Composite Primary Key

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

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:

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