如何在 gorm 中创建一对一关系和外键？

Question

Has One、Has Many和Belong To有什么区别

我有 3 个模型

User
Profile 其中 profile 和 user 应该有 one to one 关系
Category 其中 category 应该是 foreign key 到 user

type User struct {
gorm.Model
Email *string
Name string
...
}

type Profile struct {
gorm.Model
Phone string
Address string
...

}

type Category struct {
gorm.Model
Name string

}

Answer 1

对于UserHas OneProfile

type User struct {
   gorm.Model
   Email *string
   Name string
   Profile Profile //this is the key different
}
type Profile struct {
   gorm.Model
   UserId int //this is important
   Phone string
   Address string
}

对于ProfileBelong ToUser

type User struct {
   gorm.Model
   Email *string
   Name string
}
type Profile struct {
   gorm.Model
   UserId int //this is important
   User User //this is the key different
   Phone string
   Address string
}

对于UserHas ManyCategory

type User struct {
   gorm.Model
   Email *string
   Name string
   CategoryList []Category
}
type Category struct {
   gorm.Model
   UserId int //this is important
   Name string
}

编辑：UserId 字段将成为您的外键。

如果你想让gorm自动为你创建table，你可以在main.go

中使用AutoMigrate

err := db.AutoMigrate(your_model_package.User{})
if err != nil {
    return err
}

如何在 gorm 中创建一对一关系和外键？

How to create one to one relationship and foreign key in gorm?

go

go-gorm

go-fiber