Doctrine query to search entities based on related entity field - symfony

Question

I've ManyToOne relationship in doctrine (Many results to One PollingStation):
/**
* #ORM\ManyToOne(targetEntity="Iballot\CmsBundle\Entity\PollingStation2", inversedBy="results", cascade={"persist"})
* #ORM\JoinColumn(nullable=false)
* #Expose
*/
private $pollingStation2;
I'd like search for all the result that belong to the polling Station that have a name similar to a key word. I try the following method but it does not work:
public function getForSearch($keyWord)
{
$query = $this->_em->createQueryBuilder();
$query
->select('r')
->from('IballotCmsBundle:Result', 'r')
->where($query->expr()->like('p.pollingStation2', $query->expr()->literal('%' . $keyWord . '%')))
//->orderBy('p.', 'ASC')
->getQuery()
->setParameter('keyWord', '%'.$keyWord.'%');
return $query->getQuery()->getResult();
}
I get the following error
[Semantical Error] line 0, col 48 near 'pollingStation2': Error:
Invalid PathExpression. Must be a StateFieldPathExpression.

Answer 1

As said by #Cerad (one more time), you need a JOIN to make the associated entity available while building your query.
Try this :
$query = $this->_em->createQueryBuilder();
$query
->select('r')
->from('IballotCmsBundle:Result', 'r')
->leftJoin('r.pollingStation2', 'p') // The missing join
->where('p.name LIKE :keyword') // where p.name like %keyword%
->setParameter('keyword', '%'.$keyword.'%')
->orderBy('p.name', 'ASC') // order by p.name ASC
->getQuery()
return $query->getResult();
BTW I fixed your orderBy, simplified your where and fixed the keyword parameter that is wrongly defined.

Answer 2

Try putting this method in your Result EntityRepository class:
public function getForSearch($keyWord)
{
$query = $this->createQueryBuilder('r');
$query
->join('r.pollingStation2', 'p')
->where('p.name LIKE :keyword')
->setParameter('keyword', '%' . $keyWord . '%')
//->orderBy('p.', 'ASC')
;
return $query->getQuery()->getResult();
}