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 si

Answer 1

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("Name‌​space\JobBundle\Entity\Job");

and $metadata should have the data you are looking for

Symfony 2.3 and above

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

Answer 2

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.