or an Expression that evaluates to a field path.

func GetDocumentID added in v1.21.0 

func GetDocumentID(exprStringOrDocRef any) Expression

GetDocumentID creates an expression that returns the ID of the document. - exprStringOrDocRef can be a string, a DocumentRef, or an Expression that evaluates to a document reference.

func GetField added in v1.22.0 

func GetField(exprOrField any, key any) Expression

GetField creates an expression that accesses a field/property of a document field using the provided key. - exprOrField: The expression representing the document or map. - key: The key of the field to access.

func GetParent added in v1.22.0 

func GetParent(exprStringOrDocRef any) Expression

GetParent creates an expression that returns the parent document of a document reference. - exprStringOrDocRef can be a string representation of the document path, a DocumentRef, or an Expression that evaluates to a document path.

func IfAbsent added in v1.21.0 

func IfAbsent(exprOrField any, elseValueOrExpr any) Expression

IfAbsent creates an expression that returns a default value if an expression evaluates to an absent value. - exprOrField is the field or expression to check. It can be a field path string, FieldPath or an Expression. - elseValueOrExpr is the value or expression to return if the expression is absent. It can be a constant or an Expression.

func IfError added in v1.21.0 

func IfError(tryExpr Expression, catchExprOrValue any) Expression

IfError creates an expression that evaluates and returns `tryExpr` if it does not produce an error; otherwise, it evaluates and returns `catchExprOrValue`. It returns a new Expression representing the if_error operation. - tryExpr is the expression to try. - catchExprOrValue is the expression or value to return if `tryExpr` errors.

func IfNull added in v1.22.0 

func IfNull(exprOrField any, elseValueOrExpr any) Expression

IfNull creates an expression that returns a default value if an expression evaluates to null. Note: This function provides a fallback for both absent and explicit null values. In contrast, IfAbsent only triggers for missing fields. - exprOrField can be a field path string, FieldPath or an Expression. - elseValueOrExpr is the default value or expression to return if the first evaluates to null.

func Join added in v1.21.0 

func Join(exprOrFieldPath any, delimiter any) Expression

Join creates an expression that joins the elements of a string array into a single string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string array. - delimiter is the string to use as a separator between elements.

func LTrim added in v1.22.0 

func LTrim(exprOrFieldPath any) Expression

LTrim creates an expression that removes leading whitespace from a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string.

func LTrimValue added in v1.22.0 

func LTrimValue(exprOrFieldPath any, charsOrExprToTrim any) Expression

LTrimValue creates an expression that removes leading whitespace or specified characters from a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - charsOrExprToTrim is a string or Expression specifying characters to remove.

func Length added in v1.21.0 

func Length(exprOrField any) Expression

Length creates an expression that calculates the length of string, array, map or vector. - exprOrField can be a field path string, FieldPath or an Expression that returns a string, array, map or vector when evaluated.

Example: 

// Length of the 'name' field.
Length("name")

func Ln added in v1.21.0 

func Ln(numericExprOrFieldPath any) Expression

Ln creates an expression that is the natural logarithm (base e) of the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func Log added in v1.21.0 

func Log(left, right any) Expression

Log creates an expression that is logarithm of the left expression to base as the right expression, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a constant or an Expression.

func Log10 added in v1.21.0 

func Log10(numericExprOrFieldPath any) Expression

Log10 creates an expression that is the base 10 logarithm of the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func LogicalMaximum added in v1.21.0 

func LogicalMaximum(exprOrField any, others ...any) Expression

LogicalMaximum creates an expression that evaluates to the maximum value in a list of expressions. - exprOrField can be a field path string, FieldPath or an Expression. - others can be a list of constants or Expression.

func LogicalMinimum added in v1.21.0 

func LogicalMinimum(exprOrField any, others ...any) Expression

LogicalMinimum creates an expression that evaluates to the minimum value in a list of expressions. - exprOrField can be a field path string, FieldPath or an Expression. - others can be a list of constants or Expression.

func Map added in v1.21.0 

func Map(elements map[string]any) Expression

Map creates an expression that creates a Firestore map value from an input object. - elements: The input map to evaluate in the expression.

func MapEntries added in v1.22.0 

func MapEntries(exprOrField any) Expression

MapEntries creates an expression that returns the entries of a map as an array of key-value maps. - exprOrField: The expression representing the map.

func MapGet added in v1.21.0 

func MapGet(exprOrField any, strOrExprkey any) Expression

MapGet creates an expression that accesses a value from a map (object) field using the provided key. - exprOrField: The expression representing the map. - strOrExprkey: The key to access in the map.

func MapKeys added in v1.22.0 

func MapKeys(exprOrField any) Expression

MapKeys creates an expression that returns the keys of a map as an array. - exprOrField: The expression representing the map.

func MapMerge added in v1.21.0 

func MapMerge(exprOrField any, secondMap Expression, otherMaps ...Expression) Expression

MapMerge creates an expression that merges multiple maps into a single map. If multiple maps have the same key, the later value is used. - exprOrField: First map field path string, FieldPath or an Expression - secondMap: Second map expression that will be merged. - otherMaps: Additional maps to merge.

func MapRemove added in v1.21.0 

func MapRemove(exprOrField any, strOrExprkey any) Expression

MapRemove creates an expression that removes a key from a map. - exprOrField: The expression representing the map. - strOrExprkey: The key to remove from the map.

func MapSet added in v1.22.0 

func MapSet(exprOrField any, key any, value any, moreKeysAndValues ...any) Expression

MapSet creates an expression that updates a map with key-value pairs. - exprOrField: The expression representing the map. - key: The first key to set. It can be a string or an Expression. - value: The first value to set. It can be a literal value or an Expression. - moreKeysAndValues: Optional additional alternating key and value arguments.

func MapValues added in v1.22.0 

func MapValues(exprOrField any) Expression

MapValues creates an expression that returns the values of a map as an array. - exprOrField: The expression representing the map.

func Mod added in v1.21.0 

func Mod(left, right any) Expression

Mod creates an expression that computes the modulo of the left expression by the right expression, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a numeric constant or a numeric Expression.

func Multiply added in v1.21.0 

func Multiply(left, right any) Expression

Multiply creates an expression that multiplies the left and right expressions, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a numeric constant or a numeric Expression.

func Offset added in v1.22.0 

func Offset(exprOrFieldPath any, index any) Expression

Offset creates an expression that accesses an element from an array at a specified index.

This is a field access function. If the input is not an array, or if the index is out of bounds, it evaluates to an absent value.

  • exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to an array.
  • index is the 0-based index of the element to retrieve. It can be an int or an Expression. Supports negative indexing (e.g., -1 returns the last element).

func Pow added in v1.21.0 

func Pow(left, right any) Expression

Pow creates an expression that computes the left expression raised to the power of the right expression, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a numeric constant or a numeric Expression.

func RTrim added in v1.22.0 

func RTrim(exprOrFieldPath any) Expression

RTrim creates an expression that removes trailing whitespace from a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string.

func RTrimValue added in v1.22.0 

func RTrimValue(exprOrFieldPath any, charsOrExprToTrim any) Expression

RTrimValue creates an expression that removes trailing whitespace or specified characters from a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - charsOrExprToTrim is a string or Expression specifying characters to remove.

func Rand added in v1.22.0 

func Rand() Expression

Rand returns a pseudo-random floating point number, chosen uniformly between 0.0 (inclusive) and 1.0 (exclusive).

func ReferenceSlice added in v1.22.0 

func ReferenceSlice(exprOrFieldPath any, offset any, length any) Expression

ReferenceSlice creates an expression that returns a subset of segments from a document reference with a given length. - exprOrField can be a field path string, FieldPath or an Expression that evaluates to a document reference. - offset is the 0-based index of the first segment to include. It can be an int, int32, int64 or Expression. - length is the number of segments to include. It can be an int, int32, int64 or Expression.

func ReferenceSliceToEnd added in v1.22.0 

func ReferenceSliceToEnd(exprOrFieldPath any, offset any) Expression

ReferenceSliceToEnd creates an expression that returns a subset of segments from a document reference. - exprOrField can be a field path string, FieldPath or an Expression that evaluates to a document reference. - offset is the 0-based index of the first segment to include. It can be an int, int32, int64 or Expression.

func RegexFind added in v1.22.0 

func RegexFind(exprOrField any, pattern any) Expression

RegexFind creates an expression that returns the first substring that matches the specified regex pattern. - exprOrField: The expression representing the string to search. - pattern is the regular expression to search for. It can be a string or Expression that evaluates to a string.

func RegexFindAll added in v1.22.0 

func RegexFindAll(exprOrField any, pattern any) Expression

RegexFindAll creates an expression that returns all substrings that match the specified regex pattern. - exprOrField: The expression representing the string to search. - pattern is the regular expression to search for. It can be a string or Expression that evaluates to a string.

