public function notificationAction($id)
    {
        /** @var PostInterface $post */
        $post = $this->get('opifer.form.post_manager')->getRepository()->find($id);

        if (!$post) {
            return $this->createNotFoundException();
        }

        $form = $post->getForm();

        /** @var Mailer $mailer */
        $mailer = $this->get('opifer.form.mailer');
        $mailer->sendNotificationMail($form, $post);

        $this->addFlash('success', 'Notification mail sent successfully');

        return $this->redirectToRoute('opifer_form_post_index', ['formId' => $form->getId()]);
    }