Symfony2 - Custom validator and dependancy injection

Question

I am trying to use dependancy injection for a custom validator, in order to be able to use the entityManager.

I followed the Symfony Example: Dependency Injection , but I am allways getting this error message:

FatalErrorException: Error: Class 'isdoi' not found in /home/milos/workspace/merrin3/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Validator/ConstraintValidatorFactory.php line 68

Here are my classes:

1. The IsDOI class:

    <?php
    namespace Merrin\MainBundle\Validator\Constraints;
    use Symfony\Component\Validator\Constraint;

    /**
     * @Annotation
    */
    class IsDOI extends Constraint
    {
    public $message_publisher_DOI = 'The Publisher DOI abbreviation does not correspond to the DOI you filled in !';
    public $message_journal_DOI = 'No journal found with the DOI you filled in !';
    public $journal;
    public $doiAbbreviation;

     public function validatedBy() {
            return "isdoi";
        }

        public function getTargets()
        {
            return self::CLASS_CONSTRAINT;
        }
    }

2. The IsDOIValidator class:

<?php

namespace Merrin\MainBundle\Validator\Constraints;

use Doctrine\ORM\EntityManager;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class IsDOIValidator extends ConstraintValidator
{
    private $entityManager;

    public function __construct(EntityManager $entityManager)
    {
    $this->entityManager = $entityManager;
    }

    public function validate($value, Constraint $constraint)
    {       
        $em_mdpipub = $this->entityManager('mdpipub');
        //Do some tests here...

    }
}

3. Service:

merrin.main.validator.isdoi:
    class:  Merrin\MainBundle\Validator\Constraints\IsDOIValidator
    arguments: 
        entityManager: "@doctrine.orm.entity_manager"

Where am I wrong? Thank you for your help.

Answer 1

You have wrong service file, when You add tags and alias you could use "isdoi" name

merrin.main.validator.isdoi:
    class:  Merrin\MainBundle\Validator\Constraints\IsDOIValidator
    arguments: 
        entityManager: "@doctrine.orm.entity_manager"
    tags:
        - { name: validator.constraint_validator, alias: isdoi }

Answer 2

You're telling Symfony2 that the validator class for your constraint is isdoi ( validateBy method ). However, your validator is IsDOIValidator .

You must use :

public function validateBy()
{
    return "IsDOIValidator";
}

However, if your Constraint class name is IsDOI , Symfony will automatically look for IsDOIValidator as a ConstraintValidator . The default behavior for validateBy is to append "Validator" to the constraint name, and look for the class with this name. So if you do not overload validateBy , Symfony2 will automatically search for IsDOIValidator .