通过与DQL理论联系来选择对象

Question

I have three entities: Project , RequestMatcher , and Response . Here is how they are related:

$project->getRequestMatchers(); // Project has many RequestMatchers

$requestMatcher->getActiveResponse(); // RequestMatcher has one active Response

How can i write DQL to get all active Response s for a Project ?

    $query = $this->getEntityManager()->createQuery(
        "SELECT resp FROM $responseClass resp
               JOIN $requestMatcherClass req WITH req.project = :project
               WHERE resp.id IN(req.active_response_id)"
    );

    $query->setParameter('project', $project);

I'm getting the following exception though:

[Doctrine\ORM\Query\QueryException]                                 
  [Syntax Error] line 0, col 230: Error: Expected Literal, got 'req'

I've also tried this with the same result:

    $query = $this->getEntityManager()->createQuery(
        "SELECT resp FROM $responseClass resp
               LEFT JOIN resp.requestMatcher req WITH req.project = :project
               WHERE resp IN(req.activeResponse)"
    );

This is the sql that will give me the id's

select active_response_id from (
  select active_response_id from request_matchers where project_id = 1
) t

Answer 1

I'm not convinced this is the best way to do it but i solved this with the following:

    $query = "SELECT resp FROM $responseClass resp
              WHERE resp.id IN (
                  SELECT IDENTITY(req.activeResponse) FROM $requestMatcherClass req
                  WHERE req.project = :project
              )";

Answer 2

You can also try using the QueryBuilder object, something like :

$this->getDoctrine()->getRepository('YourBundle:Project')->createQueryBuilder('p')
    ->join('p.requestMatchers', 'rm', \Doctrine\ORM\Query\Expr\Join::WITH, 'rm.project = :project')
    ->join('rm.activeReponse', 'ar')
    ->addSelect('rm.*')
    ->addSelect('ar.*')
    ->setParameter('project', $project)
    ->getQuery()
    ->execute();