Ember new database new record event and observer.

My web app is built using Ember.JS and Firebase for storing data. It also serves as a backend for a mobile app. Users can use mobile app to send a 'help-request' - the app manipulates directly with the Firebase records. When the change is made admin of the web app can see the notification on the screen. That works fine. Now I want to add a sound to this notification.

My general idea to solve it to add an observer that will be triggered when a new record of help-request type is added to the database.

I found a post sort of explaining how to do it but it's using deprecated methods like ArrayControler.

I added a simple observer to help-request model that is triggered when property/ies of the record are modified. That works fine but seems to be a hack rather than a real solution.

So the big question is: 1. Is there any callback, or event, or notification that I can subscribe to check if a new record is created in the Firebase? If so how would I subscribe to it?

import DS from 'ember-data';

export default DS.Model.extend({
    device: DS.attr('string'),
    userName: DS.attr('string'),
    locationName: DS.attr('string'),
    type: DS.attr('string'),
    fullNameChanged: function() {

      // deal with the change
      console.log("FULL NAME");
    }.observes('device').on('init')
});