links

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

photos.photo.comment.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params){
    return {id: params['comment_id'], content: 'welcome'};
  }
});

photos.photo.comment.template.hbs

<p>Comment n°{{model.id}}, content: {{model.content}}</p>

photos.photo.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params){
  	return {
    	id:params['photo_id'],
      primaryComment:{id: 1, content:'hello'}
    }
  }
});

photos.photo.template.hbs

<p>{{#link-to "photos.photo.comment" model.primaryComment}}Main Comment{{/link-to}}</p>
<p>
  {{#link-to 'photos.photo.comment' 5 model.primaryComment}}
    Main Comment for the Next Photo
  {{/link-to}}
</p>

Photo n°{{model.id}}

{{outlet}}

router.js

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

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

Router.map(function() {
  this.route('photos', function(){
    this.route('photo', { path: '/:photo_id' }, function(){
      this.route('comments');
      this.route('comment', { path: '/comments/:comment_id' });
    });
  });
});

export default Router;

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}