0

我想查询一对多的关系。我有以下结构:

type AppointmentsParticipants struct {
    AppointmentsID int `sql:",pk"`
    UserID int `sql:",pk"`
    Approved bool
    ReviewedAt time.Time
    ReviewedBy int
    Comment string
    Cancelled bool

}

type Appointments struct {
    ID int `sql:",pk"`
    Pending bool
    StartTime time.Time
    EndTime time.Time
    auditData
    InitialAppointmentID int
    SessionID string
    Type string
    AppointmentParticipants []*AppointmentsParticipants `json:"participants"`
}

我正在编写如下查询:

var app Appointments
err = database.DB().
        Model(&app).
        Column("*").
        Where("appointments_participants.user_id = ?", id).
        Join("JOIN appointments_participants ON appointments.id = appointments_participants.appointments_id").
        Select()

这会返回 Appointments 结构的所有值,但 AppointmentParticipants 切片除外。它返回一个空切片。我接受了 go-pg 编写的查询,并在 psql 中验证了它确实从约会参与者表中返回了一条记录。

这是输出:{140 true 2018-09-01 00:00:00 +0000 UTC 2018-09-01 01:00:00 +0000 UTC {2018-08-15 22:52:11.326775 +0000 UTC 5 0001-01-01 00:00:00 +0000 UTC 0} 0 Session []}

有趣的是,这个查询确实返回了一个错误:pg: can't find column=appointments_id in model=Appointments但是我尝试使用 struct 标签来尝试解决这个问题,但无济于事。

4

1 回答 1

0

尝试这样的查询:

err = database.DB().
    Model(&app).
    Column("AppointmentsParticipants").
    Relation("AppointmentsParticipants", func(q *orm.Query) (*orm.Query, error) {
        return q.Where("user_id = ?", id), nil
    }).
    Select()

如果不起作用,请尝试使用 ids、它们的字段名称和标签,go-pg 对此非常敏感。

于 2019-01-09T08:42:53.890 回答