Forms Symfony2：动态搜索表单

我尝试创建一个动态搜索表单，供许多实体使用。一切正常，但我需要测试所有字段以检查类型和他的条件：text=>LIKE，choice=>EQ，choice=>IN multiple=true。。。 你有什么办法吗？谢谢

public function search($Type, $search, $container)
{
    $repository = $container->getDoctrine()->getRepository('prodCMDBBundle:'.$Type);

    $queryBuilder = $repository->createQueryBuilder('a');
    $queryBuilder->join('a.customers', 'p');

    foreach ($search['docs'] as $field => $value) {

        if ($repository->getClassMetadata('prodCMDBBundle:'.$Type)->hasField($field) && $value) {
            // ******** ??? Check my field type ??? ******/
            $queryBuilder ->andWhere($queryBuilder->expr()->eq('a.'.$field, ':a_'.$field))->setParameter('a_'.$field, $value);
        }
    }

    return $queryBuilder->getQuery();
}