Return a proper 422 HTTP status code when the form submission fails

src/Bundle/Controller/ControllerTrait.php

@@ -17,6 +17,7 @@
 use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\RedirectResponse;
@@ -246,6 +247,36 @@ protected function render(string $view, array $parameters = [], Response $respon
         return $response;
     }
 
+    /**
+     * Renders a view and sets the appropriate status code when a form is listed in parameters.
+     *
+     * If an invalid form is found in the list of parameters, a 422 status code is returned.
+     */
+    protected function renderForm(string $view, array $parameters = [], Response $response = null): Response
+    {
+        if (null === $response) {
+            $response = new Response();
+        }
+
+        foreach ($parameters as $k => $v) {
+            if ($v instanceof FormView) {
+                throw new \LogicException(sprintf('Passing a FormView to "%s::renderForm()" is not supported, pass directly the form instead for parameter "%s".', get_debug_type($this), $k));
+            }
+
+            if (!$v instanceof FormInterface) {
+                continue;
+            }
+
+            $parameters[$k] = $v->createView();
+
+            if (200 === $response->getStatusCode() && $v->isSubmitted() && !$v->isValid()) {
+                $response->setStatusCode(422);
+            }
+        }
+
+        return $this->render($view, $parameters, $response);
+    }
+
     /**
      * Streams a view.
      *

src/Bundle/Controller/ResourceController.php

@@ -223,12 +223,12 @@ public function createAction(Request $request): Response
             return $initializeEventResponse;
         }
 
-        return $this->render($configuration->getTemplate(ResourceActions::CREATE . '.html'), [
+        return $this->renderForm($configuration->getTemplate(ResourceActions::CREATE . '.html'), [
             'configuration' => $configuration,
             'metadata' => $this->metadata,
             'resource' => $newResource,
             $this->metadata->getName() => $newResource,
-            'form' => $form->createView(),
+            'form' => $form,
         ]);
     }
 
@@ -310,12 +310,12 @@ public function updateAction(Request $request): Response
             return $initializeEventResponse;
         }
 
-        return $this->render($configuration->getTemplate(ResourceActions::UPDATE . '.html'), [
+        return $this->renderForm($configuration->getTemplate(ResourceActions::UPDATE . '.html'), [
             'configuration' => $configuration,
             'metadata' => $this->metadata,
             'resource' => $resource,
             $this->metadata->getName() => $resource,
-            'form' => $form->createView(),
+            'form' => $form,
         ]);
     }