This expression uses the [RE2](https://github.com/google/re2/wiki/Syntax) regular expression syntax.

func Reverse added in v1.21.0 

func Reverse(exprOrField any) Expression

Reverse creates an expression that reverses a string, or array. - exprOrField can be a field path string, FieldPath or an Expression that returns a string, or array when evaluated.

Example: 

// Reverse the 'name' field.

Reverse("name")

func Round added in v1.21.0 

func Round(numericExprOrFieldPath any) Expression

Round creates an expression that rounds the input field or expression to nearest integer. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func RoundToPrecision added in v1.22.0 

func RoundToPrecision(numericExprOrFieldPath any, places any) Expression

RoundToPrecision creates an expression that rounds a number to a specified number of decimal places. If places is positive, rounds off digits to the right of the decimal point. If places is negative, rounds off digits to the left of the decimal point. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated. - places can be an int, int32, int64 or Expression.

func Score added in v1.22.0 

func Score() Expression

Score creates an expression that evaluates to the search score that reflects the topicality of the document to all of the text predicates (for example: DocumentMatches) in the search query.

This Expression can only be used within a Search stage.

Example: 

client.Pipeline().Collection("restaurants").
	Search(WithSearchQuery("waffles"), WithSearchSort(Descending(Score())))

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func Split added in v1.21.0 

func Split(exprOrFieldPath any, delimiter any) Expression

Split creates an expression that splits a string by a delimiter. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - delimiter is the string to use to split by.

func Sqrt added in v1.21.0 

func Sqrt(numericExprOrFieldPath any) Expression

Sqrt creates an expression that is the square root of the input field or expression. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func StorageSize added in v1.22.0 

func StorageSize(exprOrFieldPath any) Expression

StorageSize creates an expression that calculates the storage size of a field or Expression in bytes.

func StringConcat added in v1.21.0 

func StringConcat(exprOrFieldPath any, otherStrings ...any) Expression

StringConcat creates an expression that concatenates multiple strings into a single string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - otherStrings are optional additional string expressions or string constants to concatenate.

func StringIndexOf added in v1.22.0 

func StringIndexOf(exprOrFieldPath any, search any) Expression

StringIndexOf creates an expression that returns the index of a search value in a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - search is the value to search for. It can be a string or Expression.

func StringRepeat added in v1.22.0 

func StringRepeat(exprOrFieldPath any, repetition any) Expression

StringRepeat creates an expression that repeats a string a specified number of times. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - repetition is the number of times to repeat the string. It can be an int, int32, int64 or Expression.

func StringReplaceAll added in v1.22.0 

func StringReplaceAll(exprOrFieldPath any, search, replacement any) Expression

StringReplaceAll creates an expression that replaces all occurrences of a search value with a replacement value. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - search is the value to search for. It can be a string or Expression. - replacement is the value to replace with. It can be a string or Expression.

func StringReplaceOne added in v1.22.0 

func StringReplaceOne(exprOrFieldPath any, search, replacement any) Expression

StringReplaceOne creates an expression that replaces the first occurrence of a search value with a replacement value. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - search is the value to search for. It can be a string or Expression. - replacement is the value to replace with. It can be a string or Expression.

func StringReverse added in v1.21.0 

func StringReverse(exprOrFieldPath any) Expression

StringReverse creates an expression that reverses a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string.

func Substring added in v1.21.0 

func Substring(exprOrFieldPath any, index any, length any) Expression

Substring creates an expression that returns a substring of a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - index is the starting index of the substring. - length is the length of the substring.

func Subtract added in v1.21.0 

func Subtract(left, right any) Expression

Subtract creates an expression that subtracts the right expression from the left expression, returning it as an Expr. - left can be a field path string, FieldPath or Expression. - right can be a numeric constant or a numeric Expression.

func SwitchOn added in v1.22.0 

func SwitchOn(condition BooleanExpression, result any, others ...any) Expression

SwitchOn creates an expression that evaluates to the result corresponding to the first true condition.

This function behaves like a `switch` statement. It accepts an alternating sequence of conditions and their corresponding results. If an odd number of arguments is provided, the final argument serves as a default fallback result. If no default is provided and no condition evaluates to true, it throws an error.

  • condition: The first condition to check. Must be a BooleanExpression.
  • result: The result to return if the first condition is true. Can be an Expression or a literal value.
  • others: Additional alternating conditions and results, optionally followed by a default fallback value.

Example: 

firestore.SwitchOn(
    firestore.FieldOf("score").GreaterThan(90), "A",
    firestore.FieldOf("score").GreaterThan(80), "B",
    "F", // Default result
)

func TimestampAdd added in v1.21.0 

func TimestampAdd(timestamp, unit, amount any) Expression

TimestampAdd creates an expression that adds a specified amount of time to a timestamp. - timestamp can be a field path string, FieldPath or Expression. - unit can be a string or an Expression. Valid units include "microsecond", "millisecond", "second", "minute", "hour" and "day". - amount can be an int, int32, int64 or Expression.

func TimestampDiff added in v1.22.0 

func TimestampDiff(end, start, unit any) Expression

TimestampDiff creates an expression that calculates the difference between two timestamps. - end can be a field path string, FieldPath or Expression. - start can be a field path string, FieldPath or Expression. - unit can be a string or an Expression. Valid units include "microsecond", "millisecond", "second", "minute", "hour" and "day".

func TimestampExtract added in v1.22.0 

func TimestampExtract(timestamp, part any) Expression

TimestampExtract creates an expression that extracts a part from a timestamp.

  • timestamp can be a field path string, FieldPath or Expression.
  • part can be a string or an Expression. Valid parts include "microsecond", "millisecond", "second", "minute", "hour", "day", "dayofweek", "dayofyear", "week", "week(monday)", "week(tuesday)", "week(wednesday)", "week(thursday)", "week(friday)", "week(saturday)", "week(sunday)", "month", "quarter", "year", "isoweek", and "isoyear".

func TimestampExtractWithTimezone added in v1.22.0 

func TimestampExtractWithTimezone(timestamp, part, timezone any) Expression

TimestampExtractWithTimezone creates an expression that extracts a part from a timestamp in a given timezone.

  • timestamp can be a field path string, FieldPath or Expression.
  • part can be a string or an Expression. Valid parts include "microsecond", "millisecond", "second", "minute", "hour", "day", "dayofweek", "dayofyear", "week", "week(monday)", "week(tuesday)", "week(wednesday)", "week(thursday)", "week(friday)", "week(saturday)", "week(sunday)", "month", "quarter", "year", "isoweek", and "isoyear".
  • timezone can be a string or an Expression.

func TimestampSubtract added in v1.21.0 

func TimestampSubtract(timestamp, unit, amount any) Expression

TimestampSubtract creates an expression that subtracts a specified amount of time from a timestamp. - timestamp can be a field path string, FieldPath or Expression. - unit can be a string or an Expression. Valid units include "microsecond", "millisecond", "second", "minute", "hour" and "day". - amount can be an int, int32, int64 or Expression.

func TimestampToUnixMicros added in v1.21.0 

func TimestampToUnixMicros(timestamp any) Expression

TimestampToUnixMicros creates an expression that converts a timestamp expression to the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC). - timestamp can be a field path string, FieldPath or Expression.

func TimestampToUnixMillis added in v1.21.0 

func TimestampToUnixMillis(timestamp any) Expression

TimestampToUnixMillis creates an expression that converts a timestamp expression to the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC). - timestamp can be a field path string, FieldPath or Expression.

func TimestampToUnixSeconds added in v1.21.0 

func TimestampToUnixSeconds(timestamp any) Expression

TimestampToUnixSeconds creates an expression that converts a timestamp expression to the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC). - timestamp can be a field path string, FieldPath or Expression.

func TimestampTruncate added in v1.21.0 

func TimestampTruncate(timestamp, granularity any) Expression

TimestampTruncate creates an expression that truncates a timestamp to a specified granularity.

  • timestamp can be a field path string, FieldPath or Expression.
  • granularity can be a string or an Expression. Valid values are "microsecond", "millisecond", "second", "minute", "hour", "day", "week", "week(monday)", "week(tuesday)", "week(wednesday)", "week(thursday)", "week(friday)", "week(saturday)", "week(sunday)", "isoweek", "month", "quarter", "year", and "isoyear".

func TimestampTruncateWithTimezone added in v1.21.0 

func TimestampTruncateWithTimezone(timestamp, granularity any, timezone any) Expression

TimestampTruncateWithTimezone creates an expression that truncates a timestamp to a specified granularity in a given timezone.

