title: Add conditions using Contain
body: <p>I have following scenario:</p>
  
  <p>Model 1 <br />
  Model 2</p>
  
  <pre><code>$this-&gt;Model1-&gt;find('all', 
        array('contain' =&gt; array('Model2' =&gt; array('conditions' =&gt; array('Model1.field &gt; Model2.field')));
  </code></pre>
  
  <p>the above line of code is not working, can anyone help me finding the problem.
  Please ignore syntax and just see the situation and tell me how can i do this
  data of 2nd model is dependent on 1st model.</p>