Symfony2 passing parameters to twig - symfony

Question

I'm working with Symfony 2 and I want to pass from my controller to my twig template a simple string and then use it on my template to descriminate the user role.
The controller code has something like :
public function modify_user_asAction(Request $request, $username)
{
$stringtopass="admin";
$um = $this->get('fos_user.user_manager');
$user = $um->findUserByUsername($username);
if($user == null){
//error page here..
}
$form = $this->createForm(new UserForm(), $user);
$form->handleRequest($request);
if ($form->isValid()) {
$um->updateUser($user);
return $this->redirect($this->generateUrl('acme_query_success'));
}
return $this->render('AcmeUserBundle:Default:modifyuserform.html.twig', array(
'form' => $form->createView(),
));
}
I want to pass $stringtopass in the generateUrl (if it's possible).
I can't find anything online.
Thanks

Answer 1

You are almost there!
API: generateUrl
Basically, just pass an array as second param to generateUrl.
return $this->redirect($this->generateUrl('acme_query_success', array('stringToPass' => $stringtopass)));
And also, #Brewal has a very valid point there. Be careful not to pass some sensitive data or leave unrestricted access to that controller's action. You could do more harm than good...
UPDATE:
public function acmeQuerySuccessAction(){
// ... action's logic
$stringToPass = $this->getRequest()->query->get('stringToPass');
// .....
return array(
'stringToPass' => $stringToPass,
// all other elements that you would normally return
);
}