title: symfony: about passing parameters with url_for()
body: <p>I have this line in a template:</p>
  
  <pre><code>&lt;a href="&lt;?php echo url_for('category_set_representative_image', array('aux' =&gt; 4, 'sf_subject' =&gt; $category)) ?&gt;"&gt;jander&lt;/a&gt;
  </code></pre>
  
  <p>So as you can guess when I click that link, it executes an action. Inside that action I have this:</p>
  
  <pre><code>var_dump($request-&gt;getParameter('aux'));var_dump($request-&gt;getParameter('sf_subject'));die("fasf");
  </code></pre>
  
  <p>It's printing 4 and NULL. Why NULL? I expected the $category object was showed..</p>