title: Force evaluate a lazy query
body: <p>Is there a way to evaluate the following expression?</p>
  
  <pre><code>instances = Catalog.objects.filter(q)
  </code></pre>
  
  <p>I am trying to profile it, but since it is lazy, it won't actually do the evaluation until it returns it. I was thinking <code>list(instances</code>), is there anything else?</p>