title: CakePHP more than one belongsTo
body: <p>How do I have more than one belongsTo for a model?</p>
  
  <p>e.g.</p>
  
  <pre><code>&lt;?php
  
  class Appointment extends AppModel
  {
      var $name = 'Appointment';
  
      var $useTable = 'appointments';
  
      var $belongsTo = 'Client','Doctor';
  }
  
  ?&gt;
  </code></pre>
  
  <p>Which breaks the app...</p>
  
  <p>As appointments belong to both a Client and a Doctor and clients can have many appointments and doctors many appointments (these associations work fine, it's just the belongsTo that isn't working)</p>