title: can't update entity Symfony2
body: <p>Trying to update my entity, unfortunately didnt use Doctrines generate CRUD feature (have to change stuff I didnt write). 
  I am finally getting data into my form, but it just won't save the changes (also, it doesn't create a new entity as one might suspect).
  When I click 'save', I always return to the page where I have my form to edit the entity.
  Checked if method is POST, it is.</p>
  
  <pre class="lang-php prettyprint-override"><code> if ($form-&gt;get('save')-&gt;isClicked()) {
  </code></pre>
  
  <p>doesn't seem to do anything, how can that be?</p>
  
  <p>Here's the rest of my action:</p>
  
  <pre class="lang-php prettyprint-override"><code>  /**
       * Updates.
       *
       * @Route("/offerweekchange/{offerid}", name="offerweekchange")
       * @Template("")
       */
      public function offerweekchangeAction(Request $request, $offerid)
      {
          $request = $this-&gt;get('request');
          if ($offerid) {
              $em = $this-&gt;getDoctrine()-&gt;getManager();
              $entity = $em-&gt;getRepository('AlexanderBuerkleShopBundle:Promotion')-&gt;findOneBy(array('id' =&gt; $offerid));
  
              $form = $this-&gt;createForm(new OfferWeekChangeType(), $entity);
             # \Doctrine\Common\Util\Debug::dump($request-&gt;getMethod());
              if ($form-&gt;get('save')-&gt;isClicked()) {
                  if ($request-&gt;getMethod() == 'POST') {
  
                      $form-&gt;bind($request);
                      if ($form-&gt;isValid()) {
                          $em-&gt;flush();
                          return $this-&gt;redirect($this-&gt;generateUrl('offerweeklist'));
                          }
                      }
                  }
  
              return $this-&gt;render('AlexanderBuerkleShopBundle:OfferWeekList:offerweekchange.html.twig',
                  array('form' =&gt; $form-&gt;createView(), 'offerid' =&gt; $offerid, 'entity' =&gt; $entity));
  
          }
      }
  </code></pre>
  
  <p>Any help would be greatly appreciated.</p>