title: CakePHP, HasMany Relationship
body: <p>Is it somehow possible to create a hasMany Relationship which makes use of an ID outside of the Model? For example one User has many Comments, but I would like to find just the comments of the logged in user:</p>
  
  <pre><code>public $hasMany = array(
      'MyComment' =&gt; array(
              'className' =&gt; 'Comment',
              'foreignKey' =&gt; 'user_id',
              'dependent' =&gt; false,
              'conditions' =&gt; array('Comment.user_id' =&gt; $loggedinUser_id),
              'fields' =&gt; '',
              'order' =&gt; '',
              'limit' =&gt; '',
              'offset' =&gt; '',
              'exclusive' =&gt; '',
              'finderQuery' =&gt; '',
              'counterQuery' =&gt; ''
          )
  );
  </code></pre>
  
  <p>I was thinking of passing the $loggedinUser_id in the controllers beforeFilter() to the model. Is this a good way to solve this issue or are there better ways?</p>
  
  <p>Any suggestion is appreciated.
  Thanks a lot!</p>