Ember.js get 2 nested models in one route in asynchronous way

I have 2 calls to server, which proceed a long time (10-20 seconds). I need update information on page after first request (doesn't matters which) was finished. After second request finished - i need also update part of page.

How can be realised, because I've tried realise which Promises

App.IndexRoute = Ember.Route.extend({
    model: function(){
      return Ember.$.getJSON('url').then(firstMethod).then(secondMethod)
    }
})

but it doesn't work, because secondMethod will be executed after firstMethod will be finished.

Also I tried use this code:

App.IndexRoute = Ember.Route.extend({
  model: function() {
    return Ember.RSVP.hash({
      first_data: Ember.$.getJSON('url1'),
      second_data: Ember.$.getJSON('url2') 
    });
  }
});

But I have the same trouble - data will be return after 2 calls will be finished.

How run asynchronously these 2 requests and do independent update part of data on page ?