  • timestamp can be a field path string, FieldPath or Expression.
  • granularity can be a string or an Expression. Valid values are "microsecond", "millisecond", "second", "minute", "hour", "day", "week", "week(monday)", "week(tuesday)", "week(wednesday)", "week(thursday)", "week(friday)", "week(saturday)", "week(sunday)", "isoweek", "month", "quarter", "year", and "isoyear".
  • timezone can be a string or an Expression. Valid values are from the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".

func ToLower added in v1.21.0 

func ToLower(exprOrFieldPath any) Expression

ToLower creates an expression that converts a string to lowercase. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string.

func ToUpper added in v1.21.0 

func ToUpper(exprOrFieldPath any) Expression

ToUpper creates an expression that converts a string to uppercase. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string.

func Trim added in v1.21.0 

func Trim(exprOrFieldPath any) Expression

Trim creates an expression that removes leading and trailing whitespace from a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string.

func TrimValue added in v1.22.0 

func TrimValue(exprOrFieldPath any, charsOrExprToTrim any) Expression

TrimValue creates an expression that removes specified characters from the beginning and end of a string. - exprOrFieldPath can be a field path string, FieldPath or an Expression that evaluates to a string. - charsOrExprToTrim is a string or Expression specifying characters to remove.

func Trunc added in v1.22.0 

func Trunc(numericExprOrFieldPath any) Expression

Trunc creates an expression that truncates a number to an integer. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated.

func TruncToPrecision added in v1.22.0 

func TruncToPrecision(numericExprOrFieldPath any, places any) Expression

TruncToPrecision creates an expression that truncates a number to a specified number of decimal places. - numericExprOrFieldPath can be a field path string, FieldPath or an Expression that returns a number when evaluated. - places can be an int, int32, int64 or Expression.

func Type added in v1.21.0 

func Type(exprOrFieldPath any) Expression

Type creates an expression that returns the type of the expression. - exprOrFieldPath can be a field path string, FieldPath or an Expression.

func UnixMicrosToTimestamp added in v1.21.0 

func UnixMicrosToTimestamp(micros any) Expression

UnixMicrosToTimestamp creates an expression that converts a Unix timestamp in microseconds to a Firestore timestamp. - micros can be a field path string, FieldPath or Expression.

func UnixMillisToTimestamp added in v1.21.0 

func UnixMillisToTimestamp(millis any) Expression

UnixMillisToTimestamp creates an expression that converts a Unix timestamp in milliseconds to a Firestore timestamp. - millis can be a field path string, FieldPath or Expression.

func UnixSecondsToTimestamp added in v1.21.0 

func UnixSecondsToTimestamp(seconds any) Expression

UnixSecondsToTimestamp creates an expression that converts a Unix timestamp in seconds to a Firestore timestamp. - seconds can be a field path string, FieldPath or Expression.

func Variable added in v1.22.0 

func Variable(name string) Expression

Variable creates an expression that retrieves the value of a variable bound via Define.

Example: 

// Define a variable "discountedPrice" and use it in a filter
client.Pipeline().Collection("products").
	Define(AliasedExpressions(Multiply("price", 0.9).As("discountedPrice"))).
	Where(LessThan(Variable("discountedPrice"), 100))

func VectorLength added in v1.21.0 

func VectorLength(exprOrFieldPath any) Expression

VectorLength creates an expression that calculates the length of a vector.

type FieldNotFoundError added in v1.19.0 

type FieldNotFoundError struct {
	Path string
}

FieldNotFoundError is returned by DocumentSnapshot.DataAt and DocumentSnapshot.DataAtPath when the given field does not exist.

func (*FieldNotFoundError) Error added in v1.19.0 

func (e *FieldNotFoundError) Error() string

type FieldPath 

type FieldPath []string

A FieldPath is a non-empty sequence of non-empty fields that reference a value.

A FieldPath value should only be necessary if one of the field names contains one of the runes ".˜*/[]". Most methods accept a simpler form of field path as a string in which the individual fields are separated by dots. For example, 

[]string{"a", "b"}

is equivalent to the string form 

"a.b"

but 

[]string{"*"}

has no equivalent string form.

type FindNearestOption added in v1.22.0 

type FindNearestOption interface {
	StageOption
	// contains filtered or unexported methods
}

FindNearestOption is an option for a FindNearest pipeline stage.

func WithFindNearestDistanceField added in v1.22.0 

func WithFindNearestDistanceField(field string) FindNearestOption

WithFindNearestDistanceField specifies the name of the field to store the calculated distance.

func WithFindNearestLimit added in v1.22.0 

func WithFindNearestLimit(limit int) FindNearestOption

WithFindNearestLimit specifies the maximum number of nearest neighbors to return.

type FindNearestOptions added in v1.16.0 

type FindNearestOptions struct {
	// DistanceThreshold specifies a threshold for which no less similar documents
	// will be returned. The behavior of the specified [DistanceMeasure] will
	// affect the meaning of the distance threshold. Since [DistanceMeasureDotProduct]
	// distances increase when the vectors are more similar, the comparison is inverted.
	// For [DistanceMeasureEuclidean], [DistanceMeasureCosine]: WHERE distance <= distanceThreshold
	// For [DistanceMeasureDotProduct]:                         WHERE distance >= distance_threshold
	DistanceThreshold *float64

	// DistanceResultField specifies name of the document field to output the result of
	// the vector distance calculation.
	// If the field already exists in the document, its value get overwritten with the distance calculation.
	// Otherwise, a new field gets added to the document.
	DistanceResultField string
}

FindNearestOptions are options for a FindNearest vector query.

type FunctionExpression added in v1.21.0 

type FunctionExpression interface {
	Expression
	// contains filtered or unexported methods
}

FunctionExpression represents Firestore Pipeline functions, which can be evaluated within pipeline execution.

type LimitOption added in v1.22.0 

type LimitOption interface {
	StageOption
	// contains filtered or unexported methods
}

LimitOption is an option for a Limit pipeline stage.

type LiteralsOption added in v1.22.0 

type LiteralsOption interface {
	StageOption
	// contains filtered or unexported methods
}

LiteralsOption is an option for a Literals pipeline stage.

type OffsetOption added in v1.22.0 

type OffsetOption interface {
	StageOption
	// contains filtered or unexported methods
}

OffsetOption is an option for an Offset pipeline stage.

type OrFilter added in v1.10.0 

type OrFilter struct {
	Filters []EntityFilter
}

OrFilter represents a union of two or more filters.

type Ordering added in v1.21.0 

type Ordering struct {
	Expr      Expression
	Direction OrderingDirection
}

Ordering specifies the field and direction for sorting.

func Ascending added in v1.21.0 

func Ascending(expr Expression) Ordering

Ascending creates an Ordering for ascending sort direction.

func Descending added in v1.21.0 

func Descending(expr Expression) Ordering

Descending creates an Ordering for descending sort direction.

func Orders added in v1.22.0 

func Orders(o ...Ordering) []Ordering

Orders is a helper function that returns its arguments as a slice of Ordering. It is used to provide variadic-like ergonomics for the Sort pipeline stage.

type OrderingDirection added in v1.21.0 

type OrderingDirection string

OrderingDirection is the sort direction for pipeline result ordering. 

const (
	// OrderingAsc sorts results from smallest to largest.
	OrderingAsc OrderingDirection = OrderingDirection("ascending")

	// OrderingDesc sorts results from largest to smallest.
	OrderingDesc OrderingDirection = OrderingDirection("descending")
)

type Pipeline added in v1.21.0 

type Pipeline struct {
	// contains filtered or unexported fields
}

Pipeline class provides a flexible and expressive framework for building complex data transformation and query pipelines for Firestore.

A pipeline takes data sources, such as Firestore collections or collection groups, and applies a series of stages that are chained together. Each stage takes the output from the previous stage (or the data source) and produces an output for the next stage (or as the final output of the pipeline).

Expressions can be used within each stages to filter and transform data through the stage.

NOTE: The chained stages do not prescribe exactly how Firestore will execute the pipeline. Instead, Firestore only guarantees that the result is the same as if the chained stages were executed in order.

func Subcollection added in v1.22.0 

func Subcollection(path string) *Pipeline

Subcollection creates a new Pipeline that operates on a subcollection of the current document.

This method allows you to start a new pipeline that operates on a subcollection of the current document. It is intended to be used as a subquery.

Note: A pipeline created with `Subcollection` cannot be executed directly using Pipeline.Execute. It must be used within a parent pipeline.

Example: 

client.Pipeline().Collection("books").
	AddFields(Selectables(
		Subcollection("reviews").
			Aggregate(Accumulators(Average("rating").As("avg_rating"))).
			ToScalarExpression().As("average_rating"),
	))

func (*Pipeline) AddFields added in v1.21.0 

func (p *Pipeline) AddFields(fields []Selectable, opts ...AddFieldsOption) *Pipeline

AddFields adds new fields to outputs from previous stages.

