WorkflowBundle/Repository/WorkflowRepository.php

<?php

namespace WorkflowBundle\Repository;

use \Doctrine\ORM\EntityRepository;

class WorkflowRepository extends EntityRepository
{

    /**
     * @param string $class
     * 
     * @return array
     */
    public function findAllByClass($class)
    {
        $results = $this->createQueryBuilder('Workflow')->getQuery()->getResult();
        foreach ($results as $key => &$result) {
            if (!in_array($class, $result->getSupport())) {
                unset($results[$key]);
            }
        }
        
        return $results;
    }

}