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. This is actually pretty easy to do. From inside a controller, it looks like this:
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// ...
use Symfony\Component\Validator\Constraints as Assert;
// ...
public function addEmailAction($email)
{
$emailConstraint = new Assert\Email();
// all constraint "options" can be set this way
$emailConstraint->message = 'Invalid email address';
// use the validator to validate the value
$errorList = $this->get('validator')->validate(
$email,
$emailConstraint
);
if (0 === count($errorList)) {
// ... this IS a valid email address, do something
} else {
// this is *not* a valid email address
$errorMessage = $errorList[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.
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.
