[Hackday][Serializer] Deserialization ignores argument type hint from phpdoc for array in constructor argument

src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php

@@ -358,20 +358,9 @@ abstract class AbstractNormalizer extends SerializerAwareNormalizer implements N
                         unset($data[$key]);
                         continue;
                     }
-                    try {
-                        if (null !== $constructorParameter->getClass()) {
-                            if (!$this->serializer instanceof DenormalizerInterface) {
-                                throw new LogicException(sprintf('Cannot create an instance of %s from serialized data because the serializer inject in "%s" is not a denormalizer', $constructorParameter->getClass(), static::class));
-                            }
-                            $parameterClass = $constructorParameter->getClass()->getName();
-                            $parameterData = $this->serializer->denormalize($parameterData, $parameterClass, $format, $this->createChildContext($context, $paramName));
-                        }
-                    } catch (\ReflectionException $e) {
-                        throw new RuntimeException(sprintf('Could not determine the class of the parameter "%s".', $key), 0, $e);
-                    }
 
                     // Don't run set for a parameter passed to the constructor
-                    $params[] = $parameterData;
+                    $params[] = $this->denormalizeParameter($reflectionClass, $constructorParameter, $paramName, $parameterData, $context, $format);
                     unset($data[$key]);
                 } elseif ($constructorParameter->isDefaultValueAvailable()) {
                     $params[] = $constructorParameter->getDefaultValue();
@@ -390,6 +379,27 @@ abstract class AbstractNormalizer extends SerializerAwareNormalizer implements N
         return new $class();
     }
 
+    /**
+     * @internal
+     */
+    protected function denormalizeParameter(\ReflectionClass $class, \ReflectionParameter $parameter, $parameterName, $parameterData, array $context, $format = null)
+    {
+        try {
+            if (null !== $parameter->getClass()) {
+                if (!$this->serializer instanceof DenormalizerInterface) {
+                    throw new LogicException(sprintf('Cannot create an instance of %s from serialized data because the serializer inject in "%s" is not a denormalizer', $parameter->getClass(), static::class));
+                }
+                $parameterClass = $parameter->getClass()->getName();
+
+                return $this->serializer->denormalize($parameterData, $parameterClass, $format, $this->createChildContext($context, $parameterName));
+            }
+
+            return $parameterData;
+        } catch (\ReflectionException $e) {
+            throw new RuntimeException(sprintf('Could not determine the class of the parameter "%s".', $parameterName), 0, $e);
+        }
+    }
+
     /**
      * @param array  $parentContext
      * @param string $attribute

src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php

@@ -304,6 +304,18 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
         throw new NotNormalizableValueException(sprintf('The type of the "%s" attribute for class "%s" must be one of "%s" ("%s" given).', $attribute, $currentClass, implode('", "', array_keys($expectedTypes)), \gettype($data)));
     }
 
+    /**
+     * @internal
+     */
+    protected function denormalizeParameter(\ReflectionClass $class, \ReflectionParameter $parameter, $parameterName, $parameterData, array $context, $format = null)
+    {
+        if (null === $this->propertyTypeExtractor || null === $types = $this->propertyTypeExtractor->getTypes($class->getName(), $parameterName)) {
+            return parent::denormalizeParameter($class, $parameter, $parameterName, $parameterData, $context, $format);
+        }
+
+        return $this->validateAndDenormalize($class->getName(), $parameterName, $parameterData, $format, $context);
+    }
+
     /**
      * Sets an attribute and apply the name converter if necessary.
      *

src/Symfony/Component/Serializer/Tests/DeserializeNestedArrayOfObjectsTest.php

@@ -0,0 +1,128 @@
+<?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;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\PropertyInfo\Extractor\PhpDocExtractor;
+use Symfony\Component\Serializer\Encoder\JsonEncoder;
+use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+use Symfony\Component\Serializer\Serializer;
+
+class DeserializeNestedArrayOfObjectsTest extends TestCase
+{
+    public function provider()
+    {
+        return array(
+            //from property PhpDoc
+            array(Zoo::class),
+            //from argument constructor PhpDoc
+            array(ZooImmutable::class),
+        );
+    }
+
+    /**
+     * @dataProvider provider
+     */
+    public function testPropertyPhpDoc($class)
+    {
+        //GIVEN
+        $json = <<<EOF
+{
+    "animals": [
+        {"name": "Bug"}
+    ]
+}
+EOF;
+        $serializer = new Serializer(array(
+            new ObjectNormalizer(null, null, null, new PhpDocExtractor()),
+            new ArrayDenormalizer(),
+        ), array('json' => new JsonEncoder()));
+        //WHEN
+        /** @var Zoo $zoo */
+        $zoo = $serializer->deserialize($json, $class, 'json');
+        //THEN
+        self::assertCount(1, $zoo->getAnimals());
+        self::assertInstanceOf(Animal::class, $zoo->getAnimals()[0]);
+    }
+}
+
+class Zoo
+{
+    /** @var Animal[] */
+    private $animals = array();
+
+    /**
+     * @return Animal[]
+     */
+    public function getAnimals()
+    {
+        return $this->animals;
+    }
+
+    /**
+     * @param Animal[] $animals
+     */
+    public function setAnimals(array $animals)
+    {
+        $this->animals = $animals;
+    }
+}
+
+class ZooImmutable
+{
+    /** @var Animal[] */
+    private $animals = array();
+
+    /**
+     * @param Animal[] $animals
+     */
+    public function __construct(array $animals = array())
+    {
+        $this->animals = $animals;
+    }
+
+    /**
+     * @return Animal[]
+     */
+    public function getAnimals()
+    {
+        return $this->animals;
+    }
+}
+
+class Animal
+{
+    /** @var string */
+    private $name;
+
+    public function __construct()
+    {
+        echo '';
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string|null $name
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+}