我有Customer結(jié)構(gòu)type Customer struct { Model Email string `json:"email,omitempty"` Addresses []Address}func (c *Customer) BeforeCreate() (err error) { if err := c.GenerateID(); err != nil { return err } return c.Marshal()}和Address結(jié)構(gòu)type Address struct { Model CustomerID string Address1 string}func (a *Address) BeforeCreate() error {// The ID is still generated, but the insert query has no `id` in it if err := a.GenerateID(); err != nil { return err } return nil}Model結(jié)構(gòu)type Model struct { ID string `gorm:"primary_key;type:varchar(100)"` CreatedAt time.Time UpdatedAt time.Time DeletedAt *time.Time `sql:"index"`}func (model *Model) GenerateID() error { uv4, err := uuid.NewV4() if err != nil { return err } model.ID = uv4.String() return nil}一個客戶：customer := &model.Customer{ Email: "a", Addresses: []model.Address{ { Address1: "abc street", }, },}if err := gormDb.Create(customer).Error; err != nil { return nil, err}I got an error: Error 1364: Field 'id' doesn't have a default value對于地址對象但是，如果我刪除這些Address關(guān)聯(lián)，一切都會奏效。并Id生成客戶。 customer := & model.Customer{ Email: "a", //Addresses: []model.Address{ //{ //Address1: "abc street", //}, //},}如何保持Address關(guān)聯(lián)并成功插入，并且仍然使用這種 ID 生成機(jī)制？
2 回答
MYYA
TA貢獻(xiàn)1868條經(jīng)驗(yàn) 獲得超4個贊
您可以使用scope.SetColumn在BeforeCreate鉤子中設(shè)置字段的值
func (a *Address) BeforeCreate(scope *gorm.Scope) error {
scope.SetColumn("ID", uuid.New())
return nil
}
參考：https ://v1.gorm.io/docs/create.html#Setting-Field-Values-In-Hooks
幕布斯7119047
TA貢獻(xiàn)1794條經(jīng)驗(yàn) 獲得超8個贊
您應(yīng)該使用tx.Statement.SetColumn在 GORM 掛鉤中設(shè)置字段值，例如BeforeCreate. 以下是示例實(shí)現(xiàn)。
func (s Product3) BeforeCreate(tx *gorm.DB) (err error) {
tx.Statement.SetColumn("Price", s.Price+100)
return nil
}
GORM Github repo 的參考實(shí)現(xiàn)鏈接 https://github.com/go-gorm/gorm/blob/ac722c16f90e0e0dffc600c7f69e791c110d788c/tests/hooks_test.go#L306-L309
來自 GORM 文檔的參考鏈接 https://gorm.io/docs/update.html#Change-Updating-Values
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