This stage allows you to compute values on-the-fly based on existing data from previous stages or constants. You can use this to create new fields or overwrite existing ones (if there is name overlaps).

The added fields are defined using Selectable's. Use Selectables to provide variadic-like ergonomics for the fields argument.

func (*Pipeline) Aggregate added in v1.21.0 

func (p *Pipeline) Aggregate(accumulators []*AliasedAggregate, opts ...AggregateOption) *Pipeline

Aggregate performs aggregation operations on the documents from previous stages. This stage allows you to calculate aggregate values over a set of documents. You define the aggregations to perform using AliasedAggregate expressions which are typically results of calling AggregateFunction.As on AggregateFunction instances. Use Accumulators to provide variadic-like ergonomics for the accumulators argument.

Example: 

client.Pipeline().Collection("users").
	Aggregate(Accumulators(Sum("age").As("age_sum")))

func (*Pipeline) Define added in v1.22.0 

func (p *Pipeline) Define(variables []*AliasedExpression, opts ...DefineOption) *Pipeline

Define defines one or more variables in the pipeline's scope. `Define` is used to bind a value to a variable for internal reuse within the pipeline body (accessed via the Variable function).

This stage is useful for declaring reusable values or intermediate calculations that can be referenced multiple times in later parts of the pipeline, improving readability and maintainability.

Each variable is defined using an AliasedExpression, which pairs an expression with a name (alias).

Example: 

// Define a variable and use it in a filter
client.Pipeline().Collection("products").
	Define(AliasedExpressions(
		Multiply("price", 0.9).As("discountedPrice"),
		Add("stock", 10).As("newStock"),
	)).
	Where(LessThan(Variable("discountedPrice"), 100)).
	Select(Fields("name", Variable("newStock")))

func (*Pipeline) Delete added in v1.22.0 

func (p *Pipeline) Delete(opts ...DeleteOption) *Pipeline

Delete deletes the documents from previous stages.

Example: 

client.Pipeline().Collection("logs").
	Where(Equal("status", "archived")).
	Delete()

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func (*Pipeline) Distinct added in v1.21.0 

func (p *Pipeline) Distinct(fields []any, opts ...DistinctOption) *Pipeline

Distinct removes duplicate documents from the outputs of previous stages.

You can optionally specify fields or Selectable expressions to determine distinctness. If no fields are specified, the entire document is used to determine distinctness. Use Fields to provide variadic-like ergonomics for the fields argument.

func (*Pipeline) Execute added in v1.21.0 

func (p *Pipeline) Execute(ctx context.Context, opts ...ExecuteOption) *PipelineSnapshot

Execute executes the pipeline and returns a snapshot of the results.

func (*Pipeline) FindNearest added in v1.21.0 

func (p *Pipeline) FindNearest(vectorField any, queryVector any, measure PipelineDistanceMeasure, opts ...FindNearestOption) *Pipeline

FindNearest performs vector distance (similarity) search with given parameters to the stage inputs.

This stage adds a "nearest neighbor search" capability to your pipelines. Given a field that stores vectors and a target vector, this stage will identify and return the inputs whose vector field is closest to the target vector.

The vectorField can be a string, a FieldPath or an Expr. The queryVector can be Vector32, Vector64, []float32, or []float64.

func (*Pipeline) Limit added in v1.21.0 

func (p *Pipeline) Limit(limit int, opts ...LimitOption) *Pipeline

Limit limits the maximum number of documents returned by previous stages.

func (*Pipeline) Offset added in v1.21.0 

func (p *Pipeline) Offset(offset int, opts ...OffsetOption) *Pipeline

Offset skips the first `offset` number of documents from the results of previous stages.

This stage is useful for implementing pagination in your pipelines, allowing you to retrieve results in chunks. It is typically used in conjunction with *Pipeline.Limit to control the size of each page.

Example: Retrieve the second page of 20 results 

  client.Pipeline().Collection("books").
	  .Offset(20)   // Skip the first 20 results
	  .Limit(20)    // Take the next 20 results

func (*Pipeline) RawStage added in v1.21.0 

func (p *Pipeline) RawStage(name string, args []any, opts ...StageOption) *Pipeline

RawStage adds a generic stage to the pipeline. This method provides a flexible way to extend the pipeline's functionality by adding custom stages.

Example: 

// Assume we don't have a built-in "where" stage
client.Pipeline().Collection("books").
	RawStage("where", []any{LessThan(FieldOf("published"), 1900)}).
	Select(Fields("title", "author"))

func (*Pipeline) RemoveFields added in v1.21.0 

func (p *Pipeline) RemoveFields(fields []any, opts ...RemoveFieldsOption) *Pipeline

RemoveFields removes fields from outputs from previous stages. fieldpaths can be a string or a FieldPath or an expression obtained by calling FieldOf. Use Fields to provide variadic-like ergonomics for the fields argument.

func (*Pipeline) ReplaceWith added in v1.21.0 

func (p *Pipeline) ReplaceWith(fieldpathOrExpr any, opts ...ReplaceWithOption) *Pipeline

ReplaceWith fully overwrites all fields in a document with those coming from a nested map.

This stage allows you to emit a map value as a document. Each key of the map becomes a field on the document that contains the corresponding value.

Example: 

// Input: { "name": "John Doe Jr.", "parents": { "father": "John Doe Sr.", "mother": "Jane Doe" } }
// Emit parents as document.
client.Pipeline().Collection("people").ReplaceWith("parents")
// Output: { "father": "John Doe Sr.", "mother": "Jane Doe" }

func (*Pipeline) Sample added in v1.21.0 

func (p *Pipeline) Sample(sampler *Sampler, opts ...SampleOption) *Pipeline

Sample performs a pseudo-random sampling of the documents from the previous stage.

This stage will filter documents pseudo-randomly. The behavior is defined by the Sampler. Use WithDocLimit or WithPercentage to create a Sampler.

Example: 

// Sample 10 books, if available.
client.Pipeline().Collection("books").Sample(WithDocLimit(10))

// Sample 50% of books.
client.Pipeline().Collection("books").Sample(WithPercentage(0.5))

func (*Pipeline) Search added in v1.22.0 

func (p *Pipeline) Search(opts ...SearchOption) *Pipeline

Search adds a search stage to the Pipeline. This must be the first stage of the pipeline. A limited set of expressions are supported in the search stage. Use WithSearchQuery to specify the search query.

Example: 

client.Pipeline().Collection("restaurants").Search(
	WithSearchQuery(DocumentMatches("waffles OR pancakes")),
	WithSearchSort(Descending(Score())),
	WithSearchRetrievalDepth(10),
)

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func (*Pipeline) Select added in v1.21.0 

func (p *Pipeline) Select(fields []any, opts ...SelectOption) *Pipeline

Select selects or creates a set of fields from the outputs of previous stages. The selected fields are defined using field path string, FieldPath or Selectable expressions. Selectable expressions can be:

  • Field: References an existing field.
  • Function: Represents the result of a function with an assigned alias name using [FunctionExpression.As].

Use Fields to provide variadic-like ergonomics for the fields argument.

Example: 

	client.Pipeline().Collection("users").Select(Fields("info.email"))
	client.Pipeline().Collection("users").Select(Fields(FieldOf("info.email")))
	client.Pipeline().Collection("users").Select(Fields(FieldOf([]string{"info", "email"})))
	client.Pipeline().Collection("users").Select([]any{"info.email", "name"})
 	client.Pipeline().Collection("users").Select(Fields(Add("age", 5).As("agePlus5")))

func (*Pipeline) Sort added in v1.21.0 

func (p *Pipeline) Sort(orders []Ordering, opts ...SortOption) *Pipeline

Sort sorts the documents by the given fields and directions. Use Orders to provide variadic-like ergonomics for the orders argument.

func (*Pipeline) ToArrayExpression added in v1.22.0 

func (p *Pipeline) ToArrayExpression() Expression

ToArrayExpression converts this Pipeline into an expression that evaluates to an array result.

Example: 

// Embed a subcollection of reviews as an array into each restaurant document
client.Pipeline().Collection("restaurants").
	AddFields(Selectables(
		Subcollection("reviews").
			Select(Fields("reviewer", "rating")).
			ToArrayExpression().As("reviews"),
	))
// Output format:
// [
//   {
//     "name": "The Burger Joint",
//     "reviews": [
//       { "reviewer": "Alice", "rating": 5 },
//       { "reviewer": "Bob", "rating": 4 }
//     ]
//   }
// ]

func (*Pipeline) ToScalarExpression added in v1.22.0 

func (p *Pipeline) ToScalarExpression() Expression

ToScalarExpression converts this Pipeline into an expression that evaluates to a single scalar result. Used for 1:1 lookups or Aggregations when the subquery is expected to return a single value or object.

