Comment Blog creating not working symfony

  crud, forms, symfony

Hello i was trying to add comment in blog everything is fine it shows no error but when i click submit nothing happens i mean it doesn’t add it in data base i dont know what im missing
this is what i have in controller

public function addCommentAction(Request $request, $id)
            return $this->redirectToRoute('fos_user_security_login');
        $add_comment = new CommentaireBlog();
        $em = $this->getDoctrine()->getManager();
        $blog = $em->getRepository(Blog::class)->find($id);
        $add_comment->setDate( new DateTime());

        $form = $this->createFormBuilder($add_comment)

            ->add('contenu', TextareaType::class)

        if ($request->getMethod() == 'POST') {

            if ($form->isSubmitted() && $form->isValid()) {
                $add_comment = $form->getData();
                $em = $this->getDoctrine()->getEntityManager();

                return $this->redirect($this->generateUrl('blog_details'));

        return $this->render('blog/details.html.twig', array(
            'form' => $form->createView(),
            'comment' => $add_comment,
            'blog' => $blog,


this is what i have in blog.yml

    path:     /{id}/details
    defaults: { _controller: "BlogBundle:Blog:addComment" }
    methods:  [GET, POST]

and finally this is the twig page

<div class="comments-form">
                                <h4 class="comments-title">Leave A Reply</h4>

                                    <!-- .row -->
                                    <form action="{{ path('comment_new', { 'id': }) }}" method="post" >

                                        <textarea id="form_comment" name="form[comment]" required="required" class="form-control comments-textarea" placeholder="Comments*"></textarea>

                                        <input type="submit" class="btn btn-default" />


Source: Symfony Questions