id-modes

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ID Modes Example

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This example demonstrates the different ID generation strategies available in the go-mongodb package.

 

Available ID Modes

 

1. ULID (Default)

• Value: ulid
• Description: Generates 26-character ULID strings with temporal ordering
• Best for: Applications needing time-based sorting and better database performance

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2. ObjectID

• Value: objectid
• Description: Generates standard MongoDB ObjectIDs
• Best for: Compatibility with existing MongoDB applications

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3. Custom

• Value: custom
• Description: No automatic ID generation; user provides their own _id
• Best for: Applications that need full control over document IDs

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Configuration

 

Environment Variable

export MONGODB_ID_MODE=ulid      # Default - ULID strings
export MONGODB_ID_MODE=objectid  # MongoDB ObjectIDs
export MONGODB_ID_MODE=custom    # User-provided IDs

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Programmatic Configuration

config := &mongodb.Config{
    Host:     "localhost",
    Port:     27017,
    Database: "myapp",
    IDMode:   mongodb.IDModeULID,      // Default
    // IDMode:   mongodb.IDModeObjectID,  // ObjectID mode
    // IDMode:   mongodb.IDModeCustom,    // Custom mode
}

client, err := mongodb.ConnectWithConfig(config)

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Running the Example

go run main.go

This will demonstrate all three ID modes and show how each one behaves.

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