Example: 

// Calculate average rating for each restaurant using a subquery
client.Pipeline().Collection("restaurants").
	AddFields(Selectables(
		Subcollection("reviews").
			Aggregate(Accumulators(Average("rating").As("avg_score"))).
			ToScalarExpression().As("stats"),
	))
// Output format:
// [
//   {
//     "name": "The Burger Joint",
//     "stats": {
//       "avg_score": 4.8,
//       "review_count": 120
//     }
//   }
// ]

func (*Pipeline) Union added in v1.21.0 

func (p *Pipeline) Union(other *Pipeline, opts ...UnionOption) *Pipeline

Union performs union of all documents from two pipelines, including duplicates.

This stage will pass through documents from previous stage, and also pass through documents from previous stage of the other *Pipeline given in parameter. The order of documents emitted from this stage is undefined.

Example: 

// Emit documents from books collection and magazines collection.
client.Pipeline().Collection("books").
	Union(client.Pipeline().Collection("magazines"))

func (*Pipeline) Unnest added in v1.21.0 

func (p *Pipeline) Unnest(field Selectable, opts ...UnnestOption) *Pipeline

Unnest produces a document for each element in an array field. For each input document, this stage outputs zero or more documents. Each output document is a copy of the input document, but the array field is replaced by an element from the array. The `field` parameter specifies the array field to unnest. It can be a string representing the field path or a Selectable expression. The alias of the selectable will be used as the new field name.

func (*Pipeline) UnnestWithAlias added in v1.21.0 

func (p *Pipeline) UnnestWithAlias(fieldpath any, alias string, opts ...UnnestOption) *Pipeline

UnnestWithAlias produces a document for each element in an array field, with a specified alias for the unnested field. It can optionally take UnnestOptions.

func (*Pipeline) Update added in v1.22.0 

func (p *Pipeline) Update(opts ...UpdateOption) *Pipeline

Update performs an update operation using documents from previous stages.

This method updates the documents in the database based on the data flowing through the pipeline. You can optionally specify a list of Selectable field transformations using WithUpdateTransformations. If no transformations are provided, the entire document flowing from the previous stage is used as the update payload.

Example: 

// In-place update
client.Pipeline().Literals(updateData).Update()

// Update with transformations
client.Pipeline().Collection("books").
	Where(GreaterThan("price", 50)).
	Update(WithUpdateTransformations(ConstantOf("Discounted").As("status")))

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func (*Pipeline) Where added in v1.21.0 

func (p *Pipeline) Where(condition BooleanExpression, opts ...WhereOption) *Pipeline

Where filters the documents from previous stages to only include those matching the specified BooleanExpression.

This stage allows you to apply conditions to the data, similar to a "WHERE" clause in SQL.

func (*Pipeline) WithReadOptions added in v1.21.0 

func (p *Pipeline) WithReadOptions(opts ...ReadOption) *Pipeline

WithReadOptions specifies constraints for accessing documents from the database, such as ReadTime.

type PipelineDistanceMeasure added in v1.21.0 

type PipelineDistanceMeasure string

PipelineDistanceMeasure is the distance measure for find_nearest pipeline stage. 

const (
	// PipelineDistanceMeasureEuclidean is used to measures the Euclidean distance between the vectors.
	PipelineDistanceMeasureEuclidean PipelineDistanceMeasure = "euclidean"
	// PipelineDistanceMeasureCosine compares vectors based on the angle between them.
	PipelineDistanceMeasureCosine PipelineDistanceMeasure = "cosine"
	// PipelineDistanceMeasureDotProduct is similar to cosine but is affected by the magnitude of the vectors.
	PipelineDistanceMeasureDotProduct PipelineDistanceMeasure = "dot_product"
)

type PipelineResult added in v1.21.0 

type PipelineResult struct {
	// contains filtered or unexported fields
}

PipelineResult is a result returned from executing a pipeline.

func (*PipelineResult) CreateTime added in v1.21.0 

func (p *PipelineResult) CreateTime() *time.Time

CreateTime returns the time at which the document was created.

func (*PipelineResult) Data added in v1.21.0 

func (p *PipelineResult) Data() map[string]any

Data returns the PipelineResult's fields as a map. It is equivalent to 

var m map[string]any
p.DataTo(&m)

func (*PipelineResult) DataTo added in v1.21.0 

func (p *PipelineResult) DataTo(v any) error

DataTo uses the PipelineResult's fields to populate v, which can be a pointer to a map[string]any or a pointer to a struct. This is similar to DocumentSnapshot.DataTo

func (*PipelineResult) ExecutionTime added in v1.21.0 

func (p *PipelineResult) ExecutionTime() *time.Time

ExecutionTime returns the time at which the document(s) were read.

func (*PipelineResult) Exists added in v1.21.0 

func (p *PipelineResult) Exists() bool

Exists reports whether the PipelineResult represents an document. Even if Exists returns false, the rest of the fields are valid.

func (*PipelineResult) Ref added in v1.21.0 

func (p *PipelineResult) Ref() *DocumentRef

Ref returns the DocumentRef for this result.

func (*PipelineResult) UpdateTime added in v1.21.0 

func (p *PipelineResult) UpdateTime() *time.Time

UpdateTime returns the time at which the document was last changed.

type PipelineResultIterator added in v1.21.0 

type PipelineResultIterator struct {
	// contains filtered or unexported fields
}

PipelineResultIterator is an iterator over PipelineResults from a pipeline execution.

func (*PipelineResultIterator) GetAll added in v1.21.0 

func (it *PipelineResultIterator) GetAll() ([]*PipelineResult, error)

GetAll returns all the documents remaining from the iterator. It is not necessary to call Stop on the iterator after calling GetAll.

func (*PipelineResultIterator) Next added in v1.21.0 

func (it *PipelineResultIterator) Next() (*PipelineResult, error)

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

func (*PipelineResultIterator) Stop added in v1.21.0 

func (it *PipelineResultIterator) Stop()

Stop stops the iterator, freeing its resources. Always call Stop when you are done with a DocumentIterator. It is not safe to call Stop concurrently with Next.

type PipelineSnapshot added in v1.21.0 

type PipelineSnapshot struct {
	// contains filtered or unexported fields
}

PipelineSnapshot contains zero or more PipelineResult objects representing the documents returned by a pipeline query. It provides methods to iterate over the documents and access metadata about the query results.

func (*PipelineSnapshot) ExecutionTime added in v1.21.0 

func (ps *PipelineSnapshot) ExecutionTime() (*time.Time, error)

ExecutionTime returns the time at which the pipeline was executed. It is available only after the iterator reaches the end.

func (*PipelineSnapshot) ExplainStats added in v1.21.0 

func (ps *PipelineSnapshot) ExplainStats() *ExplainStats

ExplainStats returns stats from query explain. If WithExplainMode was set to [ExplainModeExplain] or left unset, then no stats will be available.

func (*PipelineSnapshot) Results added in v1.21.0 

func (ps *PipelineSnapshot) Results() *PipelineResultIterator

Results returns an iterator over the query results.

type PipelineSource added in v1.21.0 

type PipelineSource struct {
	// contains filtered or unexported fields
}

PipelineSource is a factory for creating Pipeline instances. It is obtained by calling Client.Pipeline.

func (*PipelineSource) Collection added in v1.21.0 

func (ps *PipelineSource) Collection(path string, opts ...CollectionOption) *Pipeline

Collection creates a new Pipeline that operates on the specified Firestore collection.

func (*PipelineSource) CollectionGroup added in v1.21.0 

func (ps *PipelineSource) CollectionGroup(collectionID string, opts ...CollectionGroupOption) *Pipeline

CollectionGroup creates a new Pipeline that operates on all documents in a group of collections that include the given ID, regardless of parent document.

