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Introduce resolveValue method to Interface and Union types
This allows transforming the object value after type resolution. This is useful when you have a single entity that needs different representations. For example, when your data layer returns a generic `PetEntity` with a type discriminator, but your GraphQL schema has separate `Dog` and `Cat` types. Example: ```php $PetType = new InterfaceType([ 'name' => 'Pet', 'resolveType' => static function (PetEntity $objectValue): string { if ($objectValue->type === 'dog') { return 'Dog'; } return 'Cat'; }, 'resolveValue' => static function (PetEntity $objectValue) { if ($objectValue->type === 'dog') { return new Dog($objectValue->name, $objectValue->woofs); } return new Cat($objectValue->name, $objectValue->meows); }, 'fields' => ['name' => ['type' => Type::string()]], ]); Now field resolvers receive the properly typed Dog or Cat object instead of the generic PetEntity, allowing for type-safe resolution without needing to transform objects before they reach the type resolver. Common use cases: - Database polymorphism (single table with type column) - External APIs returning generic objects with type discriminators
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‎src/Executor/ReferenceExecutor.php‎

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@@ -1092,6 +1092,7 @@ protected function completeAbstractValue(
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$contextValue
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) {
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$typeCandidate = $returnType->resolveType($result, $contextValue, $info);
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$result = $returnType->resolveValue($result, $contextValue, $info);
10951096

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if ($typeCandidate === null) {
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$runtimeType = static::defaultTypeResolver($result, $contextValue, $info, $returnType);

‎src/Type/Definition/AbstractType.php‎

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@@ -7,6 +7,7 @@
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/**
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* @phpstan-type ResolveTypeReturn ObjectType|string|callable(): (ObjectType|string|null)|Deferred|null
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* @phpstan-type ResolveType callable(mixed $objectValue, mixed $context, ResolveInfo $resolveInfo): ResolveTypeReturn
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* @phpstan-type ResolveValue callable(mixed $objectValue, mixed $context, ResolveInfo $resolveInfo): mixed
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*/
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interface AbstractType
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{
@@ -21,4 +22,14 @@ interface AbstractType
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* @phpstan-return ResolveTypeReturn
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*/
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public function resolveType($objectValue, $context, ResolveInfo $info);
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/**
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* Resolves/transforms the value after type resolution.
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*
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* @param mixed $objectValue The resolved value for the object type
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* @param mixed $context The context that was passed to GraphQL::execute()
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*
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* @return mixed The transformed value (or original if no transformation needed)
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*/
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public function resolveValue($objectValue, $context, ResolveInfo $info);
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}

‎src/Type/Definition/InterfaceType.php‎

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@@ -10,6 +10,7 @@
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/**
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* @phpstan-import-type ResolveType from AbstractType
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* @phpstan-import-type ResolveValue from AbstractType
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* @phpstan-import-type FieldsConfig from FieldDefinition
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*
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* @phpstan-type InterfaceTypeReference InterfaceType|callable(): InterfaceType
@@ -19,6 +20,7 @@
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* fields: FieldsConfig,
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* interfaces?: iterable<InterfaceTypeReference>|callable(): iterable<InterfaceTypeReference>,
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* resolveType?: ResolveType|null,
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* resolveValue?: ResolveValue|null,
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* astNode?: InterfaceTypeDefinitionNode|null,
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* extensionASTNodes?: array<InterfaceTypeExtensionNode>|null
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* }
@@ -76,6 +78,15 @@ public function resolveType($objectValue, $context, ResolveInfo $info)
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return null;
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}
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public function resolveValue($objectValue, $context, ResolveInfo $info)
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{
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if (isset($this->config['resolveValue'])) {
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return ($this->config['resolveValue'])($objectValue, $context, $info);
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}
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return $objectValue;
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}
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/**
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* @throws Error
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* @throws InvariantViolation

