AppBundle\Entity\Comment::getId PHP Метод

    public function getId()
    {
        return $this->id;
    }

 /**
  * @Security("has_role('ROLE_OKTOLAB_USER')")
  * @Route("/answer/{comment}", name="oktothek_answer_comment")
  * @Template()
  */
 public function answerCommentAction(Request $request, Comment $comment)
 {
     $answer = new Comment();
     $commentForm = $this->createForm(CommentType::class, $answer, ['action' => $this->generateUrl('oktothek_answer_comment', ['comment' => $comment->getId()])]);
     $commentForm->add('submit', SubmitType::class, ['label' => 'oktothek.comment_reply_button', 'attr' => ['class' => 'btn btn-primary']]);
     if ($request->getMethod() == "POST") {
         $commentForm->handleRequest($request);
         if ($commentForm->isValid()) {
             $answer->setUser($this->get('security.context')->getToken()->getUser());
             $answer->setReferer($comment->getReferer());
             $answer->setParent($comment);
             $comment->addChild($answer);
             $em = $this->getDoctrine()->getManager();
             $em->persist($comment);
             $em->persist($answer);
             $em->flush();
             $this->get('session')->getFlashBag()->add('success', 'oktothek.comment_create_success');
             return $this->redirect($request->headers->get('referer'));
         }
         $this->get('session')->getFlashBag()->add('error', 'oktothek.comment_create_error');
     }
     return ['commentForm' => $commentForm->createView()];
 }