fix: Pass the child context when normalizing nested non-resource objects (api-platform#4521)

* fix: Pass the child context when normalizing nested non-resource objects

Currently, the `createChildContext()` method isn't used when normalizing embedded objects that are not resources. Hence, for example, the `PropertiesFilter` won't work for these objects.

This PR fixes that by invoking `createChildContext()` also for nested non-resource objects.

* Add behat test

Co-authored-by: Bernhard Schussek <[email protected]>

Author: norkunas

features/jsonld/non_resource.feature

@@ -38,6 +38,34 @@ Feature: JSON-LD non-resource handling
     }
     """
 
+  Scenario: Get a resource containing a raw object with selected properties
+    Given there are 1 dummy objects with relatedDummy and its thirdLevel
+    When I send a "GET" request to "/contain_non_resources/1?properties[]=id&properties[nested][notAResource][]=foo&properties[notAResource][]=bar"
+    Then the response status code should be 200
+    And the response should be in JSON
+    And the header "Content-Type" should be equal to "application/ld+json; charset=utf-8"
+    And the JSON should be a superset of:
+    """
+    {
+      "@context": "/contexts/ContainNonResource",
+      "@id": "/contain_non_resources/1",
+      "@type": "ContainNonResource",
+      "id": 1,
+      "nested": {
+        "@id": "/contain_non_resources/1-nested",
+        "@type": "ContainNonResource",
+        "notAResource": {
+          "@type": "NotAResource",
+          "foo": "f2"
+        }
+      },
+      "notAResource": {
+        "@type": "NotAResource",
+        "bar": "b1"
+      }
+    }
+    """
+
   @!mongodb
   @createSchema
   Scenario: Create a resource that has a non-resource relation.

src/Serializer/AbstractItemNormalizer.php

@@ -639,6 +639,17 @@ protected function getAttributeValue($object, $attribute, $format = null, array
 
         unset($context['resource_class']);
 
+        if ($type && $type->getClassName()) {
+            if (!\is_object($attributeValue) && null !== $attributeValue) {
+                throw new UnexpectedValueException('Unexpected non-object value for object property.');
+            }
+
+            $childContext = $this->createChildContext($context, $attribute, $format);
+            unset($childContext['iri']);
+
+            return $this->serializer->normalize($attributeValue, $format, $childContext);
+        }
+
         return $this->serializer->normalize($attributeValue, $format, $context);
     }
 

tests/Fixtures/TestBundle/Document/ContainNonResource.php

@@ -24,9 +24,12 @@
  * @ODM\Document
  *
  * @ApiResource(
- *     normalizationContext={
- *         "groups"={"contain_non_resource"},
+ *     attributes={
+ *         "filters"={"my_dummy.property"}
  *     },
+ *     normalizationContext={
+ *         "groups"={"contain_non_resource"}
+ *     }
  * )
  *
  * @author Kévin Dunglas <[email protected]>

tests/Fixtures/TestBundle/Entity/ContainNonResource.php

@@ -24,9 +24,12 @@
  * @ORM\Entity
  *
  * @ApiResource(
- *     normalizationContext={
- *         "groups"={"contain_non_resource"},
+ *     attributes={
+ *         "filters"={"my_dummy.property"}
  *     },
+ *     normalizationContext={
+ *         "groups"={"contain_non_resource"}
+ *     }
  * )
  *
  * @author Kévin Dunglas <[email protected]>