Don't change model hook

controllers.application.js

import Ember from 'ember';

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

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('object-proxy');
  this.route('use-transition', { path: '/use-transition/:id' });
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    Ember.run.schedule('afterRender', () => {
      this.controller.set('model', 'world');

      const routeModel = this.modelFor('index');
      this.controller.set('routeModel', routeModel);
    });

    return 'hello';
  }
});

routes.object-proxy.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    Ember.run.schedule('afterRender', () => {
      this.controller.set('model.name', 'world');
      window.route = this;
      const routeModel = this.modelFor('objectProxy');
      this.controller.set('routeModel', routeModel);
    });

    return Ember.ObjectProxy.create({
      name: 'hello'
    });
  }
});

routes.use-transition.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    Ember.run.schedule('afterRender', () => {
      this.transitionTo('use-transition', { name: 'world' });
     
      Ember.run.schedule('afterRender', () => {
        const routeModel = this.modelFor('useTransition');
        this.controller.set('routeModel', routeModel);
      });
    });

    return { name: 'hello' };
  }
});

templates.application.hbs

<ul>
  <li>{{link-to 'Out of sync example' 'index'}}</li>
  <li>{{link-to 'Use Object wrapper' 'object-proxy'}}</li>
  <li>{{link-to 'Use transitionTo' 'use-transition' '1'}}</li>
</ul>
{{outlet}}

templates.index.hbs

<h2>Out of Sync</h2>
<p>
  Controller Model: {{model}}
</p>

<p>
  Model For Route: {{routeModel}}
</p>

<code>
  route.modelFor('index') is not in sync with controller.model
</code>

<p>
  {{link-to 'See fix using Object Proxy' 'object-proxy'}}
</p>

templates.object-proxy.hbs

<h2>Using Object Wrapper</h2>
<p>
  Controller Model: {{model.name}}
</p>

<p>
  Model For Route: {{routeModel.name}}
</p>

<code>
  route.modelFor('object-proxy') is in sync
</code>

templates.use-transition.hbs

<h2>Using transitionTo</h2>

<p>
  Controller Model: {{model.name}}
</p>

<p>
  Model For Route: {{routeModel.name}}
</p>

<code>
  route.modelFor('use-transition') is not in sync with controller.model
</code>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}