gorm_generics

package module
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 Go to latest Published: Dec 18, 2023 License: MIT Imports: 5 Imported by: 0

README

PoC for Go generics with GORM

Contributor Covenant

Introduction

This repository represents a small PoC for using Go generics together with GORM, an Object-relational mapping library for Golang.

At this stage it emphasizes possibilities, and it is not stable implementation. In this stage, it is not meant to be used for production system.

Future development is the intention for this project, and any contribution is more than welcome.

TODO: Improve the interface for only specifying a Model and the DTO in generated automatically. https://github.com/viant/xunsafe

Example

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/adderly/gorm-generics"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

// Product is a domain entity
type Product struct {
	ID          uint
	Name        string
	Weight      uint
	IsAvailable bool
}

// ProductGorm is DTO used to map Product entity to database
type ProductGorm struct {
	ID          uint   `gorm:"primaryKey;column:id"`
	Name        string `gorm:"column:name"`
	Weight      uint   `gorm:"column:weight"`
	IsAvailable bool   `gorm:"column:is_available"`
}

// ToEntity respects the gorm_generics.GormModel interface
// Creates new Entity from GORM model.
func (g ProductGorm) ToEntity() Product {
	return Product{
		ID:          g.ID,
		Name:        g.Name,
		Weight:      g.Weight,
		IsAvailable: g.IsAvailable,
	}
}

// FromEntity respects the gorm_generics.GormModel interface
// Creates new GORM model from Entity.
func (g ProductGorm) FromEntity(product Product) interface{} {
	return ProductGorm{
		ID:          product.ID,
		Name:        product.Name,
		Weight:      product.Weight,
		IsAvailable: product.IsAvailable,
	}
}

func main() {
	db, err := gorm.Open(sqlite.Open("file:test?mode=memory&cache=shared&_fk=1"), &gorm.Config{})
	if err != nil {
		log.Fatal(err)
	}

	err = db.AutoMigrate(ProductGorm{})
	if err != nil {
		log.Fatal(err)
	}

	repository := gorm_generics.NewRepository[ProductGorm, Product](db)

	ctx := context.Background()

	product := Product{
		Name:        "product1",
		Weight:      100,
		IsAvailable: true,
	}
	err = repository.Insert(ctx, &product)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(product)
	// Out:
	// {1 product1 100 true}

	single, err := repository.FindByID(ctx, product.ID)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(single)
	// Out:
	// {1 product1 100 true}

	err = repository.Insert(ctx, &Product{
		Name:        "product2",
		Weight:      50,
		IsAvailable: true,
	})
	if err != nil {
		log.Fatal(err)
	}

	many, err := repository.Find(ctx, gorm_generics.GreaterOrEqual("weight", 50))
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(many)
	// Out:
	// [{1 product1 100 true} {2 product2 50 true}]

	err = repository.Insert(ctx, &Product{
		Name:        "product3",
		Weight:      250,
		IsAvailable: false,
	})
	if err != nil {
		log.Fatal(err)
	}

	many, err = repository.Find(ctx, gorm_generics.GreaterOrEqual("weight", 90))
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(many)
	// Out:
	// [{1 product1 100 true} {3 product3 250 false}]

	many, err = repository.Find(ctx, gorm_generics.And(
		gorm_generics.GreaterOrEqual("weight", 90),
		gorm_generics.Equal("is_available", true)),
	)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(many)
	// Out:
	// [{1 product1 100 true}]
}

