继承多个 HasMany 问题

Question

我的架构

db.user.hasMany(db.appointment, {
  foreignKey: 'user_id'
})
db.user.hasMany(db.appointment, {
  foreignKey: 'doctor_id'
})

db.appointment.belongsTo(db.user, {
  foreignKey: 'user_id'
})
db.appointment.belongsTo(db.user, {
  foreignKey: 'doctor_id'
})

table用户是医生和用户的共同点

之后我创建了 2 个约会

await Appointment.create({user_id: 13, doctor_id: 10 });
await Appointment.create({user_id: 14, doctor_id: 10 });

并尝试查询 ID 为 13 的用户的约会

  let user = await User.findByPk(13);
  return res.json(user.getAppointments())

我预计只有一次预约

{
    "id": 1,
    "createdAt": "2022-04-11T09:42:45.000Z",
    "updatedAt": "2022-04-11T09:42:45.000Z",
    "user_id": 13,
    "doctor_id": 10
}

但实际上我得到了

[
    {
        "id": 1,
        "createdAt": "2022-04-11T09:42:45.000Z",
        "updatedAt": "2022-04-11T09:42:45.000Z",
        "user_id": 13,
        "doctor_id": 10
    },
    {
        "id": 2,
        "createdAt": "2022-04-11T09:42:55.000Z",
        "updatedAt": "2022-04-11T09:42:55.000Z",
        "user_id": 14,
        "doctor_id": 10
    }
]

正如你看到的方法user.getAppointments() return me 2 appointment for user 13, 但实际上他只有一个约会（另一个约会属于用户14）。我想我在这里错了或遗漏了一些东西（比如 Java Hibernate 中的 mappedBy）

db.user.hasMany(db.appointment, {
  foreignKey: 'user_id'
})
db.user.hasMany(db.appointment, {
  foreignKey: 'doctor_id'
})

db.appointment.belongsTo(db.user, {
  foreignKey: 'user_id'
})
db.appointment.belongsTo(db.user, {
  foreignKey: 'doctor_id'
})

能帮忙改一下吗？提前致谢

Answer 1

如果您定义了从同一个模型到另一个相同模型的多个关联，那么您应该为关联模型指定唯一的别名，以便在所有查询中区分它们：

db.user.hasMany(db.appointment, {
  foreignKey: 'user_id',
  as: 'userAppointments'
})
db.user.hasMany(db.appointment, {
  foreignKey: 'doctor_id',
  as: 'doctorAppointments'
})

db.appointment.belongsTo(db.user, {
  foreignKey: 'user_id',
  as: 'user'
})
db.appointment.belongsTo(db.user, {
  foreignKey: 'doctor_id',
  as: 'doctor'
})

获取用户约会：

user.getUserAppointments()

预约医生：

doctor.getDoctorAppointments()

预约医生：

appointment.getDoctor()

获取约会的用户：

appointment.getUser()

继承多个 HasMany 问题

Sequelize multiple HasMany issue

has-many

one-to-many

belongs-to

node.js

sequelize.js