comparison core/modules/book/src/Controller/BookController.php @ 17:129ea1e6d783

Update, including to Drupal core 8.6.10

   public function bookExport($type, NodeInterface $node) {
     $method = 'bookExport' . Container::camelize($type);
 
     // @todo Convert the custom export functionality to serializer.
     if (!method_exists($this->bookExport, $method)) {
-      drupal_set_message(t('Unknown export format.'));
+      $this->messenger()->addStatus(t('Unknown export format.'));
       throw new NotFoundHttpException();
     }
 
     $exported_book = $this->bookExport->{$method}($node);
     return new Response($this->renderer->renderRoot($exported_book));