Symfony2: Doctrine subquery in the WHERE clause including a LIMIT - symfony

Question

I'm trying to convert this SQL into either DQL or whatever the query builder variant would look like.
select *
from project_release r
where (select s.title as status_name
from release_status_log l
left join release_status s
on l.release_status_id = s.id
where l.release_id = r.id
order by l.created_at desc
limit 1
) not in ('Complete', 'Closed')
;
From inside the repository class for the Release entity, I've tried this
return $this->getEntityManager()->createQuery("
select r.*
from MyBundle:Release r
where (select s.title
from MyBundle:ReleaseStatusLog l
join l.status s
where l.release = r
order by l.createdAt desc
limit 1
) IN ('Complete','Closed')
order by r.release_date ASC
limit 10
")->getArrayResult();
Which gives the error
[Syntax Error] line 0, col 265: Error: Expected
Doctrine\ORM\Query\Lexer::T_CLOSE_PARENTHESIS, got 'limit'
Which is referring to the limit 1 in the subquery.
So then I tried this
return $this
->createQueryBuilder('r')
->select('r.*')
->where("(select s.title
from MyBundle:ReleaseStatusLog l
join l.status s
where l.release = r
order by l.created_at desc
limit 1
) $inClause ('Complete', 'Closed')
")
->setMaxResults( $limit )
->orderBy('release_date', 'ASC')
->getQuery()
->getArrayResult()
;
Which gives the same error. How can I execute a subquery limited to 1 row per row in the parent query?
Symfony 2.0.15
Doctrine 2.1.7
PHP 5.3.3
MySQL 5.1.52

Answer 1

I have a solution for this now. I ended up falling back on the native query system with the result set mapping from the entity in questions.
It's not a great solution, but it works and until I see another solution, it's the only option with this type of WHERE clause.
Here's what my finder method looks like now
/**
* Finds Releases by their current status
*
* #param array $statuses White-list of status names
* #param boolean $blackList Treat $statuses as a black-list
* #param integer $limit Limit the number of results returned
* #param string $order Sort order, ASC or DESC
*
* #throws \InvalidArgumentException
*
* #return array <Release>
*/
public function findByCurrentStatus( array $statuses, $blackList=false, $limit=null, $order='ASC' )
{
if ( empty( $statuses ) )
{
throw new \InvalidArgumentException( "Must provide at least one status" );
}
$inClause = $blackList ? 'not in' : 'in';
$rsm = new ResultSetMappingBuilder($this->getEntityManager());
$rsm->addRootEntityFromClassMetadata('MyBundle:Release', 'r');
$SQL = "
select *
from project_release r
where (select s.title as status_name
from release_status_log l
left join release_status s
on l.release_status_id = s.id
where l.release_id = r.id
order by l.created_at desc
limit 1
) $inClause ('" . implode( "','", $statuses ) . "')
order by r.release_date $order
";
if ( $limit )
{
$SQL .= " limit $limit";
}
return $this
->getEntityManager()
->createNativeQuery( $SQL, $rsm )
->getResult()
;
}
I kind of loathed going back to building a query as a string, but oh well. Oh, and for you eagle-eyes, $statuses does not come from user data, so no SQL injection vulnerabilities here ;)

Answer 2

In addition to your Native SQL solution, you can create two queries using DQL within a single repository method.
Some adjustment may be required but you could try this:
public function findCompletedReleases()
{
$em = $this->getEntityManager();
$dqlSubQuery = <<<SQL
SELECT
s.title status_name
FROM
Acme\MyBundle\Entity\ReleaseStatus s,
Acme\MyBundle\Entity\ReleaseStatusLog l,
Acme\MyBundle\Entity\Release r
WHERE
l.release = r.id AND
l.status = s.id
ORDER BY l.createdAt DESC
SQL;
$statusName = $em->createQuery($dqlSubQuery)
->setMaxResults(1)
->getSingleScalarResult();
$dql = <<<SQL
SELECT
r
FROM
Acme\MyBundle\Entity\Release r
WHERE
:status_name IN ('Complete','Closed')
ORDER BY r.release_date ASC
SQL;
$q = $em->createQuery($dql)
->setParameters(array('status_name' => $statusName))
->setMaxResults(10);
return $q->getArrayResult();
}