Symfony2 get validation constraints on an entity

Question

Im working on a method to get all validation constraints of an entity (what i am trying to achieve is to return this data in JSON and apply the same constraints on client side using JQuery Validation Plugin), however im having some trouble getting the constraints, Here is my current code:

    $metadata = new \Symfony\Component\Validator\Mapping\ClassMetadata("Namespace\JobBundle\Entity\Job");
    $annotationloader = new AnnotationLoader(new AnnotationReader());
    $annotationloader->loadClassMetadata($metadata);

what i get in $metadata is an empty array for the constraints attribute, the rest ($properties and $members have only the error messages... but not the actual constraints (eg : required, integer...)).

What im a doing wrong?

Did you try $metadata = $this->container->get('validator')->getMetadataFactory()->getClassMetadata("Namespace\JobBundle\Entity\Job");? — Thomas Potaire
– Thomas Potaire, Commented Mar 18, 2013 at 23:37
just noticed that the $properties attribute actually contains a constraints array, your suggestion also gives the same result, so if you make answer i'd gladly accept it. — Youssef
– Youssef, Commented Mar 19, 2013 at 11:58

magnetik · Accepted Answer · 2017-01-05 10:28:39Z

18

I would probably use the validator service instead of instantiating a new class metadata. You never know if some classes are initialized through the service.

$metadata = $this->container
                 ->get('validator')
                 ->getMetadataFactory()
                 ->getClassMetadata("Name‌space\JobBundle\Entity\Job");

and $metadata should have the data you are looking for

Symfony 2.3 and above

$metadata = $this->container
                 ->get('validator')
                 ->getMetadataFor("Name‌space\JobBundle\Entity\Job");

edited Jan 5, 2017 at 10:28

magnetik

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answered Mar 19, 2013 at 15:25

Thomas Potaire

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2 Comments

Michał Powaga Over a year ago

+1, btw from Symfony 2.3 getClassMetadata is deprecated and getMetadataFor is recommended.

user2182349 Over a year ago

Works with Symfony 4.0

Robin Rizvi · Accepted Answer · 2013-04-26 05:03:41Z

private function getValidations()
    {
        $validator=$this->get("validator");
        $metadata=$validator->getMetadataFor(new yourentity());
        $constrainedProperties=$metadata->getConstrainedProperties();
        foreach($constrainedProperties as $constrainedProperty)
        {
            $propertyMetadata=$metadata->getPropertyMetadata($constrainedProperty);
            $constraints=$propertyMetadata[0]->constraints;
            foreach($constraints as $constraint)
            {
                //here you can use $constraint to get the constraint, messages etc that apply to a particular property of your entity
            }
        }
    }

$validator=$this->get("validator");
$metadata=$validator->getMetadataFor(new yourentity());
The object $metadata now contains all the metadata about validations that concerns your specific entity.

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