复合主键

原文：https://gorm.io/docs/composite_primary_key.html

Set multiple fields as primary key creates composite primary key, for example:

​ 将多个字段设置为主键，创建复合主键，例如：

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type Product struct {
  ID           string `gorm:"primaryKey"`
  LanguageCode string `gorm:"primaryKey"`
  Code         string
  Name         string
}

Note integer PrioritizedPrimaryField enables AutoIncrement by default, to disable it, you need to turn off autoIncrement for the int fields:

注意：整数PrioritizedPrimaryField默认启用AutoIncrement，要禁用它，您需要为int字段关闭autoIncrement：

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type Product struct {
  CategoryID uint64 `gorm:"primaryKey;autoIncrement:false"`
  TypeID     uint64 `gorm:"primaryKey;autoIncrement:false"`
}