title: Override single route in Symfony2
body: <p>How can I override a single route in Symfony2?</p>
  
  <p>I have a bundle that comes with a <strong><code>bundle_routing.yml</code></strong> file.<br>
  In a bundle that extends this parent bundle i also have routing file:
  <strong><code>routing.xml</code></strong><br>
  Note that the files are named different.  </p>
  
  <p>In this routing file I like to override a single parent route.<br>
  I tried to simple redeclare it and change the pattern.<br>
  But it's not applied.  </p>
  
  <p>parent:</p>
  
  <pre><code>MyParentBundle_detailpage:
      pattern:  /detail
      defaults: { _controller: "MyParentBundle:Item:detail" }
  </code></pre>
  
  <p>child:  </p>
  
  <pre><code>&lt;route id="MyParentBundle_detailpage" pattern="/itemDetails"&gt;
          &lt;default key="_controller"&gt;MyParentBundle:Item:detail&lt;/default&gt;
  &lt;/route&gt;
  </code></pre>