For example, consider: Countries/France/Cities/Paris = {population: 100} Countries/Canada/Cities/Montreal = {population: 90}

CollectionGroup can be used to query across all "Cities" regardless of its parent "Countries".

func (*PipelineSource) CreateFromAggregationQuery added in v1.21.0 

func (ps *PipelineSource) CreateFromAggregationQuery(query *AggregationQuery) *Pipeline

CreateFromAggregationQuery creates a new Pipeline from the given AggregationQuery. Under the hood, this will translate the query semantics (order by document ID, etc.) to an equivalent pipeline.

func (*PipelineSource) CreateFromQuery added in v1.21.0 

func (ps *PipelineSource) CreateFromQuery(query Queryer) *Pipeline

CreateFromQuery creates a new Pipeline from the given Queryer. Under the hood, this will translate the query semantics (order by document ID, etc.) to an equivalent pipeline.

func (*PipelineSource) Database added in v1.21.0 

func (ps *PipelineSource) Database(opts ...DatabaseOption) *Pipeline

Database creates a new Pipeline that operates on all documents in the Firestore database.

func (*PipelineSource) Documents added in v1.21.0 

func (ps *PipelineSource) Documents(refs []*DocumentRef, opts ...DocumentsOption) *Pipeline

Documents creates a new Pipeline that operates on a specific set of Firestore documents.

func (*PipelineSource) Literals added in v1.22.0 

func (ps *PipelineSource) Literals(documents []map[string]any, opts ...LiteralsOption) *Pipeline

Literals creates a new Pipeline that operates on a fixed set of predefined document objects.

type PlanSummary added in v1.17.0 

type PlanSummary struct {
	// The indexes selected for the query. For example:
	//
	//	[
	//	  {"query_scope": "Collection", "properties": "(foo ASC, __name__ ASC)"},
	//	  {"query_scope": "Collection", "properties": "(bar ASC, __name__ ASC)"}
	//	]
	IndexesUsed []*map[string]any
}

PlanSummary represents planning phase information for the query.

type Precondition 

type Precondition interface {
	// contains filtered or unexported methods
}

A Precondition modifies a Firestore update or delete operation. 

var Exists Precondition

Exists is a Precondition that checks for the existence of a resource before writing to it. If the check fails, the write does not occur.

func LastUpdateTime 

func LastUpdateTime(t time.Time) Precondition

LastUpdateTime returns a Precondition that checks that a resource must exist and must have last been updated at the given time. If the check fails, the write does not occur.

type PropertyFilter added in v1.10.0 

type PropertyFilter struct {
	Path     string
	Operator string
	Value    interface{}
}

PropertyFilter represents a filter on single property.

Path can be a single field or a dot-separated sequence of fields denoting property path, and must not contain any of the runes "˜*/[]". Operator must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in".

type PropertyPathFilter added in v1.10.0 

type PropertyPathFilter struct {
	Path     FieldPath
	Operator string
	Value    interface{}
}

PropertyPathFilter represents a filter on single property.

Path can be an array of fields denoting property path. Operator must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in".

type Query 

type Query struct {
	// contains filtered or unexported fields
}

Query represents a Firestore query.

Query values are immutable. Each Query method creates a new Query; it does not modify the old.

func (Query) Deserialize added in v1.6.0 

func (q Query) Deserialize(bytes []byte) (Query, error)

Deserialize takes a slice of bytes holding the wire-format message of RunQueryRequest, the underlying proto message used by Queries. It then populates and returns a Query object that can be used to execute that Query.

func (Query) Documents 

func (q Query) Documents(ctx context.Context) *DocumentIterator

Documents returns an iterator over the query's resulting documents.

Example 
package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	q := client.Collection("States").Select("pop").
		Where("pop", ">", 10).
		OrderBy("pop", firestore.Desc).
		Limit(10)
	iter1 := q.Documents(ctx)
	_ = iter1 // TODO: Use iter1.

	// You can call Documents directly on a CollectionRef as well.
	iter2 := client.Collection("States").Documents(ctx)
	_ = iter2 // TODO: Use iter2.
}
Example (Path_methods)

This example is just like the one above, but illustrates how to use the XXXPath methods of Query for field paths that can't be expressed as a dot-separated string. 

package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	q := client.Collection("Unusual").SelectPaths([]string{"*"}, []string{"[~]"}).
		WherePath([]string{"/"}, ">", 10).
		OrderByPath([]string{"/"}, firestore.Desc).
		Limit(10)
	iter1 := q.Documents(ctx)
	_ = iter1 // TODO: Use iter1.

	// You can call Documents directly on a CollectionRef as well.
	iter2 := client.Collection("States").Documents(ctx)
	_ = iter2 // TODO: Use iter2.
}

func (Query) EndAt 

func (q Query) EndAt(docSnapshotOrFieldValues ...interface{}) Query

EndAt returns a new Query that specifies that results should end at the document with the given field values. See Query.StartAt for more information.

Calling EndAt overrides a previous call to EndAt or EndBefore.

func (Query) EndBefore 

func (q Query) EndBefore(docSnapshotOrFieldValues ...interface{}) Query

EndBefore returns a new Query that specifies that results should end just before the document with the given field values. See Query.StartAt for more information.

Calling EndBefore overrides a previous call to EndAt or EndBefore.

func (Query) FindNearest added in v1.16.0 

func (q Query) FindNearest(vectorField string, queryVector any, limit int, measure DistanceMeasure, options *FindNearestOptions) VectorQuery

FindNearest returns a query that can perform vector distance (similarity) search.

The returned query, when executed, performs a distance search on the specified vectorField against the given queryVector and returns the top documents that are closest to the queryVector according to measure. At most limit documents are returned.

Only documents whose vectorField field is a Vector32 or Vector64 of the same dimension as queryVector participate in the query; all other documents are ignored. In particular, fields of type []float32 or []float64 are ignored.

The vectorField argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]".

The queryVector argument can be any of the following types:

  • []float32
  • []float64
  • Vector32
  • Vector64
Example

This example demonstrates how to use Firestore vector search. It assumes that the database has a collection "descriptions" in which each document has a field of type Vector32 or Vector64 called "Embedding": 

type Description struct {
   // ...
   Embedding firestore.Vector32
}

package main

import (
	"context"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	//
	q := client.Collection("descriptions").
		FindNearest("Embedding", []float32{1, 2, 3}, 5, firestore.DistanceMeasureDotProduct, &firestore.FindNearestOptions{
			DistanceThreshold:   firestore.Ptr(20.0),
			DistanceResultField: "vector_distance",
		})
	iter1 := q.Documents(ctx)
	_ = iter1 // TODO: Use iter1.
}

func (Query) FindNearestPath added in v1.16.0 

func (q Query) FindNearestPath(vectorFieldPath FieldPath, queryVector any, limit int, measure DistanceMeasure, options *FindNearestOptions) VectorQuery

FindNearestPath is like Query.FindNearest but it accepts a FieldPath.

func (Query) Limit 

func (q Query) Limit(n int) Query

Limit returns a new Query that specifies the maximum number of first results to return. It must not be negative.

func (Query) LimitToLast added in v1.3.0 

func (q Query) LimitToLast(n int) Query

LimitToLast returns a new Query that specifies the maximum number of last results to return. It must not be negative.

func (*Query) NewAggregationQuery added in v1.8.0 

func (q *Query) NewAggregationQuery() *AggregationQuery

NewAggregationQuery returns an AggregationQuery with this query as its base query.

func (Query) Offset 

func (q Query) Offset(n int) Query

Offset returns a new Query that specifies the number of initial results to skip. It must not be negative.

func (Query) OrderBy 

func (q Query) OrderBy(path string, dir Direction) Query

OrderBy returns a new Query that specifies the order in which results are returned. A Query can have multiple OrderBy/OrderByPath specifications. OrderBy appends the specification to the list of existing ones.

The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]".

To order by document name, use the special field path DocumentID.

func (Query) OrderByPath 

func (q Query) OrderByPath(fp FieldPath, dir Direction) Query

OrderByPath returns a new Query that specifies the order in which results are returned. A Query can have multiple OrderBy/OrderByPath specifications. OrderByPath appends the specification to the list of existing ones.

func (Query) Pipeline added in v1.21.0 

func (q Query) Pipeline() *Pipeline

Pipeline creates a new Pipeline from the query. All of the operations of the query will be converted to pipeline stages. For example, `query.Where("f", "==", 1).Limit(10).OrderBy("f", Asc).Pipeline()` is equivalent to `client.Pipeline().Collection("C").Where(Equal("f", 1)).Limit(10).Sort(Ascending("f"))`.

func (Query) Select 

func (q Query) Select(paths ...string) Query

Select returns a new Query that specifies the paths to return from the result documents. Each path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]".

An empty Select call will produce a query that returns only document IDs.

func (Query) SelectPaths 

func (q Query) SelectPaths(fieldPaths ...FieldPath) Query

SelectPaths returns a new Query that specifies the field paths to return from the result documents.

