Doctrine 2 DQL CASE WHEN in Count

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().