Async of Swim: Nested Routes. Replace route with Ember Concurrency Task

route.js

// routes/blog/comments.js
model: function (params){
  return {
    comments: this.get('commentsTask').perform()
  };
},
commentsTask: task(function *(){
  let blog = yield this.modelFor('blog').blogTask;
  let comments = yield blog.get('comments');
  return comments;
})

router.js

//Updated new router.js
Router.map(function() {
  this.route('blog',{path:"/blog/:blog_id"}, function (){
    this.route('comments', {path:"/comments"});
  });
});

template.hbs

// comments.hbs
{{#if model.comments.isRunning}}
  LOADING COMMENTS
{{else}}
  {{#each model.comments.value as |aComment|}}
    {{aComment.title}}<br>
  {{/each}}
{{/if}}