‎src/Type/Definition/UnionType.php‎

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@@ -10,13 +10,15 @@
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/**
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* @phpstan-import-type ResolveType from AbstractType
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* @phpstan-import-type ResolveValue from AbstractType
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*
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* @phpstan-type ObjectTypeReference ObjectType|callable(): ObjectType
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* @phpstan-type UnionConfig array{
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* name?: string|null,
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* description?: string|null,
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* types: iterable<ObjectTypeReference>|callable(): iterable<ObjectTypeReference>,
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* resolveType?: ResolveType|null,
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* resolveValue?: ResolveValue|null,
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* astNode?: UnionTypeDefinitionNode|null,
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* extensionASTNodes?: array<UnionTypeExtensionNode>|null
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* }
@@ -115,6 +117,15 @@ public function resolveType($objectValue, $context, ResolveInfo $info)
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return null;
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}
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public function resolveValue($objectValue, $context, ResolveInfo $info)
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{
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if (isset($this->config['resolveValue'])) {
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return ($this->config['resolveValue'])($objectValue, $context, $info);
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}
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return $objectValue;
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}
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public function assertValid(): void
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{
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Utils::assertValidName($this->name);

‎tests/Executor/AbstractTest.php‎

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@@ -13,6 +13,7 @@
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use GraphQL\Tests\Executor\TestClasses\Cat;
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use GraphQL\Tests\Executor\TestClasses\Dog;
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use GraphQL\Tests\Executor\TestClasses\Human;
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use GraphQL\Tests\Executor\TestClasses\PetEntity;
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use GraphQL\Type\Definition\InterfaceType;
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use GraphQL\Type\Definition\ObjectType;
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use GraphQL\Type\Definition\Type;
@@ -773,4 +774,100 @@ public function testHintsOnConflictingTypeInstancesInResolveType(): void
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$error->getMessage()
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);
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}
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public function testResolveTypeAllowsModifyingObjectValue(): void
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{
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$PetType = new InterfaceType([
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'name' => 'Pet',
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'resolveType' => static function (PetEntity $objectValue): string {
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if ($objectValue->type === 'dog') {
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return 'Dog';
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}
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return 'Cat';
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},
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'resolveValue' => static function (PetEntity $objectValue) {
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if ($objectValue->type === 'dog') {
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return new Dog($objectValue->name, $objectValue->woofs);
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}
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return new Cat($objectValue->name, $objectValue->woofs);
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},
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'fields' => [
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'name' => ['type' => Type::string()],
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],
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]);
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$DogType = new ObjectType([
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'name' => 'Dog',
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'interfaces' => [$PetType],
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'fields' => [
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'name' => [
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'type' => Type::string(),
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'resolve' => fn (Dog $dog) => $dog->name,
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],
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'woofs' => [
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'type' => Type::boolean(),
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'resolve' => fn (Dog $dog) => $dog->woofs,
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],
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],
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]);
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$CatType = new ObjectType([
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'name' => 'Cat',
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'interfaces' => [$PetType],
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'fields' => [
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'name' => [
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'type' => Type::string(),
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'resolve' => fn (Cat $cat) => $cat->name,
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],
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'meows' => [
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'type' => Type::boolean(),
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'resolve' => fn (Cat $cat) => $cat->meows,
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],
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],
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]);
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$schema = new Schema([
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'query' => new ObjectType([
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'name' => 'Query',
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'fields' => [
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'pets' => [
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'type' => Type::listOf($PetType),
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'resolve' => static fn (): array => [
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new PetEntity('dog', 'Odie', true),
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new PetEntity('cat', 'Garfield', false),
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],
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],
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],
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]),
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'types' => [$CatType, $DogType],
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]);
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$query = '{
848+
pets {
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name
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... on Dog {
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woofs
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}
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... on Cat {
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meows
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}
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}
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}';
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$result = GraphQL::executeQuery($schema, $query)->toArray();
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self::assertEquals(
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[
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'data' => [
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'pets' => [
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['name' => 'Odie', 'woofs' => true],
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['name' => 'Garfield', 'meows' => false],
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],
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],
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],
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$result
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);
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}
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}

‎tests/Executor/TestClasses/PetEntity.php‎

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@@ -0,0 +1,21 @@
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<?php declare(strict_types=1);
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namespace GraphQL\Tests\Executor\TestClasses;
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final class PetEntity
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{
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/** @var 'dog'|'cat' */
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public string $type;
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public string $name;
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public bool $woofs;
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/** @param 'dog'|'cat' $type */
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public function __construct(string $type, string $name, bool $woofs)
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{
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$this->type = $type;
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$this->name = $name;
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$this->woofs = $woofs;
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}
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}

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