Promises

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

routes.index.js

import Ember from 'ember';

const { RSVP,
       Mixin,
       Logger: { info },
       run
      } = Ember;

let MyMixin = Mixin.create({
	beforeModel() {
    this._super(...arguments);
  	info('at mixin');
    return timeoutPromise(3000)
      .then(() => {this.beforeModel2()});
  }
});

function timeoutPromise(milliseconds) {
  return new Promise(function(resolve,reject) {
    run.later(this, resolve, milliseconds);
  });
}

export default Ember.Route.extend(MyMixin, {
  /*
  beforeModel() {
    // OJO debe llevar return si queremos que la promesa del mixin se agote
    return this._super(...arguments);
    
    console.log(new Date(), " beforeModel");
    //return timeoutPromise();
  },
  
  */
  
  beforeModel2() {
  	info("El beforeModel2 de la ruta");
  },

  model() {
    console.log(new Date(), " model");
    return timeoutPromise(5000);
  },

  afterModel() {
    console.log(new Date(), " afterModel");
    return timeoutPromise(5000);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.9.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.0",
    "ember-template-compiler": "2.6.0"
  }
}