ZF2 MongoDB ODM authentication

// module.config.php (adapt the module name and the entity name
'doctrine'  => array(
    'authentication'    => array(
        'odm_default'   => array(
            'object_manager'        => 'doctrine.documentmanager.odm_default',
            'identity_class'        => 'Users\Entity\User',
            'identity_property'     => 'email',
            'credential_property'   => 'password',
            /*'credential_callable' => function(User $user, $passwordGiven) {
                return any_check_test($user->getPassword(), $passwordGiven);
            }, /*_*/
        ),
    ),
    // module-name:Users and entity declared : Users\Entity\Users
    'driver'    => array(
        'users' => array(
            'class' => 'Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver',
            'cache' => 'array',
            'paths' => array(
                __DIR__ . '/../src/Users/Entity'
            ),
        ),
        'odm_default'   => array(
            'drivers'   => array(
                'Users\Entity' => 'users',
            ),
        ),
    ),
)

// inside the controller
public function loginAction() {
    /* use-case :
     * create a form
     *     if incoming data (from a login form) fill out the form with that data
     *         if form is valid    : authenticate the user (+redirect him)
     *             if not valid    : re-show the form (with data + validation errors )
     *     if not data received : show a new (empty) form
     * send the form to the view
     */
    $loginForm = $this->getServiceLocator()->get('LoginForm');
    //
    if ($this->request->isPost())
    {
        $loginForm->setData($this->request->getPost());
        if ($loginForm->isValid())
        {
            $data = $loginForm->getData();
            $authService = $this->getServiceLocator()
                        ->get('doctrine.authenticationservice.odm_default');

            $adapter = $authService->getAdapter();
            $adapter->setIdentityValue($data['email']);  // i am using email
            $adapter->setCredentialValue($data['password']);
            $authResult = $authService->authenticate();

            if ($authResult->isValid()) {
                return $this->redirect()->toRoute('home'); // or last viewed page
            }

            return array(
                'loginForm' => $loginForm,
                'errors' => 'Email or password is not valid',
            );

            $this->redirect()->toRoute('home');
        } /* else {
            //
            // LOG Event ( login|password not valide )
            //
            //Zend\Debug\Debug::dump("not valid data");
            //Zend\Debug\Debug::dump($loginForm->getMessages());
        }//* */
    }
    //
    return new ViewModel(array(
            'loginForm' => $loginForm,
    ));
}

public function logoutAction()
{
    $identity  = null;
    $authService = $this->getServiceLocator()->get('doctrine.authenticationservice.odm_default');
        if ( $authService->hasIdentity() ) {
            // in case you need it (log/etc... )
            $identity = $authService->getIdentity();
        }
        $authService->clearIdentity(); // clear anyway

    return $this->redirect()->toRoute('home');
    // or return array('msg'=>'disconnected'); // ajax?...
}