public function registerAction()
{
    Doctrine_Manager::connection()->beginTransaction();

    try {
        $form = new Form_User_Register();

        if ($this->_request->isPost()) {
            if ($form->isValid($this->_request->getPost())) {
                $user = new Model_User();
                $user->email = $form->getValue('email');
                $user->password = $form->getValue('password');
                $user->save();

                Doctrine_Manager::connection()->commit();

                $this->_helper->success('Registration has been successfully completed. You can login now.');
                $this->_redirect('/login');
            }
        }

        $this->view->form = $form;
    }
    catch (Doctrine_Connection_Exception $e) {
        if ($e->getPortableCode() == Doctrine_Core::ERR_ALREADY_EXISTS) {
            Doctrine_Manager::connection()->rollback();
            $this->registerAction();
        }
    }
    catch (Exception $e) {
        Doctrine_Manager::connection()->rollback();
        throw $e;
    }
}