fix(graphql): accept FilterInterface instance in QueryParameter

src/GraphQl/Type/FieldsBuilder.php

@@ -512,20 +512,16 @@ private function getParameterArgs(Operation $operation, array $args = []): array
                 $name = key($leafs);
 
                 $filterLeafs = [];
-                if (($filterId = $parameter->getFilter()) && $this->filterLocator->has($filterId)) {
-                    $filter = $this->filterLocator->get($filterId);
-
-                    if ($filter instanceof FilterInterface) {
-                        $property = $parameter->getProperty() ?? $name;
-                        $property = str_replace('.', $this->nestingSeparator, $property);
-                        $description = $filter->getDescription($operation->getClass());
-
-                        foreach ($description as $descKey => $descValue) {
-                            $descKey = str_replace('.', $this->nestingSeparator, $descKey);
-                            parse_str($descKey, $descValues);
-                            if (isset($descValues[$property]) && \is_array($descValues[$property])) {
-                                $filterLeafs = array_merge($filterLeafs, $descValues[$property]);
-                            }
+                if ($filter = $this->resolveFilter($parameter->getFilter())) {
+                    $property = $parameter->getProperty() ?? $name;
+                    $property = str_replace('.', $this->nestingSeparator, $property);
+                    $description = $filter->getDescription($operation->getClass());
+
+                    foreach ($description as $descKey => $descValue) {
+                        $descKey = str_replace('.', $this->nestingSeparator, $descKey);
+                        parse_str($descKey, $descValues);
+                        if (isset($descValues[$property]) && \is_array($descValues[$property])) {
+                            $filterLeafs = array_merge($filterLeafs, $descValues[$property]);
                         }
                     }
                 }
@@ -612,12 +608,12 @@ private function getFilterArgs(array $args, ?string $resourceClass, string $root
         }
 
         foreach ($resourceOperation->getFilters() ?? [] as $filterId) {
-            if (!$this->filterLocator->has($filterId)) {
+            if (!($filter = $this->resolveFilter($filterId))) {
                 continue;
             }
 
             $entityClass = $this->getStateOptionsClass($resourceOperation, $resourceOperation->getClass());
-            foreach ($this->filterLocator->get($filterId)->getDescription($entityClass) as $key => $description) {
+            foreach ($filter->getDescription($entityClass) as $key => $description) {
                 $filterType = \in_array($description['type'], TypeIdentifier::values(), true) ? Type::builtin($description['type']) : Type::object($description['type']);
                 if (!($description['required'] ?? false)) {
                     $filterType = Type::nullable($filterType);
@@ -751,4 +747,24 @@ private function normalizePropertyName(string $property, string $resourceClass):
 
         return $this->nameConverter->normalize($property, $resourceClass);
     }
+
+    /**
+     * Resolves a filter reference to a {@see FilterInterface} instance, supporting
+     * both a string service id (legacy/locator path) and an object form
+     * (`new QueryParameter(filter: new SortFilter())`).
+     */
+    private function resolveFilter(mixed $filter): ?FilterInterface
+    {
+        if ($filter instanceof FilterInterface) {
+            return $filter;
+        }
+
+        if (\is_string($filter) && $this->filterLocator->has($filter)) {
+            $resolved = $this->filterLocator->get($filter);
+
+            return $resolved instanceof FilterInterface ? $resolved : null;
+        }
+
+        return null;
+    }
 }

tests/Fixtures/TestBundle/ApiResource/Issue7966/SortFilterParameterDummy.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * 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\Issue7966;
+
+use ApiPlatform\Doctrine\Orm\Filter\SortFilter;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\GraphQl\QueryCollection;
+use ApiPlatform\Metadata\QueryParameter;
+
+#[ApiResource(
+    operations: [],
+    graphQlOperations: [
+        new QueryCollection(
+            provider: [self::class, 'provide'],
+            paginationEnabled: false,
+            parameters: [
+                'order[:property]' => new QueryParameter(filter: new SortFilter()),
+            ],
+        ),
+    ],
+)]
+final class SortFilterParameterDummy
+{
+    public ?string $id = null;
+    public ?string $name = null;
+
+    public static function provide(): array
+    {
+        return [];
+    }
+}

tests/Functional/GraphQl/Issue7966Test.php

@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * 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\Functional\GraphQl;
+
+use ApiPlatform\Symfony\Bundle\Test\ApiTestCase;
+use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue7966\SortFilterParameterDummy;
+use ApiPlatform\Tests\SetupClassResourcesTrait;
+
+/**
+ * Object-form filter (FilterInterface instance) combined with a bracketed parameter
+ * key crashed the GraphQL schema build because `filterLocator->has()` was called
+ * with the instance rather than a string service id.
+ *
+ * @see https://github.com/api-platform/core/issues/7966
+ */
+final class Issue7966Test extends ApiTestCase
+{
+    use SetupClassResourcesTrait;
+
+    protected static ?bool $alwaysBootKernel = false;
+
+    /**
+     * @return class-string[]
+     */
+    public static function getResources(): array
+    {
+        return [SortFilterParameterDummy::class];
+    }
+
+    public function testSchemaBuildsWithObjectFormFilterAndBracketedKey(): void
+    {
+        $response = self::createClient()->request('POST', '/graphql', ['json' => [
+            'query' => '{ __type(name: "SortFilterParameterDummy") { name } }',
+        ]]);
+
+        $this->assertResponseIsSuccessful();
+        $json = $response->toArray(false);
+        $this->assertArrayNotHasKey('errors', $json, json_encode($json['errors'] ?? null));
+        $this->assertSame('SortFilterParameterDummy', $json['data']['__type']['name']);
+    }
+}