An empty SelectPaths call will produce a query that returns only document IDs.

func (Query) Serialize added in v1.6.0 

func (q Query) Serialize() ([]byte, error)

Serialize creates a RunQueryRequest wire-format byte slice from a Query object. This can be used in combination with Deserialize to marshal Query objects. This could be useful, for instance, if executing a query formed in one process in another.

func (Query) Snapshots 

func (q Query) Snapshots(ctx context.Context) *QuerySnapshotIterator

Snapshots returns an iterator over snapshots of the query. Each time the query results change, a new snapshot will be generated.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
	"google.golang.org/api/iterator"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	q := client.Collection("States").
		Where("pop", ">", 10).
		OrderBy("pop", firestore.Desc).
		Limit(10)
	qsnapIter := q.Snapshots(ctx)
	// Listen forever for changes to the query's results.
	for {
		qsnap, err := qsnapIter.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			// TODO: Handle error.
		}
		fmt.Printf("At %s there were %d results.\n", qsnap.ReadTime, qsnap.Size)
		_ = qsnap.Documents // TODO: Iterate over the results if desired.
		_ = qsnap.Changes   // TODO: Use the list of incremental changes if desired.
	}
}

func (Query) StartAfter 

func (q Query) StartAfter(docSnapshotOrFieldValues ...interface{}) Query

StartAfter returns a new Query that specifies that results should start just after the document with the given field values. See Query.StartAt for more information.

Calling StartAfter overrides a previous call to StartAt or StartAfter.

func (Query) StartAt 

func (q Query) StartAt(docSnapshotOrFieldValues ...interface{}) Query

StartAt returns a new Query that specifies that results should start at the document with the given field values.

StartAt may be called with a single DocumentSnapshot, representing an existing document within the query. The document must be a direct child of the location being queried (not a parent document, or document in a different collection, or a grandchild document, for example).

Otherwise, StartAt should be called with one field value for each OrderBy clause, in the order that they appear. For example, in 

q.OrderBy("X", Asc).OrderBy("Y", Desc).StartAt(1, 2)

results will begin at the first document where X = 1 and Y = 2.

If an OrderBy call uses the special DocumentID field path, the corresponding value should be the document ID relative to the query's collection. For example, to start at the document "NewYork" in the "States" collection, write 

client.Collection("States").OrderBy(DocumentID, firestore.Asc).StartAt("NewYork")

Calling StartAt overrides a previous call to StartAt or StartAfter.

func (Query) Where 

func (q Query) Where(path, op string, value interface{}) Query

Where returns a new Query that filters the set of results. A Query can have multiple filters. The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". The op argument must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in". WARNING: Using WhereEntity with Simple and Composite filters is recommended.

func (Query) WhereEntity added in v1.10.0 

func (q Query) WhereEntity(ef EntityFilter) Query

WhereEntity returns a query with provided filter.

EntityFilter can be a simple filter or a composite filter PropertyFilter and PropertyPathFilter are supported simple filters AndFilter and OrFilter are supported composite filters Entity filters in multiple calls are joined together by AND

func (Query) WherePath 

func (q Query) WherePath(fp FieldPath, op string, value interface{}) Query

WherePath returns a new Query that filters the set of results. A Query can have multiple filters. The op argument must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in". WARNING: Using WhereEntity with Simple and Composite filters is recommended.

func (*Query) WithReadOptions added in v1.8.0 

func (q *Query) WithReadOptions(opts ...ReadOption) *Query

WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.

func (Query) WithRunOptions added in v1.17.0 

func (q Query) WithRunOptions(opts ...RunOption) Query

WithRunOptions allows passing options to the query Calling WithRunOptions overrides a previous call to WithRunOptions.

type QuerySnapshot 

type QuerySnapshot struct {
	// An iterator over the query results.
	// It is not necessary to call Stop on this iterator.
	Documents *DocumentIterator

	// The number of results in this snapshot.
	Size int

	// The changes since the previous snapshot.
	Changes []DocumentChange

	// The time at which this snapshot was obtained from Firestore.
	ReadTime time.Time
}

A QuerySnapshot is a snapshot of query results. It is returned by QuerySnapshotIterator.Next whenever the results of a query change.

type QuerySnapshotIterator 

type QuerySnapshotIterator struct {
	// The Query used to construct this iterator.
	Query Query
	// contains filtered or unexported fields
}

QuerySnapshotIterator is an iterator over snapshots of a query. Call Next on the iterator to get a snapshot of the query's results each time they change. Call Stop on the iterator when done.

For an example, see Query.Snapshots.

func (*QuerySnapshotIterator) Next 

func (it *QuerySnapshotIterator) Next() (*QuerySnapshot, error)

Next blocks until the query's results change, then returns a QuerySnapshot for the current results.

Next is not expected to return iterator.Done unless it is called after Stop. Rarely, networking issues may also cause iterator.Done to be returned.

func (*QuerySnapshotIterator) Stop 

func (it *QuerySnapshotIterator) Stop()

Stop stops receiving snapshots. You should always call Stop when you are done with a QuerySnapshotIterator, to free up resources. It is not safe to call Stop concurrently with Next.

type Queryer 

type Queryer interface {
	// contains filtered or unexported methods
}

A Queryer is a Query or a CollectionRef. CollectionRefs act as queries whose results are all the documents in the collection.

type RawOptions added in v1.22.0 

type RawOptions map[string]any

RawOptions specifies raw options to be passed to the Firestore backend. These options are not validated by the SDK and are passed directly to the backend. Options specified here will take precedence over any options with the same name set by the SDK.

type ReadOption added in v1.8.0 

type ReadOption interface {
	// contains filtered or unexported methods
}

ReadOption interface allows for abstraction of computing read time settings.

func ReadTime added in v1.8.0 

func ReadTime(t time.Time) ReadOption

ReadTime specifies a time-specific snapshot of the database to read.

type RemoveFieldsOption added in v1.22.0 

type RemoveFieldsOption interface {
	StageOption
	// contains filtered or unexported methods
}

RemoveFieldsOption is an option for an RemoveFields pipeline stage.

type ReplaceWithOption added in v1.22.0 

type ReplaceWithOption interface {
	StageOption
	// contains filtered or unexported methods
}

ReplaceWithOption is an option for a ReplaceWith pipeline stage.

type RunOption added in v1.17.0 

type RunOption interface {
	// contains filtered or unexported methods
}

RunOption are options used while running a query

type SampleMode added in v1.21.0 

type SampleMode string

SampleMode defines the mode for the sample stage. 

const (
	// SampleModeDocuments samples a fixed number of documents.
	SampleModeDocuments SampleMode = "documents"
	// SampleModePercent samples a percentage of documents.
	SampleModePercent SampleMode = "percent"
)

type SampleOption added in v1.22.0 

type SampleOption interface {
	StageOption
	// contains filtered or unexported methods
}

SampleOption is an option for a Sample pipeline stage.

type Sampler added in v1.22.0 

type Sampler struct {
	Size any
	Mode SampleMode
}

Sampler is used to define a sample operation.

func WithDocLimit added in v1.22.0 

func WithDocLimit(limit int) *Sampler

WithDocLimit creates a Sampler for sampling a fixed number of documents.

func WithPercentage added in v1.22.0 

func WithPercentage(percentage float64) *Sampler

WithPercentage creates a Sampler for sampling a percentage of documents.

type SearchOption added in v1.22.0 

type SearchOption interface {
	StageOption
	// contains filtered or unexported methods
}

SearchOption is an option for a Search pipeline stage.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func WithSearchAddFields added in v1.22.0 

func WithSearchAddFields(fields ...Selectable) SearchOption

WithSearchAddFields specifies the fields to add to each document.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func WithSearchQuery added in v1.22.0 

func WithSearchQuery(query any) SearchOption

WithSearchQuery specifies the search query that will be used to query and score documents by the search stage. It can be a string (automatically wrapped in DocumentMatches) or a BooleanExpression.

