Flash message not showing up in twig templates

3rd-Party Tools & Libraries
1

I have the below dependency injection configured.

I am using Version 6 | Session (odan.github.io) for the session management and flash messages.

$containerBuilder->addDefinitions([
    Twig::class => function (ContainerInterface $c): Twig {
        $twig = Twig::create($path, [
            'cache' => CHUM_CACHE_PATH,
            'autoescape' => false,
            'debug' => true
        ]);

        $flash = $c->get(SessionInterface::class)->getFlash();
        $twig->getEnvironment()->addGlobal('flash', $flash);

        return $twig;
    },
    SessionManagerInterface::class => function (ContainerInterface $c): SessionInterface {
        return $c->get(SessionInterface::class);
    },
    SessionInterface::class => function (ContainerInterface $c) {
        $options = [
            'name' => 'app',
            'lifetime' => 7200,
            'path' => null,
            'domain' => null,
            'secure' => false,
            'httponly' => true,
            'cache_limiter' => 'nocache',
        ];

        return new PhpSession($options);
    },
]);

$app->add(SessionStartMiddleware::class);

I am setting the error message when there is a form validation issue and redirect the page to the same url again to show the message.

class InstallController extends BaseController
{
    public function index(ServerRequestInterface $request, ResponseInterface $response, array $args): ResponseInterface
    {
         $form = $this->createForm(InstallAppConfigType::class);

        $req = Request::createFromGlobals();

        $this->session->getFlash()->set("error", array("Invalid Root Path"));

        $form->handleRequest($req);

        if ($form->isSubmitted() && $form->isValid()) {
            $app = $form->getData();

            if (!is_dir($app->getRootPath())) {
               // SETTING FLASH MESSAGE IN CASE OF ANY VALIDATION ISSUE
                $this->session->getFlash()->set("error", array("Invalid Root Path", "Check Permissions"));
                return $this->redirectByName($response, "install"); // redirect to same page to show error
            }

            return $this->redirectByName($response, "install.db");
        }

        return $this->render(
            $request,
            $response,
            'install.start.twig',
            array('form' => $form->createView())
        );
    }
}

Below is the twig template.

      <span>Test : {{ flash.get('error') | first }}</span>

      {% for message in flash.get('error') %}
      <div class="alert alert-error shadow-lg">
        <span>{{ message }}</span>
      </div>
      {% endfor %}

But unfortunately, I do not see any message shown. What I am missing here.

2

It looks like you are creating a second (Symfony) request object here, which is not the same as the Slim PSR-7 request object.

If you have a symfony/form or symfony/http and another session package within the same project, they may affect each other because the symfony/http package also includes an internal session and flash component and this may not work together.

1 Like
3

Yes, you are correct as usual. I am using symfony http and symfony forms.

I am able to see all the sessions/flash values when i dump the values in the controller. Only in the twig its now available.

dump($this->session->getFlash()->all());

How should I handle in such cases?

4

For debugging purpose, you could try to dump the “flash” Twig variable within the template. You may also try to pass the Flash object directly as template variable.