I create two models in sequelize. I got array of results "Users" and than loop through to get or create new "Room" based on User.id. I want to print all rooms after all is done. I got empty array in console, because its asynchronious. How can I call console.log after creating all Rooms?

```
var Users = sequelize.import(__dirname + "/../models/own/user");
var Rooms = sequelize.import(__dirname + "/../models/own/room");    
var _this = this;

this.users = [];
this.rooms = [];

Users.findAll().then(function(users) {
    _this.users = users;

    users.forEach(function(user){

        Rooms.findOrCreate({where: {user_id: user.get('id')}})
        .spread(function(room, created) {
          _this.rooms.push(
            room.get({
              plain: true
            })
          );

        });

    });

    console.log(_this.rooms)

});

```