title: how to change auth username after user profile edit in cakephp
body: <p>i have a situation where i need to allow current logged in user to change his username in cakephp. 
  when i update the username in database it doesn't reflect in </p>
  
  <pre><code> $this-&gt;Auth-&gt;user('username')
  </code></pre>
  
  <p>Even after changing record in database $this->Auth->user('username') is giving same old username because it is saved in current session.</p>
  
  <p>can anyone help me in how to update current $this->Auth session data</p>
  
  <p>Thanks in advance</p>