如何在Symfony2中将变量从一个页面传递到另一个页面

Question

I have a login page that when logged in, returns a welcome page with the name of the user on it. I use this code to pass the variable $user to the welcome page:

return $this->render('LoginLoginBundle:Default:welcome.html.twig', array('user' => $user));

Now on the welcome page I have a nav, with the link to manager.html.twig on it.

This is the code of the link on the welcome page:

<li><a href="{{path('login_login_managerPage')}}">Manager</a></li>

The link goes to this route:

login_login_managerPage:
path:   /managerPage
defaults: { _controller: LoginLoginBundle:Default:manager }

which points to the managerAction:

public function managerAction(Request $request) {
    $session = $this->getRequest()->getSession();
    $em = $this->getDoctrine()->getEntityManager();
    $repository = $em->getRepository('LoginLoginBundle:User');
    if ($session->has('login')) {
        $login = $session->get('login');
        $username = $login->getUsername();
        $password = $login->getPassword();
        $user = $repository->findOneBy(array('username' => $username, 'password' => $password));
        if ($user) {
            return $this->render('LoginLoginBundle:Default:manager.html.twig', array('user' => $user));
        }
    }
    return $this->render('LoginLoginBundle:Default:login.html.twig');
}

Now I can't get $user to the managerpage. How can I pass it properly between pages?

EDIT: I editedy code but now I get this error:

Impossible to access an attribute ("username") on a NULL variable ("") in LoginLoginBundle:Default:welcome.html.twig at line 10 

Answer 1

Instead of writing your own security system, I would recommend you to use Symfony's own security component which has all the important things already done. Please read carefully this link : http://symfony.com/doc/current/book/security.html

Starting from here http://symfony.com/doc/current/book/security.html#using-a-traditional-login-form it shows how to get the user from a database. If you use symfony's security component then you will be able to get current logged in user as follows:

public function indexAction()
{
    $user = $this->get('security.context')->getToken()->getUser();
}

In a controller this can be shortcut to:

public function indexAction()
{
    $user = $this->getUser();
}

And last in template if you are using twig:

<p>Username: {{ app.user.username }}</p>