How to Validate Raw Values (Scalar Values and Arrays)
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How to Validate Raw Values (Scalar Values and Arrays)
Usually you will be validating entire objects. But sometimes, you just want to validate a simple value - like to verify that a string is a valid email address. From inside a controller, it looks like this:
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// ...
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Validator\ValidatorInterface;
// ...
public function addEmail($email, ValidatorInterface $validator)
{
$emailConstraint = new Assert\Email();
// all constraint "options" can be set this way
$emailConstraint->message = 'Invalid email address';
// use the validator to validate the value
$errors = $validator->validate(
$email,
$emailConstraint
);
if (0 === count($errors)) {
// ... this IS a valid email address, do something
} else {
// this is *not* a valid email address
$errorMessage = $errors[0]->getMessage();
// ... do something with the error
}
// ...
}By calling validate() on the validator, you can pass in a raw value and
the constraint object that you want to validate that value against. A full
list of the available constraints - as well as the full class name for each
constraint - is available in the constraints reference
section.
Validation of arrays is possible using the Collection constraint:
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use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Validation;
$validator = Validation::createValidator();
$input = [
'name' => [
'first_name' => 'Fabien',
'last_name' => 'Potencier',
],
'email' => 'test@email.tld',
'simple' => 'hello',
'eye_color' => 3,
'file' => null,
'password' => 'test',
'tags' => [
[
'slug' => 'symfony_doc',
'label' => 'symfony doc',
],
],
];
$groups = new Assert\GroupSequence(['Default', 'custom']);
$constraint = new Assert\Collection([
// the keys correspond to the keys in the input array
'name' => new Assert\Collection([
'first_name' => new Assert\Length(['min' => 101]),
'last_name' => new Assert\Length(['min' => 1]),
]),
'email' => new Assert\Email(),
'simple' => new Assert\Length(['min' => 102]),
'eye_color' => new Assert\Choice([3, 4]),
'file' => new Assert\File(),
'password' => new Assert\Length(['min' => 60]),
'tags' => new Assert\Optional([
new Assert\Type('array'),
new Assert\Count(['min' => 1]),
new Assert\All([
new Assert\Collection([
'slug' => [
new Assert\NotBlank(),
new Assert\Type(['type' => 'string'])
],
'label' => [
new Assert\NotBlank(),
],
]),
new CustomUniqueTagValidator(['groups' => 'custom']),
]),
]),
]);
$violations = $validator->validate($input, $constraint, $groups);The validate() method returns a ConstraintViolationList
object, which acts just like an array of errors. Each error in the collection
is a ConstraintViolation object,
which holds the error message on its getMessage() method.
