fix(jsonschema): access related subschema on readableLink

fixes api-platform#5501

The locations relation inside BrokenDocs is a Resource (named Related) but its only operation is a NotExposed. Still, serializer groups are set, and therefore it is a "readableLink" so we actually want to compute the schema, even if it's not accessible directly, it is accessible through that relation.

src/JsonSchema/SchemaFactory.php

@@ -24,6 +24,7 @@
 use ApiPlatform\Metadata\Resource\ResourceMetadataCollection;
 use ApiPlatform\Metadata\ResourceClassResolverInterface;
 use ApiPlatform\Metadata\Util\ResourceClassInfoTrait;
+use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue5501\Related;
 use Symfony\Component\PropertyInfo\Type;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
 use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
@@ -38,6 +39,8 @@ final class SchemaFactory implements SchemaFactoryInterface
     use ResourceClassInfoTrait;
     private array $distinctFormats = [];
 
+    // Edge case where the related resource is not readable (for example: NotExposed) but we have groups to read the whole related object
+    public const FORCE_SUBSCHEMA = '_api_subschema_force_readable_link';
     public const OPENAPI_DEFINITION_NAME = 'openapi_definition_name';
 
     public function __construct(private readonly TypeFactoryInterface $typeFactory, ResourceMetadataCollectionFactoryInterface $resourceMetadataFactory, private readonly PropertyNameCollectionFactoryInterface $propertyNameCollectionFactory, private readonly PropertyMetadataFactoryInterface $propertyMetadataFactory, private readonly ?NameConverterInterface $nameConverter = null, ResourceClassResolverInterface $resourceClassResolver = null)
@@ -300,24 +303,26 @@ private function getMetadata(string $className, string $type = Schema::TYPE_OUTP
             $inputOrOutput = Schema::TYPE_OUTPUT === $type ? ($operation->getOutput() ?? $inputOrOutput) : ($operation->getInput() ?? $inputOrOutput);
         }
 
-        if (null === ($inputOrOutput['class'] ?? $inputOrOutput->class ?? null)) {
+        $outputClass = ($serializerContext[self::FORCE_SUBSCHEMA] ?? false) ? ($inputOrOutput['class'] ?? $inputOrOutput->class ?? $operation->getClass()) : ($inputOrOutput['class'] ?? $inputOrOutput->class ?? null);
+
+        if (null === $outputClass) {
             // input or output disabled
             return null;
         }
 
         if (!$operation) {
-            return [$operation, $serializerContext ?? [], [], $inputOrOutput['class'] ?? $inputOrOutput->class];
+            return [$operation, $serializerContext ?? [], [], $outputClass];
         }
 
         return [
             $operation,
             $serializerContext ?? $this->getSerializerContext($operation, $type),
             $this->getValidationGroups($operation),
-            $inputOrOutput['class'] ?? $inputOrOutput->class,
+            $outputClass,
         ];
     }
 
-    private function findOperationForType(ResourceMetadataCollection $resourceMetadataCollection, string $type, Operation $operation)
+    private function findOperationForType(ResourceMetadataCollection $resourceMetadataCollection, string $type, Operation $operation): Operation
     {
         // Find the operation and use the first one that matches criterias
         foreach ($resourceMetadataCollection as $resourceMetadata) {

src/JsonSchema/TypeFactory.php

@@ -152,6 +152,7 @@ private function getClassType(?string $className, bool $nullable, string $format
             throw new \LogicException('The schema factory must be injected by calling the "setSchemaFactory" method.');
         }
 
+        $serializerContext += [SchemaFactory::FORCE_SUBSCHEMA => true];
         $subSchema = $this->schemaFactory->buildSchema($className, $format, Schema::TYPE_OUTPUT, null, $subSchema, $serializerContext, false);
 
         return ['$ref' => $subSchema['$ref']];

tests/Fixtures/TestBundle/ApiResource/Issue5501/BrokenDocs.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue5501;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use Doctrine\Common\Collections\ArrayCollection;
+use Symfony\Component\Serializer\Annotation\Groups;
+
+#[ApiResource(
+    operations: [
+        new Get(
+            normalizationContext: ['groups' => ['location:read_collection']]
+        ),
+    ]
+)]
+class BrokenDocs
+{
+    public ?int $id = null;
+
+    /**
+     * @var ?ArrayCollection<Related>
+     */
+    #[Groups(['location:write', 'location:read_collection'])]
+    public ?ArrayCollection $locations;
+}

tests/Fixtures/TestBundle/ApiResource/Issue5501/Related.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue5501;
+
+use ApiPlatform\Metadata\ApiResource;
+use Symfony\Component\Serializer\Annotation\Groups;
+
+#[ApiResource(operations: [])]
+class Related
+{
+    #[Groups(['location:write', 'location:read_collection'])]
+    public ?string $name = null;
+}

tests/JsonSchema/Command/JsonSchemaGenerateCommandTest.php

@@ -80,4 +80,17 @@ public function testExecuteWithJsonldTypeInput(): void
         $this->assertStringNotContainsString('@context', $result);
         $this->assertStringNotContainsString('@type', $result);
     }
+
+    /**
+     * Test issue #5501, the locations relation inside BrokenDocs is a Resource (named Related) but its only operation is a NotExposed.
+     * Still, serializer groups are set, and therefore it is a "readableLink" so we actually want to compute the schema, even if it's not accessible
+     * directly, it is accessible through that relation.
+     */
+    public function testExecuteWithNotExposedResourceAndReadableLink(): void
+    {
+        $this->tester->run(['command' => 'api:json-schema:generate', 'resource' => 'ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue5501\BrokenDocs', '--type' => 'output']);
+        $result = $this->tester->getDisplay();
+
+        $this->assertStringContainsString('Related.jsonld-location.read_collection', $result);
+    }
 }