> 關聯查詢中關系有`包含 (Has One)`和`屬于 (Belongs to)`的區別，兩者屬于正反方向關系 > 本章主要介紹`屬于關系 (Belongs to)` [TOC] ## 屬于 (BELONG TO) ~~~ // `User`屬于`Profile`, `ProfileID`為外鍵 type User struct { gorm.Model Profile Profile ProfileID int } type Profile struct { gorm.Model Name string } // SELECT * FROM profiles WHERE id = 111; // 111是user的外鍵ProfileID db.Model(&user).Related(&profile) ~~~ ## 指定外鍵 ~~~ type Profile struct { gorm.Model Name string } type User struct { gorm.Model Profile Profile `gorm:"ForeignKey:ProfileRefer"` // 使用ProfileRefer作為外鍵 ProfileRefer int } ~~~ ## 指定外鍵和關聯外鍵 ~~~ type Profile struct { gorm.Model Refer string Name string } type User struct { gorm.Model Profile Profile `gorm:"ForeignKey:ProfileID;AssociationForeignKey:Refer"` ProfileID int } ~~~