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+Object Mapper
+==============
+
+Symfony provides a mapper to transform a given object to another one.
+This compoent is experimental.
+
+Installation
+------------
+
+Run this command to install the ``object-mapper`` before using it:
+
+.. code-block:: terminal
+
+    $ composer require symfony/object-mapper
+
+Using the ObjectMapper Service
+------------------------------
+
+Once installed, the object mapper service can be injected in any service where
+you need it or it can be used in a controller::
+
+    // src/Controller/DefaultController.php
+    namespace App\Controller;
+
+    use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+    use Symfony\Component\HttpFoundation\Response;
+    use Symfony\Component\ObjectMapper\ObjectMapperInterface;
+
+    class DefaultController extends AbstractController
+    {
+        public function __invoke(ObjectMapperInterface $objectMapper): Response
+        {
+            // keep reading for usage examples
+        }
+    }
+
+
+Map an object to another one
+----------------------------
+
+To map an object to another one use ``map``::
+
+    use App\Entity\Book;
+    use App\ValueObject\Book as BookDto;
+
+    $book = $bookRepository->find(1);
+    $mapper = new ObjectMapper();
+    $mapper->map($book, BookDto::class);
+
+
+If you already have a target object, you can use its instance directly::
+
+    use App\Entity\Book;
+    use App\ValueObject\Book as BookDto;
+
+    $bookDto = new BookDto(title: 'An updated title');
+    $book = $bookRepository->find(1);
+    $mapper = new ObjectMapper();
+    $mapper->map($bookDto, $book);
+
+The Object Mapper source can also be a `stdClass`::
+
+    use App\Entity\Book;
+
+    $bookDto = new \stdClass();
+    $bookDto->title = 'An updated title';
+    $mapper = new ObjectMapper();
+    $mapper->map($bookDto, Book::class);
+
+Configure the mapping target using attributes
+---------------------------------------------
+
+The Object Mapper component includes a :class:`Symfony\\Component\\ObjectMapper\\Attribute\\Map` attribute to configure mapping
+behavior between objects. Use this attribute on a class to specify the
+target class::
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+
+    #[Map(target: Target::class)]
+    class Source {}
+
+Configure property mapping
+--------------------------
+
+Use the :class:`Symfony\\Component\\ObjectMapper\\Attribute\\Map` attribute on properties to configure property mapping between
+objects. ``target`` changes the target property, ``if`` allows to
+conditionally map properties::
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+
+    class Source {
+        #[Map(target: 'fullName')]
+        public string $firstName;
+
+        // when we do not want to map the lastName we can use `false`
+        #[Map(if: false)]
+        public string $lastName;
+    }
+
+When a property is not present in the target class it will be ignored.
+
+The condition mapping can also be configured as a service
+to do so implement a :class:`Symfony\\Component\\ObjectMapper\\ConditionCallableInterface`::
+
+    // src/ObjectMapper/ConditionNameCallable.php
+    namespace App\ObjectMapper;
+
+    use App\Dto\Source;
+    use Symfony\Component\ObjectMapper\ConditionCallableInterface;
+
+    /**
+     * @implements ConditionCallableInterface<Source>
+     */
+    final class ConditionNameCallable implements ConditionCallableInterface
+    {
+        public function __invoke(mixed $value, object $source): bool
+        {
+            return is_string($value);
+        }
+    }
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    use App\ObjectMapper\ConditionNameCallable;
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+
+    class Source {
+        #[Map(if: ConditionCallableInterface::class)]
+        public mixed $status;
+    }
+
+Whe you have multiple mapping targets, you can also use the target class name as a condition for property mapping::
+
+    #[Map(target: B::class)]
+    #[Map(target: C::class)]
+    class A
+    {
+        // This will map to `foo` only when the target is of type B::class
+        #[Map(target: 'somethingOnlyInB', transform: 'strtoupper', if: B::class)]
+        public string $something = 'test';
+    }
+
+
+Transform mapped values
+-----------------------
+
+Use ``transform`` to call a static function or a
+:class:`Symfony\\Component\\ObjectMapper\\TransformCallableInterface`::
+
+    // src/ObjectMapper/TransformNameCallable.php
+    namespace App\ObjectMapper;
+
+    use App\Dto\Source;
+    use Symfony\Component\ObjectMapper\TransformCallableInterface;
+
+    /**
+     * @implements TransformCallableInterface<Source>
+     */
+    final class TransformNameCallable implements TransformCallableInterface
+    {
+        public function __invoke(mixed $value, object $source): mixed
+        {
+            return sprintf('%s %s', $source->firstName, $source->lastName);
+        }
+    }
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    use App\ObjectMapper\TransformNameCallable;
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+
+    class Source {
