Convert an array of objects into an array of DTOs - php

Question

I am currently working on a HMS project (Hotel Management System). I am currently stucked in implementing a DTO based functionality in Symfony 5. The following from below is my HotelMapper.php file where I would like to build a method which transforms the Array of Hotels into an Array of DTOs so I can pass them in the Hotel Controller later on and for this I would like to use the objects from the dtoToHotel() function. I already created the DTO (setters & getters).
namespace App\Transformer;
use App\DTO\HotelDTO;
use App\Entity\HotelEntity;
class HotelMapper
{
public $hotel;
public function dtoToHotel(HotelDTO $hotelDTO, Hotel $hotel) : HotelEntity
{
$hotel->setId($hotelDTO->getId());
$hotel->setName($hotelDTO->getName());
$hotel->setLocation($hotelDTO->getLocation());
$hotel->setEmployees($hotelDTO->getEmployees());
$hotel->setAvailability($hotelDTO->getAvailability());
$hotel->setFacility($hotelDTO->getFacility());
$hotel->setPhoto($hotelDTO->getPhoto());
$hotel->setDescription($hotelDTO->getDescription());
$hotel->setEarnings($hotelDTO->getEarnings());
}
public function hotelToDto(HotelEntity $hotel)
{
return HotelDTO(
$hotel->getId(),
$hotel->getName(),
$hotel->getLocation(),
$hotel->getEmployees(),
$hotel->getAvailability(),
$hotel->getFacility(),
$hotel->getPhoto(),
$hotel->getDescription(),
$hotel->getEarnings()
);
}
public function transformHotelsArrayToDTO()
{
/* Code here */
}
}
The code from below is my HotelController where I would like to update the following line $hotels = $this->hotelRepository->findAll() inside the showAllHotels() function by passing the DTO in here. Any help is much appreciated!
class HotelController extends AbstractController
{
/**
* #var HotelRepository
*/
public $hotelRepository;
public function __construct(HotelRepository $hotelRepository)
{
$this->hotelRepository = $hotelRepository;
}
/**
* #Route (path="/", methods={"GET"})
*/
public function index(): Response
{
return $this->render('index/index.html.twig');
}
/**
* #Route (path="/hotel-management", methods={"GET"})
*/
// It does populate the table with the hotels from the DB
public function showAllHotels(): Response
{
$hotels = $this->hotelRepository->findAll();
return $this->render('hotel-management/hotel-management.html.twig', array('hotels' => $hotels));
}
}

Answer 1

Inject HotelMapper transformer to your controller and then pass findAll's result to this function:
public function transformHotelsArrayToDTO(array $items): array
{
if (empty($items) or is_null($items)) {
return [];
}
return array_map([$this, 'hotelToDto'], $items);
}