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我试图在我的应用程序中字段(和db列)的名称不相同的情况下创建“所属”关系作为类型名称。格姆正在抱怨这一点。下面是一个说明问题的一个简单的例子:无法创建与gorm的外键关系,其中字段名!=类型名称
package main
import (
"fmt"
"github.com/jinzhu/gorm"
_ "github.com/mattn/go-sqlite3"
)
type Car struct {
gorm.Model
Owner User
OwnerID int
}
type User struct {
gorm.Model
}
func main() {
db, _ := gorm.Open("sqlite3", "test.db")
defer db.Close()
db.LogMode(true)
db.CreateTable(&Car{}, &User{})
u := User{}
u.ID = 1
db.Create(&u)
c := Car{}
c.ID = 1
c.Owner = u
db.Create(&c)
cars := make([]Car, 5)
db.Find(&cars)
for i := range cars {
db.Model(cars[i]).Related(&cars[i].Owner)
}
for i := range cars {
fmt.Println(cars[i].Owner.ID)
}
}
我们希望这个程序打印出“1”作为自己的最后一行,因为这是用户关系的主键“拥有”唯一的汽车在数据库中。相反,“0”被打印出来,并详细日志记录显示错误在Related(&cars[i].Owner)
步:
(/home/nate/gocode/src/foo/main.go:26)
[2016-04-09 19:33:46] [122.35ms] CREATE TABLE "cars" ("id" integer primary key autoincrement,"created_at" datetime,"updated_at" datetime,"deleted_at" datetime,"owner_id" integer)
(/home/nate/gocode/src/foo/main.go:26)
[2016-04-09 19:33:46] [98.96ms] CREATE INDEX idx_cars_deleted_at ON "cars"(deleted_at)
(/home/nate/gocode/src/foo/main.go:26)
[2016-04-09 19:33:46] [108.95ms] CREATE TABLE "users" ("id" integer primary key autoincrement,"created_at" datetime,"updated_at" datetime,"deleted_at" datetime)
(/home/nate/gocode/src/foo/main.go:26)
[2016-04-09 19:33:46] [125.74ms] CREATE INDEX idx_users_deleted_at ON "users"(deleted_at)
(/home/nate/gocode/src/foo/main.go:30)
[2016-04-09 19:33:46] [0.53ms] INSERT INTO "users" ("id","created_at","updated_at","deleted_at") VALUES ('1','2016-04-09T19:33:46-04:00','2016-04-09T19:33:46-04:00','<nil>')
(/home/nate/gocode/src/foo/main.go:35)
[2016-04-09 19:33:46] [1.98ms] UPDATE "users" SET "created_at" = '2016-04-09T19:33:46-04:00', "updated_at" = '2016-04-09T19:33:46-04:00', "deleted_at" = '<nil>' WHERE "users".deleted_at IS NULL AND "users"."id" = '1'
(/home/nate/gocode/src/foo/main.go:35)
[2016-04-09 19:33:46] [0.43ms] INSERT INTO "cars" ("id","created_at","updated_at","deleted_at","owner_id") VALUES ('1','2016-04-09T19:33:46-04:00','2016-04-09T19:33:46-04:00','<nil>','1')
(/home/nate/gocode/src/foo/main.go:38)
[2016-04-09 19:33:46] [0.64ms] SELECT * FROM "cars" WHERE "cars".deleted_at IS NULL
(/home/nate/gocode/src/foo/main.go:40)
[2016-04-09 19:33:46] invalid association []
0
这到底是怎么回事?是否在Owner
字段中使用了一些特殊标签?我试过使用gorm:"ForeignKey:owner_id"
和gorm:"AssociationForeignKey:owner_id"
,两者都给出了相同的结果。
真的没有自动的方式来做到这一点与标签,我必须每次指定密钥? –
@NateMara https://github.com/jinzhu/gorm/blob/master/scope.go#L962我看到只有一种方法可以实现自动化 - 在子模型之后命名您的字段。 –