Loading, error substates

app.js

import Ember from 'ember';
import Resolver from './resolver';
import loadInitializers from 'ember-load-initializers';
import config from './config/environment';

let App;

Ember.MODEL_FACTORY_INJECTIONS = true;

App = Ember.Application.extend({
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix,
  Resolver,
  //LOG_RESOLVER: true
});

loadInitializers(App, config.modulePrefix);

export default App;

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('protoss', function() {
    this.route('khalai', function() {
      this.route('karax');
    });
  });
});

export default Router;

routes.protoss.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  model() {
    return new Ember.RSVP.Promise(function (resolve) {
      return setTimeout(function () {
        return resolve({id: 'protoss'});
      }, 1000);
    }); 
  }
  
});

routes.protoss.khalai.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  model() {
    return new Ember.RSVP.Promise(function (resolve) {
      return setTimeout(function () {
        return resolve({id: 'khalai'});
      }, 1000);
    });
  }
  
});

routes.protoss.khalai.karax.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  model() {
    return new Ember.RSVP.Promise(function (resolve, reject) {
      return setTimeout(function () {
        return reject(new Error('rejected'));
        //return resolve({id: 'karax'});
      }, 1000); 
    });
  }

});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{link-to "Protoss" "protoss"}} / {{link-to "Khalai" "protoss.khalai"}} / {{link-to "Karax" "protoss.khalai.karax"}}
{{outlet}}

templates.error.hbs

<br />
application-error<br />
{{model.message}}
{{model.stack}}

templates.loading.hbs

Application loading

templates.protoss.e12rror.hbs

<br />
Khalai-error<br />
{{model.message}}
{{model.stack}} 

templates.protoss.hbs

<br />
Protoss
{{outlet}}

templates.protoss.khalai.hbs

<br />
Khalai
{{outlet}}

templates.protoss.khalai.karax.hbs

<br />
Karax
{{outlet}}

templates.protoss.khalai.karax.loading.hbs

Karax loading

templates.protoss.khalai.loading.hbs

Khalai loading

templates.protoss.loading.hbs

Protoss loading

twiddle.json

{
  "version": "0.10.7",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.0",
    "ember-data": "2.10.0",
    "ember-template-compiler": "2.10.0",
    "ember-testing": "2.10.0"
  },
  "addons": {}
}