Normalizing Issue with JSON API

adapters.application.js

import DS from 'ember-data';

export default DS.RESTAdapter.extend({
  namespace: 'api'
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['petName'],
  petName: null,
  
  filteredOwners: Ember.computed('petName', 'model.@each.pets.[]', function() {
    let petName = this.get('petName');
    let ownersArray = this.get('model').toArray();
    
    let filterPromise = Ember.RSVP.filter(ownersArray, owner => {
      return owner.get('pets').then( pets => {
        return pets.isAny('name', petName);
      });
    });

    return DS.PromiseArray.create({
      promise: filterPromise
    });
  })
});

mocks.js

export default function() {
  const videos = {
    "data": [
      {
        "type": "video",
        "id": "f745bec3-7871-43f2-945f-4a96cce5b3df",
        "attributes": {
          "hyphenated-attribute": "present",
          "simple": "also present"
        }
      }
    ]
  }
  
  getJSON('/api/videos', videos);
}

function getJSON(url, jsonResponse) {
  $.mockjax({ url: url, responseText: jsonResponse });
}

models.video.js

import DS from 'ember-data';

export default DS.Model.extend({
  hyphenatedAttribute: DS.attr('string'),
  simple: DS.attr('string')
});

routes.application.js

import Ember from 'ember';
import getMocks from '../mocks';

export default Ember.Route.extend({
  init() {
    this._super(...arguments);
    getMocks();
  },
  model() {
    // this works
    // https://ember-twiddle.com/dcfb829a48dbbcabee77778ec459861a
    // return this.store.findAll('video');
    
    // this removes hyphenated attributes
    return Ember.$.getJSON('/api/videos').then( response => {
      this.store.pushPayload(response);
      return this.store.peekAll('video');
    });
  }
});

serializers.application.js

import DS from 'ember-data';

export default DS.JSONAPISerializer.extend({
});

templates.application.hbs

<h1>Normalizing Issue</h1>

{{#each model as |video|}}
	<p>hyphenated attribute: {{video.hyphenatedAttribute}}</p>
  <p>simple: {{video.simple}}</p>
{{/each}}
{{outlet}}

twiddle.json

{
  "version": "0.4.8",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.1.0",
    "ember-data": "2.1.0",
    "ember-template-compiler": "2.1.0",
    "jquery-mockjax": "https://cdnjs.cloudflare.com/ajax/libs/jquery-mockjax/1.6.2/jquery.mockjax.js"
  }
}