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我有一个用户表和一个用户组的表，他们之间是多对多的关系，我自定义可以通过多对多的关联表实现查找/删除，但是增加报错,在迁移表结构的时候禁用了外键,使用的逻辑关联 用户表： 类型用户结构{ common.Model gorm.Model UserName string gorm:"column:username;type:varchar(50);not null;unique;comment:用户名" json:"username" form:"username" Groups []Group gorm:"many2many:user_groups" json:"groups,omitempty" } 组表： type Group struct { gorm.Model GroupName string gorm:"column:group_name;type:varchar(100);not null;unique;comment:用户组名" json:"group_name" form:"group_name" Describe string gorm:"column:describe;type:varchar(500);not null;comment:用户组描述" json:"describe" form:"describe" Users Users gorm:"many2many:user_groups" json:"users,omitempty" swaggerignore:"true" } 用户组和用户关联表（自定义）： type UserGroup struct { gorm.Model UserID uint gorm:"index;column:user_id;type:bigint;not null;comment:用户ID" json:"user_id" form:"user_id" GroupID uint gorm:"index;column:group_id;type:bigint;not null;comment:用户组ID" json:"group_id" form:"group_id" 运算符字符串gorm:"column:operator;type:varchar(100);null;default:'';comment:操作人" json:"operator" form:"operator" IsOwner bool gorm:"column:is_owner;type:bool;default:false;comment:是否是owner" json:"is_owner" form:"is_owner"
}
func (UserGroup) TableName() string { return "user_groups" }
执行的操作： func (g Group) AddUserToGroup(c gin.Context) (err error) { var user1 User user1.ID = 1 user1.GetUserWithID(nil) a := db.Debug().Model(g) .Association("Users").Append(&user1) fmt.Println(a) return }
Expected answer
实际: 在用户user1和组g都已经存在的前提下,中间表UserGroup的记录不会创建，同时报告 用户user1已经存在
期望: 在用户user1和组g都已经存在的前提下, 数据能够在中间表UserGroup创建一条记录
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Comment From: a631807682
duplicate of https://github.com/go-gorm/gorm/issues/5378