title: Set Flash in Symfony 2.1
body: <p>I have been adapting our code in preparation of moving our code to the new 2.1 Symfony codebase.</p>
  
  <p>In 2.0.* we could set Flash messages by simply calling the session service in our controller using the following</p>
  
  <pre><code>$this-&gt;get('session')-&gt;setFlash('type', 'message');
  </code></pre>
  
  <p>I have trawled through the new documentation, I was just wondering if there was a clean way, similar to the above; rather than just calling the FlashBagInterface?</p>