Has Many

Has Many 与另一个模型建立“一对多”的连接。不同于 Has One，拥有者可以拥有零个或多个模型实例。

例如，一个 User 可以有多张 CreditCard。

type User struct {
  gorm.Model
  CreditCards []CreditCard
}

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

外键

默认情况下，Has Many 关系使用所有者类型的名称加上其主键作为外键名称。

重写外键

type User struct {
  gorm.Model
  CreditCards []CreditCard `gorm:"foreignKey:UserRefer"`
}

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

自引用 Has Many

type User struct {
  gorm.Model
  ManagerID *uint
  Team      []User `gorm:"foreignKey:ManagerID"`
}