Zend 2 Form请求发现未找到

I'm learning Zend 2 framework and for a Form i need to test if my request is a post and if it is to get it

on the tutorial : http://framework.zend.com/manual/2.0/en/user-guide/forms-and-actions.html

they use this

$request = $this->getRequest();  // this is a AbstractActionController
if ($request->isPost()) {
$album = new Album();
$form->setInputFilter($album->getInputFilter());
$form->setData($request->getPost());
...
}

i have almost the same thing exept that i can't access the post method's on the request any idea why ?