Manual validation of an object with the Symfony validator component

Published on 2023-08-09 • Modified on 2023-08-09

In a previous snippet, we saw how to validate an array using the existing validator service manually. In this snippet, we manually create a validator service, and then we validate an object containing validation assertions with attributes like #[Assert\NotBlank].

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<?php

declare(strict_types=1);

namespace App\Controller\Snippet;

use App\Samples\ProductSample;
use Symfony\Component\Validator\ConstraintViolation;
use Symfony\Component\Validator\Validation;

/**
 * I am using a PHP trait to isolate each snippet in a file.
 * This code should be called from a Symfony controller extending AbstractController (as of Symfony 4.2)
 * or Symfony\Bundle\FrameworkBundle\Controller\Controller (Symfony <= 4.1).
 * Services are injected in the main controller constructor.
 */
trait Snippet267Trait
{
    public function snippet267(): void
    {
        $validator = Validation::createValidatorBuilder()
            ->enableAttributeMapping()
            ->getValidator();
        $product = new ProductSample();
        /** @var ConstraintViolation $violations */
        $violations = $validator->validate($product);
        echo 'Violations: '.PHP_EOL.$violations;

        // That's it! 😁
    }
}

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