Example: 

client.Pipeline().Collection("restaurants").Search(
	WithSearchQuery("waffles"),
)

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func WithSearchRetrievalDepth added in v1.22.0 

func WithSearchRetrievalDepth(depth int64) SearchOption

WithSearchRetrievalDepth specifies the maximum number of documents to retrieve. Documents will be retrieved in the pre-sort order specified by the search index.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func WithSearchSort added in v1.22.0 

func WithSearchSort(orders ...Ordering) SearchOption

WithSearchSort specifies how the returned documents are sorted. One or more ordering are required.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

type SelectOption added in v1.22.0 

type SelectOption interface {
	StageOption
	// contains filtered or unexported methods
}

SelectOption is an option for a Select pipeline stage.

type Selectable added in v1.21.0 

type Selectable interface {
	// contains filtered or unexported methods
}

Selectable is an interface for expressions that can be selected in a pipeline.

func Selectables added in v1.22.0 

func Selectables(s ...Selectable) []Selectable

Selectables is a helper function that returns its arguments as a slice of Selectable. It is used to provide variadic-like ergonomics for pipeline stages that accept a slice of Selectable expressions.

type SetOption 

type SetOption interface {
	// contains filtered or unexported methods
}

A SetOption modifies a Firestore set operation. 

var MergeAll SetOption = merge{/* contains filtered or unexported fields */}

MergeAll is a SetOption that causes all the field paths given in the data argument to Set to be overwritten. It is not supported for struct data.

func Merge 

func Merge(fps ...FieldPath) SetOption

Merge returns a SetOption that causes only the given field paths to be overwritten. Other fields on the existing document will be untouched. It is an error if a provided field path does not refer to a value in the data passed to Set.

type SimpleFilter added in v1.10.0 

type SimpleFilter interface {
	EntityFilter
	// contains filtered or unexported methods
}

SimpleFilter represents a simple Firestore filter.

type SortOption added in v1.22.0 

type SortOption interface {
	StageOption
	// contains filtered or unexported methods
}

SortOption is an option for a Sort pipeline stage.

type StageOption added in v1.22.0 

type StageOption interface {
	// contains filtered or unexported methods
}

StageOption is an option for configuring a pipeline stage.

type Transaction 

type Transaction struct {
	// contains filtered or unexported fields
}

Transaction represents a Firestore transaction.

func (*Transaction) Create 

func (t *Transaction) Create(dr *DocumentRef, data interface{}) error

Create adds a Create operation to the Transaction. See DocumentRef.Create for details.

func (*Transaction) Delete 

func (t *Transaction) Delete(dr *DocumentRef, opts ...Precondition) error

Delete adds a Delete operation to the Transaction. See DocumentRef.Delete for details.

func (*Transaction) DocumentRefs 

func (t *Transaction) DocumentRefs(cr *CollectionRef) *DocumentRefIterator

DocumentRefs returns references to all the documents in the collection, including missing documents. A missing document is a document that does not exist but has sub-documents.

func (*Transaction) Documents 

func (t *Transaction) Documents(q Queryer) *DocumentIterator

Documents returns a DocumentIterator based on given Query or CollectionRef. The results will be in the context of the transaction.

func (*Transaction) Execute added in v1.21.0 

func (t *Transaction) Execute(p *Pipeline, opts ...ExecuteOption) *PipelineSnapshot

Execute runs the given pipeline in the context of the transaction.

func (*Transaction) Get 

func (t *Transaction) Get(dr *DocumentRef) (*DocumentSnapshot, error)

Get gets the document in the context of the transaction. The transaction holds a pessimistic lock on the returned document. If the document does not exist, Get returns a NotFound error, which can be checked with 

status.Code(err) == codes.NotFound

func (*Transaction) GetAll 

func (t *Transaction) GetAll(drs []*DocumentRef) ([]*DocumentSnapshot, error)

GetAll retrieves multiple documents with a single call. The DocumentSnapshots are returned in the order of the given DocumentRefs. If a document is not present, the corresponding DocumentSnapshot's Exists method will return false. The transaction holds a pessimistic lock on all of the returned documents.

func (*Transaction) Set 

func (t *Transaction) Set(dr *DocumentRef, data interface{}, opts ...SetOption) error

Set adds a Set operation to the Transaction. See DocumentRef.Set for details.

func (*Transaction) Update 

func (t *Transaction) Update(dr *DocumentRef, data []Update, opts ...Precondition) error

Update adds a new Update operation to the Transaction. See DocumentRef.Update for details.

func (*Transaction) WithReadOptions added in v1.8.0 

func (t *Transaction) WithReadOptions(opts ...ReadOption) *Transaction

WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.

type TransactionOption 

type TransactionOption interface {
	// contains filtered or unexported methods
}

A TransactionOption is an option passed to Client.Transaction.

type UnionOption added in v1.22.0 

type UnionOption interface {
	StageOption
	// contains filtered or unexported methods
}

UnionOption is an option for a Union pipeline stage.

type UnnestOption added in v1.22.0 

type UnnestOption interface {
	StageOption
	// contains filtered or unexported methods
}

UnnestOption is an option for executing a pipeline unnest stage.

func WithUnnestIndexField added in v1.22.0 

func WithUnnestIndexField(indexField any) UnnestOption

WithUnnestIndexField specifies the name of the field to store the array index of the unnested element.

type Update 

type Update struct {
	Path      string // Will be split on dots, and must not contain any of "˜*/[]".
	FieldPath FieldPath
	Value     interface{}
}

An Update describes an update to a value referred to by a path. An Update should have either a non-empty Path or a non-empty FieldPath, but not both.

See DocumentRef.Create for acceptable values. To delete a field, specify firestore.Delete as the value.

func (Update) String added in v1.18.0 

func (u Update) String() string

String returns string representation of firestore.Update

type UpdateOption added in v1.22.0 

type UpdateOption interface {
	StageOption
	// contains filtered or unexported methods
}

UpdateOption is an option for an Update pipeline stage.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

func WithUpdateTransformations added in v1.22.0 

func WithUpdateTransformations(field Selectable, additionalFields ...Selectable) UpdateOption

WithUpdateTransformations specifies the list of field transformations to apply in an update operation.

Experimental: Update, Delete and Search stages in pipeline queries are in public preview and are subject to potential breaking changes in future versions, regardless of any other documented package stability guarantees.

type Vector32 added in v1.16.0 

type Vector32 []float32

Vector32 is an embedding vector of float32s.

type Vector64 added in v1.16.0 

type Vector64 []float64

Vector64 is an embedding vector of float64s.

type VectorQuery added in v1.16.0 

type VectorQuery struct {
	// contains filtered or unexported fields
}

VectorQuery represents a query that uses Query.FindNearest or Query.FindNearestPath.

func (VectorQuery) Documents added in v1.16.0 

func (vq VectorQuery) Documents(ctx context.Context) *DocumentIterator

Documents returns an iterator over the vector query's resulting documents.

type WhereOption added in v1.22.0 

type WhereOption interface {
	StageOption
	// contains filtered or unexported methods
}

WhereOption is an option for a Where pipeline stage.

type WriteBatch deprecated 

type WriteBatch struct {
	// contains filtered or unexported fields
}

A WriteBatch holds multiple database updates. Build a batch with the Create, Set, Update and Delete methods, then run it with the Commit method. Errors in Create, Set, Update or Delete are recorded instead of being returned immediately. The first such error is returned by Commit.

Deprecated: The WriteBatch API has been replaced with the transaction and the bulk writer API. For atomic transaction operations, use `Transaction`. For bulk read and write operations, use `BulkWriter`.

func (*WriteBatch) Commit 

func (b *WriteBatch) Commit(ctx context.Context) (_ []*WriteResult, err error)

Commit applies all the writes in the batch to the database atomically. Commit returns an error if there are no writes in the batch, if any errors occurred in constructing the writes, or if the Commmit operation fails.

Example 
package main

import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

func main() {
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	defer client.Close()

	type State struct {
		Capital    string  `firestore:"capital"`
		Population float64 `firestore:"pop"` // in millions
	}

	ny := client.Doc("States/NewYork")
	ca := client.Doc("States/California")

	writeResults, err := client.Batch().
		Create(ny, State{Capital: "Albany", Population: 19.8}).
		Set(ca, State{Capital: "Sacramento", Population: 39.14}).
		Delete(client.Doc("States/WestDakota")).
		Commit(ctx)
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(writeResults)
}

func (*WriteBatch) Create 

func (b *WriteBatch) Create(dr *DocumentRef, data interface{}) *WriteBatch

Create adds a Create operation to the batch. See DocumentRef.Create for details.

func (*WriteBatch) Delete 

func (b *WriteBatch) Delete(dr *DocumentRef, opts ...Precondition) *WriteBatch

Delete adds a Delete operation to the batch. See DocumentRef.Delete for details.

func (*WriteBatch) Set 

func (b *WriteBatch) Set(dr *DocumentRef, data interface{}, opts ...SetOption) *WriteBatch

Set adds a Set operation to the batch. See DocumentRef.Set for details.

func (*WriteBatch) Update 

func (b *WriteBatch) Update(dr *DocumentRef, data []Update, opts ...Precondition) *WriteBatch

Update adds an Update operation to the batch. See DocumentRef.Update for details.

type WriteResult 

type WriteResult struct {
	// The time at which the document was updated, or created if it did not
	// previously exist. Writes that do not actually change the document do
	// not change the update time.
	UpdateTime time.Time
}

A WriteResult is returned by methods that write documents.

Source Files

View all Source files

Directories

Path Synopsis
Package firestore is an auto-generated package for the Cloud Firestore API.
 Package firestore is an auto-generated package for the Cloud Firestore API.
admin
Package apiv1 is an auto-generated package for the Cloud Firestore API.
 Package apiv1 is an auto-generated package for the Cloud Firestore API.
admin/adminpb
firestorepb
conformance

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