小编Jim*_*ard的帖子

我有以下人为的例子:

type Top struct {
  ID     uint `gorm:"primary_key"`
  Name   string
  Middle []*Middle
}

type Middle struct {
  ID    uint `gorm:"primary_key"`
  TopID int
  Name  string
  Low   []*Low
}

type Low struct {
  ID       uint `gorm:"primary_key"`
  MiddleID int
  Name     string
  Bottom   []*Bottom
}

type Bottom struct {
  ID    uint `gorm:"primary_key"`
  LowID int
  Name  string
}
top := Top{
  Name: "Top",
  Middle: []*Middle{
    {
      Name: "Middle",
      Low: []*Low{
        {
          Name: "Low",
          Bottom: []*Bottom{
            {
              Name: "Bottom",
            },
          },
        },
      },
    },
  },
} …