title: How to make form_rest() not display a field with Symfony2?
body: <p>I've started to use Symfony2 but I've some problems.
  I wanted to render fields by hand but it doesn't work because my field yet rendered by me is displayed with the <code>form_rest()</code> function too, so I have two same fields.</p>
  
  <p>Here is my code :</p>
  
  <pre><code>&lt;div&gt;
       {{ form_errors(form.contenu) }}
       &lt;textarea id="{{ form.contenu.vars.id }}" name="{{ form.contenu.vars.full_name }}"&gt;{{ form.contenu.vars.value }}&lt;/textarea&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>And, at the form's end, I must put this :</p>
  
  <pre><code>{{ form_rest(form) }}
  </code></pre>
  
  <p>But it displays the "contenu" field :(</p>
  
  <p>Do you have an idea of what's the problem ?</p>