go - 在 GORM 中与它自身的关系

Question

我想用 GORM 将实体与自身关联起来
我试过这个:

type project struct {
    gorm.Model
    Name     string
    ParentID uint
    projects []project `gorm:"foreignkey:ParentID,association_foreignkey:ID"`
}

    db.Create(&project{Name: "parent", ParentID: 0})
    db.Create(&project{Name: "child", ParentID: 1})
    db.Create(&project{Name: "child1", ParentID: 1})

    var project Project
    var projects []Project
    db.First(&project)
    db.Model(&project).Related(&projects)

但这是错误:

invalid association [] 

我想要的结果是:

{Name:"parent",
    projects:[
        {Name:"child",projects:[]},
        {Name:"child1",projects:[]}
             ]
}

我想提一下我是golang的新手:)

Answer 1

更改您的 projects标记到这个 - gorm:"foreignkey:ParentID"并公开该领域本身。要让有 child 的 parent 在其中做:

p := &project{}
err := db.Where("name = 'parent'").
          Preload("Projects").
          First(p).Error