Custom constraint validator doesn't allow dependency injection - symfony

Question

My constraint:
<?php
declare(strict_types=1);
namespace App\Infrastructure\Domain\Model\Company;
use Symfony\Component\Validator\Constraint;
#[\Attribute]
class ContainsUnsupportedSymbols extends Constraint
{
public string $message = 'The phone "{string}" contains an illegal characters. It can only contain numbers and/or + sign.';
public string $mode;
}
And my validator:
<?php
namespace App\Infrastructure\Domain\Model\Company;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
use Symfony\Component\Validator\Exception\UnexpectedValueException;
use Symfony\Contracts\Translation\TranslatorInterface;
class ContainsUnsupportedSymbolsValidator extends ConstraintValidator
{
private TranslatorInterface $translator;
public function __construct(
TranslatorInterface $translator
)
{
}
public function validate($value, Constraint $constraint)
{
if (!$constraint instanceof ContainsUnsupportedSymbols) {
throw new UnexpectedTypeException($constraint, ContainsUnsupportedSymbols::class);
}
// custom constraints should ignore null and empty values to allow
// other constraints (NotBlank, NotNull, etc.) to take care of that
if (null === $value || '' === $value) {
return;
}
if (!is_string($value)) {
// throw this exception if your validator cannot handle the passed type so that it can be marked as invalid
throw new UnexpectedValueException($value, 'string');
}
if (!preg_match('/^\+?[0-9]{3}-?[0-9]{6,12}$/', $value, $matches)) {
// the argument must be a string or an object implementing __toString()
$this->context->buildViolation(
$this->translator->trans($constraint->message, ['{{ string }}', $value])
)->addViolation();
}
}
}
This is where I use my constraint:
'phone' => [
new Assert\NotBlank(),
new Assert\Length(
min: 1,
max: 255,
),
new ContainsUnsupportedSymbols()
],
I have to translate the error message but error is thrown because of the constructor not passed parameter.
Error:
Too few arguments to function
App\Infrastructure\Domain\Model\Company\ContainsUnsupportedSymbolsValidator::__construct(),
0 passed in
/var/www/html/vendor/symfony/validator/ContainerConstraintValidatorFactory.php
on line 52 and exactly 1 expected

Answer 1

You forgot to use your constructor to set the value of $translator
Edit your __construct method:
private TranslatorInterface $translator;
public function __construct(
TranslatorInterface $translator
)
{
$this->translator = $translator;
}