relate

type ManyOne struct {
	Id      int
	Name    string
	ManyTwo []ManyTwo `gorm:"many2many:one_two_one"` //多对多关系 必须带着个标签
}

type ManyTwo struct {
	Id  int
	Age int
}

type More struct {
	gorm.Model
	Hobbies string
	OneID   int //关联键 一定得是 模型+ID   OId（×）
}

type One struct {
	gorm.Model
	Name  string
	Mores []More
}

type UserMaster struct {
	Id   int
	Name string
	Age  int
	Addr string
}

type UserSlave struct {
	Id           int
	Pic          string
	Phone        string
	UserMasterID int
	UserMaster   UserMaster //关联关系 这个字段名得和结构体保持一致 真的坑！！！
}