title: Zend Framework 2 & Doctrine 2 - ManyToMany edit form is empty
body: <p>Here is a part of modiffilmAction(), to edit a film title and actors. There is a ManyToMany association between Films and Actors. There's only the title filling the form. If this code can work according to you, can you tell me how to fill the form? Or what's wrong in this code. I haven't found any example.</p>
  
  <pre><code>    $em = $this-&gt;getEntityManager();
  
      $qb = $em-&gt;createQueryBuilder();
  
      $qb -&gt;select(array('f','a'))
          -&gt;from('Cine\Entity\Films', 'f')
          -&gt;where($qb-&gt;expr()-&gt;eq('f.id', '?1'))
          -&gt;innerJoin('f.actors', 'a')
          -&gt;setParameter(1, $id);
      $query = $qb-&gt;getQuery();
      $film = $query-&gt;getResult();
  
      $form = new FilmForm($em);
      $form-&gt;bind($film);
      ...
  </code></pre>
  
  <p>If I replace the query, 
  $film = $em->find('Cine\Entity\Films', $id); 
  using fetch="eager" in the association, it's the same result : no binding data. </p>
  
  <p>I think I haven't understood something very simple but I'm new in zf2 and doctrine 2...
  Thanks for your help</p>