/**
  * Clean database.
  *
  * @param ManagerRegistry $registry
  * @param EntityManager   $om
  */
 private function cleanDatabase(ManagerRegistry $registry, EntityManager $om)
 {
     $connection = $om->getConnection();
     $mysql = $registry->getName() === 'ORM' && $connection->getDatabasePlatform() instanceof MySqlPlatform;
     if ($mysql) {
         $connection->query('SET FOREIGN_KEY_CHECKS=0');
     }
     $this->loadFixtures(array());
     if ($mysql) {
         $connection->query('SET FOREIGN_KEY_CHECKS=1');
     }
 }