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Made the code of a validation example more robust #9993

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11 changes: 11 additions & 0 deletions validation/custom_constraint.rst
Original file line number Diff line number Diff line change
Expand Up @@ -59,11 +59,22 @@ The validator class is also simple, and only has one required method ``validate(

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class ContainsAlphanumericValidator extends ConstraintValidator
{
public function validate($value, Constraint $constraint)
{
// custom constraints should ignore null and empty values to allow
// other constraints (NotBlank, NotNull, etc.) take care of that
if (null === $value || '' === $value) {
return;
}

if (!is_string($value)) {
throw new UnexpectedTypeException($value, 'string');
}

if (!preg_match('/^[a-zA-Z0-9]+$/', $value, $matches)) {
// If you're using the new 2.5 validation API (you probably are!)
$this->context->buildViolation($constraint->message)
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