Fix #923 Enabled support for DefaultValuePropertyDriver

DependencyInjection/Configuration.php

@@ -57,6 +57,7 @@ public function getConfigTreeBuilder()
     private function addConfigNodes($root): void
     {
         $root->scalarNode('enum_support')->defaultValue(false)->end();
+        $root->scalarNode('default_value_property_reader_support')->defaultValue(false)->end();
         $this->addHandlersSection($root);
         $this->addSubscribersSection($root);
         $this->addObjectConstructorsSection($root);

DependencyInjection/JMSSerializerExtension.php

@@ -264,6 +264,15 @@ private function loadInternal(array $config, ScopedContainer $container, array $
             $container->removeDefinition('jms_serializer.enum_subscriber');
         }
 
+        // enable the default value property reader on php 8.0+
+        if (PHP_VERSION_ID >= 80000 && $config['default_value_property_reader_support']) {
+            $container->getDefinition('jms_serializer.metadata.default_value_property_driver')
+                ->setDecoratedService('jms_serializer.metadata_driver')
+                ->setPublic(false);
+        } else {
+            $container->removeDefinition('jms_serializer.metadata.default_value_property_driver');
+        }
+
         $container
             ->getDefinition('jms_serializer.metadata_factory')
             ->replaceArgument(2, $config['metadata']['debug'])

Resources/config/services.xml

@@ -135,6 +135,12 @@
             <argument type="service" id="doctrine_phpcr" />
             <argument type="service" id="jms_serializer.type_parser" />
         </service>
+
+        <service id="jms_serializer.metadata.default_value_property_driver" class="JMS\Serializer\Metadata\Driver\DefaultValuePropertyDriver" public="false">
+            <argument id="jms_serializer.metadata.default_value_property_driver.inner" type="service"/>
+            <argument type="service" id="jms_serializer.type_parser" on-invalid="null" />
+        </service>
+
         <service id="jms_serializer.metadata.typed_properties_driver" class="JMS\Serializer\Metadata\Driver\TypedPropertiesDriver" public="false">
             <argument id="jms_serializer.metadata.typed_properties_driver.inner" type="service"/>
             <argument type="service" id="jms_serializer.type_parser" on-invalid="null" />

Resources/doc/configuration.rst

@@ -195,7 +195,8 @@ values:
         # config.yml
         jms_serializer:
             profiler: %kernel.debug%
-            enum_support: true # BHP 8.1 Enums support, false by default for backward compatibility
+            enum_support: true # PHP 8.1 Enums support, false by default for backward compatibility
+            default_value_property_reader_support: true # PHP 8.0 Constructor Promotion default value support, false by default for backward compatibility
             twig_enabled: 'default' # on which instance is twig enabled
             handlers:
                 datetime:

Tests/DependencyInjection/Fixture/DefaultValuePropObject.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace JMS\SerializerBundle\Tests\DependencyInjection\Fixture;
+
+class DefaultValuePropObject
+{
+    private string $foo = "some-value";
+
+    public function __construct(private string $boo = "another-value") {
+    }
+}

Tests/DependencyInjection/JMSSerializerExtensionTest.php

@@ -4,14 +4,17 @@
 
 namespace JMS\SerializerBundle\Tests\DependencyInjection;
 
+
 use Doctrine\Common\Annotations\AnnotationReader;
 use JMS\Serializer\EventDispatcher\EventSubscriberInterface;
 use JMS\Serializer\Exception\ExpressionLanguageRequiredException;
 use JMS\Serializer\Exception\RuntimeException;
 use JMS\Serializer\Handler\SubscribingHandlerInterface;
+use JMS\Serializer\Metadata\Driver\DefaultValuePropertyDriver;
 use JMS\Serializer\Metadata\Driver\TypedPropertiesDriver;
 use JMS\Serializer\SerializationContext;
 use JMS\SerializerBundle\JMSSerializerBundle;
+use JMS\SerializerBundle\Tests\DependencyInjection\Fixture\DefaultValuePropObject;
 use JMS\SerializerBundle\Tests\DependencyInjection\Fixture\AnotherSimpleObject;
 use JMS\SerializerBundle\Tests\DependencyInjection\Fixture\CastDateToIntEventSubscriber;
 use JMS\SerializerBundle\Tests\DependencyInjection\Fixture\IncludeInterfaces\AnInterfaceImplementation;
@@ -790,6 +793,46 @@ public function testTypedDriverIsEnabled()
         self::assertSame('int', $metadata->propertyMetadata['foo']->type['name']);
     }
 
+    public function testDefaultValuePropertyDriverCanBeEnabled()
+    {
+        if (PHP_VERSION_ID < 80000) {
+            $this->markTestSkipped(sprintf('%s requires PHP 8.0', __METHOD__));
+        }
+
+        if (!class_exists(DefaultValuePropertyDriver::class)) {
+            $this->markTestSkipped(sprintf('%s requires %s', __METHOD__, DefaultValuePropertyDriver::class));
+        }
+
+        $container = $this->getContainerForConfig([
+            ['default_value_property_reader_support' => true],
+        ]);
+
+        $metadata = $container->get('jms_serializer.metadata_driver')
+            ->loadMetadataForClass(new \ReflectionClass(DefaultValuePropObject::class));
+
+        self::assertSame('some-value', $metadata->propertyMetadata['foo']->defaultValue);
+        self::assertSame('another-value', $metadata->propertyMetadata['boo']->defaultValue);
+
+        $serializer = $container->get('jms_serializer');
+        $object = new DefaultValuePropObject();
+        $this->assertEquals('{"foo":"some-value","boo":"another-value"}', $serializer->serialize($object, 'json'));
+        $this->assertEquals($object, $serializer->deserialize('{}', DefaultValuePropObject::class, 'json'));
+    }
+
+    public function testDefaultValuePropertyDriverIsDisabledByDefault()
+    {
+        if (PHP_VERSION_ID < 80000) {
+            $this->markTestSkipped(sprintf('%s requires PHP 8.0', __METHOD__));
+        }
+
+        $container = $this->getContainerForConfig([[]]);
+
+        $serializer = $container->get('jms_serializer');
+        $object = new DefaultValuePropObject();
+
+        $this->assertNotEquals($object, $serializer->deserialize('{}', DefaultValuePropObject::class, 'json'));
+    }
+
     public function testIncludeInterfaces()
     {
         $container = $this->getContainerForConfig([