Example of symfony/validator integration in SlimPHP

1

Hi! Does anyone have an example of how to integrate symfony/validator into SlimPHP using DTO classes?

2

Hi! As far as I know the Symfony validator only supports arrays for validation.

Here is a simple example:

 use Symfony\Component\Validator\Constraints as Assert; use Symfony\Component\Validator\Exception\ValidationFailedException; use Symfony\Component\Validator\Validation; $array = [ 'title' => 'Test', 'count' => 0, 'demo' => ['one', 'two', 'three'], 'box' => true, ]; $validator = Validation::createValidator(); $constraints = new Assert\Collection( [ 'title' => new Assert\Length(['min' => 6]), 'count' => new Assert\Type('integer'), 'demo' => new Assert\Type('array'), 'box' => new Assert\Type('boolean'), ] ); $violations = $validator->validate($array, $constraints); if ($violations->count()) { throw new ValidationFailedException('Please check your input', $violations); }

If you try to pass an object it will not work:

class ExampleDto { public string $title; public int $count; public array $demo; public bool $box; } $dto = new ExampleDto(); $dto->title = 'Test'; $dto->demo = ['one', 'two', 'three']; $dto->box = true; $dto->count = 1; // ... // Exception: This value should be of type array|(Traversable&ArrayAccess). $violations = $validator->validate($dto, $constraints);
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3

Hi! As far as I know the Symfony validator only supports arrays for validation.

Actually it is not true.

Consider your validation middleware:

use Symfony\Component\Validator\Validation; $validator = Validation::createValidatorBuilder() ->addMethodMapping('loadValidatorMetadata') ->getValidator(); $errors = $validator->validate($dto);

And your dto:

use Symfony\Component\Validator\Constraints; use Symfony\Component\Validator\Mapping\ClassMetadata; class Dto { private ?int $userId = null; public function getUserId(): ?int { return $this->userId; } public function setUserId(?int $userId): void { $this->userId = $userId; } /** * @return array<int, mixed> */ protected static function constraintsUserId(): array { return [ new Constraints\Type('int'), ]; } /** * @var string[] $fieldsByModes */ protected static array $fieldsByModes = [ 'userId', ]; public static function loadValidatorMetadata(ClassMetadata $metadata): void { foreach (self::$fieldsByModesas as $field) { $metadata->addPropertyConstraints($field, self::{'constraints' . ucfirst($field)}()); } } }

Should work like a charm.

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