symfony
diff --git a/‎src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
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+8Lines changed: 8 additions & 0 deletions b/‎src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
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diff --git a/‎src/Symfony/Component/Serializer/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Serializer/Normalizer/ConstraintViolationListNormalizer.php
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+54Lines changed: 54 additions & 0 deletions b/‎src/Symfony/Component/Serializer/Normalizer/ConstraintViolationListNormalizer.php
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diff --git a/‎src/Symfony/Component/Serializer/Tests/Normalizer/ConstraintViolationListNormalizerTest.php
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+61Lines changed: 61 additions & 0 deletions b/‎src/Symfony/Component/Serializer/Tests/Normalizer/ConstraintViolationListNormalizerTest.php
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+61Lines changed: 61 additions & 0 deletions
@@ -33,6 +33,7 @@
 use Symfony\Component\Serializer\Encoder\YamlEncoder;
 use Symfony\Component\Serializer\Encoder\CsvEncoder;
 use Symfony\Component\Serializer\Mapping\Factory\CacheClassMetadataFactory;
+use Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer;
 use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
 use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
 use Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer;
@@ -1202,6 +1203,13 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
             $definition->addTag('serializer.normalizer', array('priority' => -900));
         }
 
+        if (class_exists('Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer')) {
+            // Run before serializer.normalizer.object
+            $definition = $container->register('serializer.normalizer.constraint_violation_list_normalizer', ConstraintViolationListNormalizer::class);
+            $definition->setPublic(false);
+            $definition->addTag('serializer.normalizer', array('priority' => -900));
+        }
+
         if (class_exists(YamlEncoder::class) && defined('Symfony\Component\Yaml\Yaml::DUMP_OBJECT')) {
             $definition = $container->register('serializer.encoder.yaml', YamlEncoder::class);
             $definition->setPublic(false);
 
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * added `SerializerPass`
+ * added `ConstraintViolationListNormalizer`
 
 3.1.0
 -----
 
@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Normalizer;
+
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+use Symfony\Component\Validator\ConstraintViolationListInterface;
+
+/**
+ * A normalizer that uses an objects own JsonSerializable implementation.
+ *
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class ConstraintViolationListNormalizer implements NormalizerInterface
+{
+    public function normalize($violationsList, $format = null, array $context = [])
+    {
+        $violations = [];
+        $messages = [];
+
+        foreach ($violationsList as $violation) {
+            $propertyPath = $violation->getPropertyPath();
+
+            $violations[] = [
+                'propertyPath' => $propertyPath,
+                'message' => $violation->getMessage(),
+            ];
+
+            $prefix = $propertyPath ? sprintf('%s: ', $propertyPath) : '';
+
+            $messages [] = $prefix.$violation->getMessage();
+        }
+
+        return [
+            'title' => 'An error occurred',
+            'detail' => $messages ? implode("\n", $messages) : (string) $violationsList,
+            'violations' => $violations,
+        ];
+    }
+
+    public function supportsNormalization($data, $format = null)
+    {
+        return $data instanceof ConstraintViolationListInterface;
+    }
+}
@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Normalizer;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer;
+use Symfony\Component\Validator\ConstraintViolation;
+use Symfony\Component\Validator\ConstraintViolationList;
+
+/**
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class ConstraintViolationNormalizerTest extends TestCase
+{
+    private $normalizer;
+
+    protected function setUp()
+    {
+        $this->normalizer = new ConstraintViolationListNormalizer();
+    }
+
+    public function testSupportsNormalization()
+    {
+        $this->assertTrue($this->normalizer->supportsNormalization(new ConstraintViolationList()));
+        $this->assertFalse($this->normalizer->supportsNormalization(new \stdClass()));
+    }
+
+    public function testNormalize()
+    {
+        $list = new ConstraintViolationList([
+            new ConstraintViolation('a', 'b', [], 'c', 'd', 'e'),
+            new ConstraintViolation('1', '2', [], '3', '4', '5'),
+        ]);
+
+        $expected = [
+            'title' => 'An error occurred',
+            'detail' => "d: a\n4: 1",
+            'violations' => [
+                [
+                    'propertyPath' => 'd',
+                    'message' => 'a',
+                ],
+                [
+                    'propertyPath' => '4',
+                    'message' => '1',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $this->normalizer->normalize($list));
+    }
+}