node.js - 在 sequelize 中左连接同一张表

Question

我想在 sequelize 中编写以下查询，但无法理解该怎么做。
SELECT * FROM RegisterUser AS RegisterUser LEFT OUTER JOIN Notification as Noti ON PM_UserID = Noti.ReceiveID LEFT OUTER JOIN RegisterUser AS RegisterUser1 ON Noti.SenderId = RegisterUser1.PM_UserID WHERE RegisterUser.PM_UserID = ReceiveID
我在下面的查询中写了一个左连接，它工作正常。

  RegisterUser.findAll({
include: [
  {
    model: Notification,
    as: 'NotificationrecipientId',
    required: false,
  },
],
raw: true });

我的关联如下:

db.RegisterUser.hasMany(db.Notifications, { as: 'NotificationrecipientId', foreignKey: 'ReceiveID' });

发件人 ID 以及注册用户表中。

Answer 1

为此，您又定义了一个关联:

db.Notification.belongsTo(db.RegisterUser, { as: 'Sender', foreignKey: 'SenderId' });

然后像这样使用它:

RegisterUser.findAll({
    include: [{
        model: Notification,
        as: 'NotificationrecipientId',
        required: false,
        include: [{
            model: RegisterUser,
            as: 'Sender', // <---- HERE
            required: false,
        }, ]
    }, ],
    raw: true
});