left join on same table in sequelize

问题

I want to write following query in sequelize but Not able to understand how to do.

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

I have written below query as a single left join and it works fine.

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

And my assciotion is as follow:

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

Sender ID as well in Register User table.

回答1:

For that you have define one more association :

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

and then use it like :

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

来源：https://stackoverflow.com/questions/53591669/left-join-on-same-table-in-sequelize