bug #37628 [Serializer] Support multiple levels of discriminator mapping (jeroennoten)

fabpot · fabpot · commit 2dbbe50d0c6b · 2020-07-23T08:55:00.000+02:00
This PR was merged into the 4.4 branch. Discussion ---------- [Serializer] Support multiple levels of discriminator mapping | Q | A | ------------- | --- | Branch? | 4.4 | Bug fix? | yes | New feature? | no | Deprecations? | no | License | MIT When using multiple levels of discriminator mapping for denormalizing to a multiple level class hierarchy, only the top level discriminator mapping is considered, resulting in an error: **Cannot instantiate abstract class ...** Example: ```php /** * @DiscriminatorMap(typeProperty="type", mapping={"group"=GroupNode::class, "item"=ItemNode::class}) */ abstract class Node { // ... } class GroupNode extends Node { // ... } /** * @DiscriminatorMap(typeProperty="item_type", mapping={"foo"=FooItemNode::class, "bar"=BarItemNode::class}) */ abstract class ItemNode extends Node { // ... } class FooItemNode { // ... } class BarItemNode { // ... } $objectNormalizer = new ObjectNormalizer(new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()))); $node = $objectNormalizer->denormalize(['type' => 'item', 'item_type' => 'foo']); ``` This results in an error: **Cannot instantiate abstract class ItemNode**. Expected is that `$node` is of type `FooItemNode` after denormalization. The solution is to recursively call `AbstractObjectNormalizer::instantiateObject()` when a mapping is found, instead of always calling `parent::instantiateObject()`. Commits ------- 324ad95 [Serializer] Support multiple levels of discriminator mapping
diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -230,8 +230,9 @@ protected function instantiateObject(array &$data, $class, array &$context, \Ref
                 throw new RuntimeException(sprintf('The type "%s" has no mapped class for the abstract object "%s".', $type, $class));
             }
 
-            $class = $mappedClass;
-            $reflectionClass = new \ReflectionClass($class);
+            if ($mappedClass !== $class) {
+                return $this->instantiateObject($data, $mappedClass, $context, new \ReflectionClass($mappedClass), $allowedAttributes, $format);
+            }
         }
 
         return parent::instantiateObject($data, $class, $context, $reflectionClass, $allowedAttributes, $format);
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -19,6 +19,7 @@
 use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorFromClassMetadata;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorMapping;
+use Symfony\Component\Serializer\Mapping\ClassDiscriminatorResolverInterface;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
 use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
@@ -235,6 +236,43 @@ public function hasMetadataFor($value): bool
         $this->assertInstanceOf(DummySecondChildQuux::class, $normalizedData->quux);
     }
 
+    public function testDenormalizeWithNestedDiscriminatorMap()
+    {
+        $classDiscriminatorResolver = new class() implements ClassDiscriminatorResolverInterface {
+            public function getMappingForClass(string $class): ?ClassDiscriminatorMapping
+            {
+                switch ($class) {
+                    case AbstractDummy::class:
+                        return new ClassDiscriminatorMapping('type', [
+                            'foo' => AbstractDummyFirstChild::class,
+                        ]);
+                    case AbstractDummyFirstChild::class:
+                        return new ClassDiscriminatorMapping('nested_type', [
+                            'bar' => AbstractDummySecondChild::class,
+                        ]);
+                    default:
+                        return null;
+                }
+            }
+
+            public function getMappingForMappedObject($object): ?ClassDiscriminatorMapping
+            {
+                return null;
+            }
+
+            public function getTypeForMappedObject($object): ?string
+            {
+                return null;
+            }
+        };
+
+        $normalizer = new AbstractObjectNormalizerDummy(null, null, null, $classDiscriminatorResolver);
+
+        $denormalizedData = $normalizer->denormalize(['type' => 'foo', 'nested_type' => 'bar'], AbstractDummy::class);
+
+        $this->assertInstanceOf(AbstractDummySecondChild::class, $denormalizedData);
+    }
+
     /**
      * Test that additional attributes throw an exception if no metadata factory is specified.
      */
