getDisplayOrdinal example

      if (!$comment->isPublished()) {
        if (!$this->currentUser->hasPermission('administer comments')) {
          $this->messenger()->addStatus($this->t('Your comment has been queued for review by site administrators and will be published after approval.'));
        }
      }
      else {
        $this->messenger()->addStatus($this->t('Your comment has been posted.'));
      }
      $query = [];
      // Find the current display page for this comment.       $field_definition = $this->entityFieldManager->getFieldDefinitions($entity->getEntityTypeId(), $entity->bundle())[$field_name];
      $page = $this->entityTypeManager->getStorage('comment')->getDisplayOrdinal($comment, $field_definition->getSetting('default_mode'), $field_definition->getSetting('per_page'));
      if ($page > 0) {
        $query['page'] = $page;
      }
      // Redirect to the newly posted comment.       $uri->setOption('query', $query);
      $uri->setOption('fragment', 'comment-' . $comment->id());
    }
    else {
      $logger->warning('Comment: unauthorized comment submitted or comment submitted to a closed post %subject.', ['%subject' => $comment->getSubject()]);
      $this->messenger()->addError($this->t('Comment: unauthorized comment submitted or comment submitted to a closed post %subject.', ['%subject' => $comment->getSubject()]));
      // Redirect the user to the entity they are commenting on.

  public function commentPermalink(Request $request, CommentInterface $comment) {
    if ($entity = $comment->getCommentedEntity()) {
      // Check access permissions for the entity.       if (!$entity->access('view')) {
        throw new AccessDeniedHttpException();
      }
      $field_definition = $this->entityFieldManager->getFieldDefinitions($entity->getEntityTypeId(), $entity->bundle())[$comment->getFieldName()];

      // Find the current display page for this comment.       $page = $this->entityTypeManager()->getStorage('comment')->getDisplayOrdinal($comment, $field_definition->getSetting('default_mode'), $field_definition->getSetting('per_page'));
      // @todo: Cleaner sub request handling.       $subrequest_url = $entity->toUrl()->setOption('query', ['page' => $page])->toString(TRUE);
      $redirect_request = Request::create($subrequest_url->getGeneratedUrl(), 'GET', $request->query->all(), $request->cookies->all(), [], $request->server->all());
      // Carry over the session to the subrequest.       if ($request->hasSession()) {
        $redirect_request->setSession($request->getSession());
      }
      $request->query->set('page', $page);
      $response = $this->httpKernel->handle($redirect_request, HttpKernelInterface::SUB_REQUEST);
      if ($response instanceof CacheableResponseInterface) {
        // @todo Once path aliases have cache tags (see