title: Render custom entity type field in form (Symfony)
body: <p>I got stuck while trying to customize the rendering of a specific field in my form.
  It looks like this:</p>
  
  <pre><code>$builder-&gt;add('players', 'entity', array(
          'class' =&gt; 'Acme\Bundle\Entity\Player',
          'expanded' =&gt; true,
          'multiple' =&gt; true,
          'required' =&gt; false,
      ));
  </code></pre>
  
  <p>The form itself is beeing rendered with a simple:</p>
  
  <pre><code>{% block form_content %}
      {% form_theme form 'AcmeBundle:Form:fields_child.html.twig' %}
      {{ form_widget(form) }}
  {% endblock %}
  </code></pre>
  
  <p>Now inside fields_child.html.twig i'm extending from another form template but there is nothing special there. 
  My HTML looks like this:</p>
  
  <p>Players: 
   - [checkbox-input] 1</p>
  
  <p>Where 1 equals the id of the only player in the database. However instead of rendering the ID im trying to render his picture and full name after the checkbox.
  I have tried many combinations of the form theming to override it but failed each time.
  Could someone post the twig block to render what i want here?</p>
  
  <p>Thanks</p>