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func ChunkSlice 

func ChunkSlice[T any](slice []T, chunkSize int) [][]T

func Map 

func Map[T, U any](ts []T, f func(T) U) []U

Maps a type to another using a function for transforming the data

func MapDto 

func MapDto[M GormModel[E], E any, T any](modelArray []M, dtoType T) []T

Types

type GormModel 

type GormModel[E any] interface {
	ToEntity() E
	FromEntity(entity E) interface{}
}

type GormRepository 

type GormRepository[M GormModel[E], E any] struct {
	// contains filtered or unexported fields
}

func NewRepository 

func NewRepository[M GormModel[E], E any](db *gorm.DB) *GormRepository[M, E]

func (*GormRepository[M, E]) Count 

func (r *GormRepository[M, E]) Count(ctx context.Context, specifications ...Specification) (i int64, err error)

func (*GormRepository[M, E]) Delete 

func (r *GormRepository[M, E]) Delete(ctx context.Context, entity *E) error

func (*GormRepository[M, E]) DeleteById 

func (r *GormRepository[M, E]) DeleteById(ctx context.Context, id any) error

func (*GormRepository[M, E]) Find 

func (r *GormRepository[M, E]) Find(ctx context.Context, specifications ...Specification) ([]E, error)

func (*GormRepository[M, E]) FindAll 

func (r *GormRepository[M, E]) FindAll(ctx context.Context) ([]E, error)

func (*GormRepository[M, E]) FindByEntity 

func (r *GormRepository[M, E]) FindByEntity(ctx context.Context, e any) ([]E, error)

func (*GormRepository[M, E]) FindByEntityWithOptions 

func (r *GormRepository[M, E]) FindByEntityWithOptions(ctx context.Context, e any, eagerLoad bool) ([]E, error)

func (*GormRepository[M, E]) FindByID 

func (r *GormRepository[M, E]) FindByID(ctx context.Context, id any) (E, error)

func (*GormRepository[M, E]) FindByIDWithOptions 

func (r *GormRepository[M, E]) FindByIDWithOptions(ctx context.Context, id any, eagerLoad bool) (E, error)

func (*GormRepository[M, E]) FindByModel 

func (r *GormRepository[M, E]) FindByModel(ctx context.Context, entity *M) (M, error)

func (*GormRepository[M, E]) FindByModelMulti 

func (r *GormRepository[M, E]) FindByModelMulti(ctx context.Context, entity *M) ([]M, error)

func (*GormRepository[M, E]) FindWithLimit 

func (r *GormRepository[M, E]) FindWithLimit(ctx context.Context, limit int, offset int, specifications ...Specification) ([]E, error)

func (*GormRepository[M, E]) FromModelToDto 

func (r *GormRepository[M, E]) FromModelToDto(models []M) []E

func (*GormRepository[M, E]) Insert 

func (r *GormRepository[M, E]) Insert(ctx context.Context, entity *E) error

func (*GormRepository[M, E]) InsertDirect 

func (r *GormRepository[M, E]) InsertDirect(ctx context.Context, entity *M) error

func (*GormRepository[M, E]) InsertFromInterface 

func (r *GormRepository[M, E]) InsertFromInterface(ctx context.Context, data interface{}) error

func (*GormRepository[M, E]) Update 

func (r *GormRepository[M, E]) Update(ctx context.Context, entity *E) error

func (*GormRepository[M, E]) UpdateDirect 

func (r *GormRepository[M, E]) UpdateDirect(ctx context.Context, entity *M) error

type Specification 

type Specification interface {
	GetQuery() string
	GetValues() []any
}

func And 

func And(specifications ...Specification) Specification

func Equal 

func Equal[T any](field string, value T) Specification

func GreaterOrEqual 

func GreaterOrEqual[T comparable](field string, value T) Specification

func GreaterThan 

func GreaterThan[T comparable](field string, value T) Specification

func In 

func In[T any](field string, value []T) Specification

func IsNull 

func IsNull(field string) Specification

func LessOrEqual 

func LessOrEqual[T comparable](field string, value T) Specification

func LessThan 

func LessThan[T comparable](field string, value T) Specification

func Like 

func Like[T any](field string, value T) Specification

func Not 

func Not(specification Specification) Specification

func Or 

func Or(specifications ...Specification) Specification

Source Files

View all Source files

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