Constraints

type UserIndex struct {
    Name  string `gorm:"check:name_checker,name <> 'jinzhu'"`
    Name2 string `gorm:"check:name <> 'jinzhu'"`
    Name3 string `gorm:"check:,name <> 'jinzhu'"`
}

db, err := gorm.Open(sqlite.Open("gorm.db"), &gorm.Config{
  DisableForeignKeyConstraintWhenMigrating: true,
})

type User struct {
  gorm.Model
  CompanyID  int
  Company    Company    `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;"`
  CreditCard CreditCard `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;"`
}

type CreditCard struct {
  gorm.Model
  Number string
  UserID uint
}

type Company struct {
  ID   int
  Name string
}