title: Cakephp - get user id in controller when using Auth
body: <p>It seems like a two-step process to get this,</p>
  
  <pre><code>    $u = $this-&gt;Auth-&gt;user();
      $uid = $u['User']['id'];
  </code></pre>
  
  <p>Isn't there a variable set somewhere once a user is logged in? (Sorry for the dumb question.)</p>