test

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  items: [1,3,4,5,6,7,8]
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#each items as |item|}}
	{{link-to item 'item' item}}
{{/each}}
<br>
<br>
{{outlet}}
<br>
<br>

item.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  counter: false,
  model(params){
  	return params.item_id
  },
  
  actions: {
  	willTransition(transition){
      var c = this.get('counter');
      
      if(!c){
        transition.abort();
      	this.set('counter', true);
        transition.retry();
      }
      
     
    }
  }
});

item.template.hbs

Im on item {{model}}

router.js

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

var Router = Ember.Router.extend({
  location: config.locationType
});

Router.map(function() {
  this.route('item', { path: '/:item_id' })
});

export default Router;

styles.app.css

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

a.active{
	color: red;
}

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}