title: Ember push record in model and update template
body: <p>I have this route in my Ember app:</p>
  
  <pre><code>model: function(params, transition) {
      var self = this;
  
      return Ember.RSVP.hash({
          photo: self.store.find('photo', params.id),
          comments: self.store.query('comment', {id: params.id})
      });
  },
  
  actions: {
      newComment: function(comment) {
          var record = this.store.createRecord('comment', comment);
  
      }
  }
  </code></pre>
  
  <p>The template:</p>
  
  <pre><code>{{#each model.comments as |comment|}}
      &lt;div class="card"&gt;
          &lt;div data-userId="{{comment.userId}}"&gt;
              &lt;b&gt;{{comment.username}}&lt;/b&gt;
          &lt;/div&gt;
          &lt;div&gt;
              {{comment.content}}
          &lt;/div&gt;
          &lt;span class="hide-on-small-only"&gt;{{i18n 'createdAt_lbl'}}: &lt;/span&gt;{{format comment.createdAt type='date'}}
      &lt;/div&gt;
  {{/each}}
  
  {{post-comment newComment='newComment' comments=model.comments}}
  </code></pre>
  
  <p>and the comment model:</p>
  
  <pre><code>export default DS.Model.extend({
      commentHash: DS.attr('string'),
      content: DS.attr('string'),
      createdAt: DS.attr('date'),
      username: DS.attr('string'),
      userHash: DS.attr('string'),
      userId: DS.attr('number'),
  });
  </code></pre>
  
  <p>The post-comment component is the one responsible to call the newComment action:</p>
  
  <pre><code>// post-comment component
  var self = this;
  
  // get the new comment content from textarea
  var $contentArea = this.$('#postCommentContent');
  var content = $contentArea.val();
  
  var newComment = {
      userId: localStorage.getItem('userId'),
      content: content,
      createdAt: moment().format('MMMM Do YYYY, h:mm:ss a')
  };
  self.sendAction('newComment', newComment);
  </code></pre>
  
  <p>What I need is to be able to add a new local comment (without persisting it on the server) dinamically and make the template update to show the newly added record without a complete page refresh</p>