Doctrine 2 DQL CASE WHEN in Count - mysql

Question

I have this Query in native MySQL Code
SELECT *
FROM `turn`
LEFT JOIN (
poi
) ON ( turn.id = poi.turn_id )
GROUP BY turn.id
ORDER BY count( case when poi.image = 1 then 1 else null end) DESC;
I need to rebuild this in Doctrine 2 DQL
My attempt so far is this:
SELECT t, COUNT((CASE WHEN Bundle\Entity\Poi p.image = 1 then 1 ELSE NULL END)) AS num
FROM Bundle\Entity\Turn t
JOIN t.pois p
GROUP BY t.id
ORDER BY num DESC
And im getting this error:
An exception has been thrown during the rendering of a template ("[Syntax Error] line 0, col 99: Error: Expected end of string, got '.'") in Bundle:Admin:showTurnsFiltered.html.twig at line 75.
What am i doing wrong?

Answer 1

I found it by myself after hours of trying and searching, it's working with this DQL:
$dql = 'SELECT t,
SUM(CASE WHEN p.image = 1 THEN 1 ELSE 0 END) AS numImage
FROM Bundle\Entity\Turn t
JOIN t.pois p
GROUP BY t.id
ORDER BY numImage DESC';
Important that you need to use SUM instead of COUNT

Answer 2

You need to use ResultSetMappingBuilder. It would look something like :
public function getTurn()
{
$rsm = new ResultSetMappingBuilder($this->_em);
$rsm->addRootEntityFromClassMetadata('Foo\BarBundle\Entity\Turn', 't');
$rsm->addJoinedEntityFromClassMetadata('Foo\BarBundle\Entity\Poi', 'p', 't', 'poi', array('id' => 'poi_id'));
$rsm->addScalarResult('ImageCount', 'ImageCount');
$sql = 'SELECT t.id, t.foo, t.bar,
SUM(CASE WHEN p.image = 1 then 1 else null end) ImageCount,
FROM Turn t
INNER JOIN poi p ON t.id = p.turn_id
ORDER BY ImageCount DESC';
$query = $this->_em->createNativeQuery($sql, $rsm);
return $query->getScalarResult();
}
note: you might need to change $query->getScalarResult()to $query->getResult().