New Twiddle

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('activities', function() {
  });
  
  this.route('details', { path: ':activity_id' });
});

export default Router;

routes.activities.index.js

import Ember from 'ember';

const {
  get,
  inject: { service }
} = Ember;

export default Ember.Route.extend({
  history: service(),
  
  model() {
   	return [{ id: 1,
              name: 'An Activity' }];
  },
  
  afterModel(_, transition) {
   	get(this, 'history').push(transition); 
  }
  
});

routes.details.js

import Ember from 'ember';

const {
  get,
 	inject: { service } 
} = Ember;

export default Ember.Route.extend({
  history: service(),
  
  actions: {
   	back() {
     	let transition = get(this, 'history').pop(); 
      
      if (transition) {
        transition.retry();
      }
    }
  }
});

services.history.js

import Ember from 'ember';

export default Ember.Service.extend({
  
  history: [],
  
  push(transition) {
   	Ember.get(this, 'history').push(transition); 
  },
  
  pop() {
   	return Ember.get(this, 'history').pop(); 
  }
  
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.active {
 	color: red; 
}

templates.activities.index.hbs

{{#each model as |activity|}}
	<p>{{link-to activity.name 'details' activity}}</p>
{{/each}}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{link-to 'Activities' 'activities'}}

{{outlet}}
<br>
<br>

templates.details.hbs

<h3>Details</h3>

<a href="#" {{action 'back'}}>Back</a>

<p>{{model.name}}</p>

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": "2.10.2",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {
    "ember-data": "2.9.0"
  }
}