subset symfony validator

CreateProductRequest.php

<?php

namespace AppBundle\Rest\Request;

use AppBundle\Validator\Constraints\Subset;
use JMS\Serializer\Annotation as Serializer;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * Class CreateProductRequest
 * @package AppBundle\Rest\Request
 */
class CreateProductRequest {
	/**
	 * @var int[]
	 * @Assert\NotBlank()
	 * @Subset(multiple=true, entityClass="AppBundle\Entity\Category", repositoryMethod="getCategoriesIDs")
	 * @Serializer\Type(name="array<int>")
	 */
	public $category;
}

services.yml

    app.dto_validator.subset:
        class: AppBundle\Validator\Constraints\SubsetValidator
        tags:
          - { name: validator.constraint_validator, alias: 'app.dto_validator.subset' }
        arguments: ['@doctrine']

Subset.php

<?php

namespace AppBundle\Validator\Constraints;

use Symfony\Component\Validator\Constraints\Choice;

/**
 * Constraint for the Subset Validator
 * расширеная версия choice, использующая репозиторий как источник choices.
 * для использования надо указать класс сущности для получения репозитория и метод для получения данных
 *
 * @Annotation
 * @Target({"PROPERTY"})
 *
 */
class Subset extends Choice {
	public $service = 'app.dto_validator.subset';
	public $entityClass;
	public $repositoryMethod;
	
	/**
	 * The validator must be defined as a service with this name.
	 *
	 * @return string
	 */
	public function validatedBy() {
		return $this->service;
	}
	
	public function getRequiredOptions() {
		return array_merge( [
			'entityClass',
			'repositoryMethod' ], parent::getRequiredOptions() );
	}
	
}

SubsetValidator.php

<?php

namespace AppBundle\Validator\Constraints;

use Doctrine\Common\Persistence\ManagerRegistry;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\Constraints\ChoiceValidator;
use Symfony\Component\Validator\Exception\InvalidOptionsException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class SubsetValidator extends ChoiceValidator {
	private $registry;
	
	public function __construct( ManagerRegistry $registry ) {
		$this->registry = $registry;
	}
	
	public function validate( $value, Constraint $constraint ) {
		if ( ! $constraint instanceof Subset ) {
			throw new UnexpectedTypeException( $constraint, __NAMESPACE__ . '\Subset' );
		}
		if ( ! class_exists( $constraint->entityClass ) ) {
			throw new InvalidOptionsException( "Constraint should specify existing entity class",
				[ 'entityClass' => $constraint->entityClass ] );
		}
		$repo = $this->registry->getRepository( $constraint->entityClass );
		if ( ! method_exists( $repo, $constraint->repositoryMethod ) ) {
			throw new InvalidOptionsException( "Constraint should specify existing repository method", [
				'entityClass'      => $constraint->entityClass,
				'repositoryMethod' => $constraint->repositoryMethod ] );
		}
		
		$constraint->choices = call_user_func([$repo, $constraint->repositoryMethod]);
		parent::validate( $value, $constraint );
	}
	
}