Caught Error

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('my-route');
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    error(err, transition) {
      if (err.errors[0].status === 404) {
        this.replaceWith('404');
      } else {
        // Just bubble up to default error route
        return true;
      }
    },
  },
});

routes.error.js

import Ember from 'ember';

export default Ember.Route.extend({
  setupController(controller, error) {
    /** 
     * Error object same as the one  that would
     * be caught in application's `actions.error` 
     * action.
     */
    console.log('error route, setup:', error);
    controller.set('error', error.errors[0]);
    
    this._super(...arguments);
  },
});

routes.my-route.js

import Ember from 'ember';

const {
  Route,
  RSVP: { reject }
} = Ember;

export default Route.extend({
  model(){
    console.log('The model fires.');
    return reject({errors: [{status: 500, message: "ERRRROORRRR!!"}]});
  },
  afterModel(){
    console.log('This will never be called. The afterModel does not fire.');
  },
});

templates.404.hbs

<h1>404 time</h1.

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#link-to "my-route"}}My Route{{/link-to}}
<br>
{{outlet}}
<br>
<br>

templates.error.hbs

<h3>Error route</h3>
{{error.status}}

templates.my-route.hbs

<h2>My Route</h2>

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"
  }
}