SerializedName used in message in ValidationExceptionNormalizer

Author: MartkCz

src/Bridge/Symfony/Bundle/Resources/config/graphql.xml

@@ -234,6 +234,7 @@
         </service>
 
         <service id="api_platform.graphql.normalizer.validation_exception" class="ApiPlatform\Core\GraphQl\Serializer\Exception\ValidationExceptionNormalizer">
+            <argument type="service" id="api_platform.name_converter" on-invalid="ignore" />
             <tag name="serializer.normalizer" priority="-780" />
         </service>
 

src/GraphQl/Serializer/Exception/ValidationExceptionNormalizer.php

@@ -17,6 +17,7 @@
 use GraphQL\Error\Error;
 use GraphQL\Error\FormattedError;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Validator\ConstraintViolation;
 
@@ -30,6 +31,13 @@
  */
 final class ValidationExceptionNormalizer implements NormalizerInterface
 {
+    private $nameConverter;
+
+    public function __construct(NameConverterInterface $nameConverter = null)
+    {
+        $this->nameConverter = $nameConverter;
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -38,7 +46,7 @@ public function normalize($object, $format = null, array $context = []): array
         /** @var ValidationException */
         $validationException = $object->getPrevious();
         $error = FormattedError::createFromException($object);
-        $error['message'] = $validationException->getMessage();
+        $error['message'] = $this->normalizeValidationException($validationException);
         $error['extensions']['status'] = Response::HTTP_BAD_REQUEST;
         $error['extensions']['category'] = 'user';
         $error['extensions']['violations'] = [];
@@ -61,4 +69,24 @@ public function supportsNormalization($data, $format = null): bool
     {
         return $data instanceof Error && $data->getPrevious() instanceof ValidationException;
     }
+
+    private function normalizeValidationException(ValidationException $exception): string
+    {
+        $message = '';
+        foreach ($exception->getConstraintViolationList() as $violation) {
+            if ('' !== $message) {
+                $message .= "\n";
+            }
+
+            $class = \is_object($root = $violation->getRoot()) ? \get_class($root) : null;
+            $propertyPath = $this->nameConverter ? $this->nameConverter->normalize($violation->getPropertyPath(), $class) : $violation->getPropertyPath();
+            if ($propertyPath) {
+                $message .= "$propertyPath: ";
+            }
+
+            $message .= $violation->getMessage();
+        }
+
+        return $message;
+    }
 }