Report parent-based resolvers on root fields

Author: vojtech-dobes

src/GraphQL/CorrespondanceRule.php

@@ -313,6 +313,10 @@ private function listObjectTypeResolvedValueTypes(
 	{
 		$result = [];
 
+		if ($objectType === $schemaServiceOraculum->getRootOperationType(Vojtechdobes\GraphQL\OperationType::Query)) {
+			return [new PHPStan\Type\NullType()];
+		}
+
 		foreach ($schemaServiceOraculum->listFieldsResolvedToObjectType($objectType) as [$parentObjectType, $parentFieldName]) {
 			[$parentTypes] = $this->listFieldResolvedValueTypes(
 				$scope,

tests-shared/AbstractCorrespondanceRuleTest.php

@@ -40,6 +40,10 @@ final public function testRule(): void
 				"Arguments array{arg1: string|null} of field Query.invalidArgumentsMismatch aren't contravariant with arguments array{} of resolver Vojtechdobes\TestsShared\Resolvers\QueryInvalidArgumentsMismatchFieldResolver",
 				-1,
 			],
+			[
+				"Resolver Vojtechdobes\GraphQL\PropertyFieldResolver of field Query.rootFieldWithParentBasedResolver expects parent to be an object, but parent is resolved to null",
+				-1,
+			],
 			[
 				"Resolver Vojtechdobes\TestsShared\Resolvers\PersonParentTypeNameFieldResolver of field PersonParentType.name expects parent to be Vojtechdobes\TestsShared\Resolvers\Person, but parent is resolved to array{}",
 				-1,

tests-shared/schema.graphqls

@@ -18,6 +18,8 @@ type Query {
 	providerOfValidEntityParentTypeEntity: EntityParentType!
 	providerOfValidEntityParentTypePerson: EntityParentType!
 	providerOfValidEntityParentTypeThing: EntityParentType!
+
+	rootFieldWithParentBasedResolver: String # should be eg. PropertyFieldResolver
 }
 
 type ArrayType {

tests/CustomAdapter.php

@@ -52,6 +52,8 @@ public function getFieldResolverProvider(string $schemaName): Vojtechdobes\Graph
 			'Query.providerOfValidEntityParentTypePerson' => new Vojtechdobes\TestsShared\Resolvers\QueryProviderOfValidEntityParentTypePersonFieldResolver(),
 			'Query.providerOfValidEntityParentTypeThing' => new Vojtechdobes\TestsShared\Resolvers\QueryProviderOfValidEntityParentTypeThingFieldResolver(),
 
+			'Query.rootFieldWithParentBasedResolver' => new Vojtechdobes\GraphQL\PropertyFieldResolver(),
+
 			'PersonParentType.name' => new Vojtechdobes\TestsShared\Resolvers\PersonParentTypeNameFieldResolver(),
 			'EntityParentType.name' => new Vojtechdobes\TestsShared\Resolvers\EntityParentTypeNameFieldResolver(),
 		]);