title: How to wait until find method has finished before doing further processing in Ember Model
body: <p>How can I wait until my find method has finished loading the model from the backend? After the model has loaded I want to fetch additional data and decorate my movie model with that data. The request to the external api from which the additional data is fetched is based upon properties of the movie model like year and title.</p>
  
  <pre><code>App.Movie.adapter = Ember.Adapter.create({
    find: function(record, objectId) {
      return Ember.$.ajax({
        headers: {
          'X-Parse-Application-Id': '',
          'X-Parse-REST-API-Key': ''
        },
        type: 'GET',
        url: 'https://api.parse.com/1/classes/Movie' + '/' + objectId
      }).then(function(data) {
        record.load(objectId, data);
      });
    }
  });
  
  App.MoviesMovieRoute = Ember.Route.extend({
    model: function (movie) {
      return App.Movie.find(movie.movie_id);
    },
  
    afterModel: function(movie, transition) {
      // currently undefined, undefined
      console.log(movie.get('title'), movie.get('year'));
    }
  });
  
  App.MoviesMovieController = Ember.ObjectController.extend({
    contentObserver: function () {
      // fetch additional data from external api
    }.observes('content')
  });
  </code></pre>
  
  <p>Thank you</p>