Symfony 2.8 | Twig | app.user and app.session null in stage env, ok in local and prod

Question

I am developing on an old project that uses Symfony 2.8.

I develop locally and in the Twig I can correctly use {{app.user.username}} or other like {{app.session...}} . When I deploy it in a staging environment those values are always blank. Then if I deploy it in production , the global app variable works fine as in local.

Is it possible that the staging env is configured to not to initialize the app variable? Where can I take a look?

Plus, a strange thing. The same behavior happens also if I make a custom, loading session data from the controller and passing them to the view.

Controller

$session = $this->get('session');

$content = $this->render(
            'blocks/logged_user_menu.html.twig',
            [
                'access_token_sc' => $session->get('access_token')
            ]
        );

View

{{ access_token_sc }}

I've read that I could take a look at Security config but doesn't seem to help.

Answer 1

Thanks to @john Smith comment I found out that this kind of problem is related to session.storage_id in the config.yml file. In my case the test config file was using mock_file that inhibited the session behavior.

Leaving here the explanation for reference: MockFileSessionStorage class

namespace Symfony\Component\HttpFoundation\Session\Storage;

/**
 * MockFileSessionStorage is used to mock sessions for
 * functional testing when done in a single PHP process.
 *
 * No PHP session is actually started since a session can be initialized
 * and shutdown only once per PHP execution cycle and this class does
 * not pollute any session related globals, including session_*() functions
 * or session.* PHP ini directives.
 *
 * @author Drak <drak@zikula.org>
 */
class MockFileSessionStorage extends MockArraySessionStorage
{ ...