fix(graphql): check inheritance in ResolverProvider (#6314)

* fix(graphql): check inheritance in ResolverProvider

* fix(graphql): add unit test for interitance case

---------

Co-authored-by: josef.wagner <josef.wagner@hf-solutions.co>

src/GraphQl/State/Provider/ResolverProvider.php

@@ -69,7 +69,7 @@ private function getResourceClass(?object $item, ?string $resourceClass, string
             return $itemClass;
         }
 
-        if ($resourceClass !== $itemClass) {
+        if ($resourceClass !== $itemClass && !$item instanceof $resourceClass) {
             throw new \UnexpectedValueException(sprintf($errorMessage, (new \ReflectionClass($resourceClass))->getShortName(), (new \ReflectionClass($itemClass))->getShortName()));
         }
 

src/GraphQl/Tests/State/Provider/ResolverProviderTest.php

@@ -15,6 +15,9 @@
 
 use ApiPlatform\GraphQl\Resolver\QueryItemResolverInterface;
 use ApiPlatform\GraphQl\State\Provider\ResolverProvider;
+use ApiPlatform\GraphQl\Tests\Fixtures\ApiResource\ChildFoo;
+use ApiPlatform\GraphQl\Tests\Fixtures\ApiResource\ParentFoo;
+use ApiPlatform\Metadata\GraphQl\Query;
 use ApiPlatform\Metadata\GraphQl\QueryCollection;
 use ApiPlatform\State\ProviderInterface;
 use PHPUnit\Framework\TestCase;
@@ -35,4 +38,18 @@ public function testProvide(): void
         $provider = new ResolverProvider($decorated, $resolverLocator);
         $this->assertEquals($res, $provider->provide($operation, [], $context));
     }
+
+    public function testProvideInheritedClass(): void
+    {
+        $res = new ChildFoo();
+        $operation = new Query(class: ParentFoo::class, resolver: 'foo');
+        $context = [];
+        $decorated = $this->createMock(ProviderInterface::class);
+        $resolverMock = $this->createMock(QueryItemResolverInterface::class);
+        $resolverMock->expects($this->once())->method('__invoke')->willReturn($res);
+        $resolverLocator = $this->createMock(ContainerInterface::class);
+        $resolverLocator->expects($this->once())->method('get')->with('foo')->willReturn($resolverMock);
+        $provider = new ResolverProvider($decorated, $resolverLocator);
+        $this->assertEquals($res, $provider->provide($operation, [], $context));
+    }
 }