How to Validate Raw Values (Scalar Values and Arrays)
Edit this pageHow to Validate Raw Values (Scalar Values and Arrays)
Usually you will be validating entire objects. But sometimes, you 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,
$emailConstraint
);
if (!$errors->count()) {
// ... 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 like an array of errors. Each error in the collection
is a ConstraintViolation object,
which holds the error message on its getMessage() method.
Note
When using groups with the
Collection constraint, be sure to
use the Optional constraint when appropriate as explained in its
reference documentation.
