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GORM で AUTO_INCREMENT でないプライマリキーを作成する

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GORM ではプライマリキーが int だと自動的に AUTO_INCREMENT が付与されます。
以下は MySQL での例です。

type Users struct {
    UserID int `gorm:"primary_key"`
}
db.AutoMigrate(Users)  // CREATE TABLE `users` (`user_id` int AUTO_INCREMENT , PRIMARY KEY (`user_id`))

AUTO_INCREMENT にしたくないときは struct tag で明示的にカラムタイプを指定します。

type Users struct {
    UserID int `sql:"type:int" gorm:"primary_key"`
}
db.AutoMigrate(Users)  // CREATE TABLE `users` (`user_id` int , PRIMARY KEY (`user_id`))

参考情報

https://github.com/jinzhu/gorm/issues/1002

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