chained promise

controllers.application.js

import Ember from 'ember';

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

routes.application.js

import Ember from 'ember';
import { resolve } from 'rsvp';

export default Ember.Route.extend({
  model() {
    return resolve('a')
      .then(() => resolve('b'));
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
Model hook resolves with <strong>{{model}}</strong>.
<br>
<pre>
  model() {
    return resolve('a')
      .then(() => resolve('b'));
  }
</pre>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}