+        #[Map(target: 'fullName', transform: TransformNameCallable::class)]
+        public string $firstName;
+    }
+
+We can also use a transformation mapping on a class, it should return the type of your mapping target::
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    #[Map(transform: [Target::class, 'newInstance'])]
+    class Source
+    {
+        public string $name = 'test';
+    }
+
+
+    // src/Dto/Target.php
+    class Target
+    {
+        public ?string $name = null;
+
+        public function __construct(private readonly int $id)
+        {
+        }
+
+        public function getId(): int
+        {
+            return $this->id;
+        }
+
+        public static function newInstance(): self
+        {
+            return new self(1);
+        }
+    }
+
+
+The ``if`` and ``transform`` parameters also accept static callbacks::
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+
+    class Source {
+        #[Map(if: 'boolval', transform: 'ucfirst')]
+        public ?string $lastName = null;
+    }
+
+The :class:`Symfony\\Component\\ObjectMapper\\Attribute\\Map` attribute works on
+classes and it can be repeated::
+
+    // src/Dto/Source.php
+    namespace App\Dto;
+
+    use App\Dto\B;
+    use App\Dto\C;
+    use App\ObjectMapper\TransformNameCallable;
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+
+    #[Map(target: B::class, if: [Source::class, 'shouldMapToB'])]
+    #[Map(target: C::class, if: [Source::class, 'shouldMapToC'])]
+    class Source
+    {
+        /**
+         * In case of a condition on a class, $value will be null
+         */
+        public static function shouldMapToB(mixed $value, object $source): bool
+        {
+            return false;
+        }
+
+        public static function shouldMapToC(mixed $value, object $source): bool
+        {
+            return true;
+        }
+    }
+
+Provide mapping as a service
+----------------------------
+
+The :class:`Symfony\\Component\\ObjectMapper\\ObjectMapperMetadataFactoryInterface` allows
+to change how mapping metadata is computed. With this interface we can create a
+`MapStruct`_ version of the Object Mapper::
+
+    // src/ObjectMapper/Metadata/MapStructMapperMetadataFactory.php
+    namespace App\Metadata\ObjectMapper;
+
+    use Symfony\Component\ObjectMapper\Attribute\Map;
+    use Symfony\Component\ObjectMapper\Metadata\ObjectMapperMetadataFactoryInterface;
+    use Symfony\Component\ObjectMapper\Metadata\Mapping;
+    use Symfony\Component\ObjectMapper\ObjectMapperInterface;
+
+    /**
+     * A Metadata factory that implements the basics behind https://mapstruct.org/.
+     */
+    final class MapStructMapperMetadataFactory implements ObjectMapperMetadataFactoryInterface
+    {
+        public function __construct(private readonly string $mapper)
+        {
+            if (!is_a($mapper, ObjectMapperInterface::class, true)) {
+                throw new \RuntimeException(sprintf('Mapper should implement "%s".', ObjectMapperInterface::class));
+            }
+        }
+
+        public function create(object $object, ?string $property = null, array $context = []): array
+        {
+            $refl = new \ReflectionClass($this->mapper);
+            $mapTo = [];
+            $source = $property ?? $object::class;
+            foreach (($property ? $refl->getMethod('map') : $refl)->getAttributes(Map::class) as $mappingAttribute) {
+                $map = $mappingAttribute->newInstance();
+                if ($map->source === $source) {
+                    $mapTo[] = new Mapping($map->source, $map->target, $map->if, $map->transform);
+
+                    continue;
+                }
+            }
+
+            // Default is to map properties to a property of the same name
+            if (!$mapTo && $property) {
+                $mapTo[] = new Mapping($property, $property);
+            }
+
+            return $mapTo;
+        }
+    }
+
+With this metadata usage, the mapping definition can be written as a service::
+
+    // src/ObjectMapper/AToBMapper
+
+    namespace App\Metadata\ObjectMapper;
+
+    use App\Dto\Source;
+    use App\Dto\Target;
+    use Symfony\Component\ObjectMapper\Attributes\Map;
+    use Symfony\Component\ObjectMapper\ObjectMapper;
+    use Symfony\Component\ObjectMapper\ObjectMapperInterface;
+
+
+    #[Map(source: Source::class, target: Target::class)]
+    class AToBMapper implements ObjectMapperInterface
+    {
+        public function __construct(private readonly ObjectMapper $objectMapper)
+        {
+        }
+
+        #[Map(source: 'propertyA', target: 'propertyD')]
+        #[Map(source: 'propertyB', if: false)]
+        public function map(object $source, object|string|null $target = null): object
+        {
+            return $this->objectMapper->map($source, $target);
+        }
+    }
+
+
+The custom metadata is injected into our :class:`Symfony\\Component\\ObjectMapper\\ObjectMapperInterface`::
+
+    $a = new Source('a', 'b', 'c');
+    $metadata = new MapStructMapperMetadataFactory(AToBMapper::class);
+    $mapper = new ObjectMapper($metadata);
+    $aToBMapper = new AToBMapper($mapper);
+    $b = $aToBMapper->map($a);
+
+.. _`MapStruct`: https://mapstruct.org/