Doctrine2: как получить одну из противоположных сторонних сущностей с отношением ManyToOne для данного идентификатора

У меня есть две доктрины с отношениями ManyToOne:

/**
* @ORM\ManyToOne(targetEntity="Iballot\CmsBundle\Entity\PollingStation2", cascade={"persist"})
* @ORM\JoinColumn(nullable=false)
* @Expose
*/
private $pollingStation2;

и я хотел бы получить конкретный результат для данного идентификатора PollingStation2, и я пробую это, но не работает:

public function getPresidential($polId)
{
$qb = $this->createQueryBuilder('r');
$qb->where('r.pollingStation2 = :polling_station2_id')
->setParameter('polling_station2_id', $polId);

return $qb->getQuery()
->getResult();
}

юридические лица

namespace Iballot\CmsBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
* PollingStation2
*
* @ORM\Table()
* @ORM\Entity(repositoryClass="Iballot\CmsBundle\Entity\PollingStation2Repository")
*/
class PollingStation2
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;

/**
* @var string
*
* @ORM\Column(name="verfierNumber", type="integer", length=255, nullable=true)
*/
protected $verfierNumber;

/**
* @var string
*
* @ORM\Column(name="name", type="string", length=255)
*/
private $name;

/**
* @var string
*
* @ORM\Column(name="verifier_number", type="string", length=255)
*/
private $verifierNumber;

/**
* @var string
*
* @ORM\Column(name="address", type="string", length=255)
*/
private $address;


/**
* @ORM\OneToMany(targetEntity="Iballot\CmsBundle\Entity\PollingStation2", mappedBy="pollingStation")
*/
protected $result;

/**
* @ORM\ManyToOne(targetEntity="Iballot\CmsBundle\Entity\Constituency", cascade={"persist"})
* @ORM\JoinColumn(nullable=false)
*/
private $constituency;


/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}

public function __toString() {
return $this->getName();
}

/**
* Set name
*
* @param string $name
*
* @return PollingStation2
*/
public function setName($name)
{
$this->name = $name;

return $this;
}

/**
* Get name
*
* @return string
*/
public function getName()
{
return $this->name;
}

/**
* Set address
*
* @param string $address
*
* @return PollingStation2
*/
public function setAddress($address)
{
$this->address = $address;

return $this;
}

/**
* Get address
*
* @return string
*/
public function getAddress()
{
return $this->address;
}

/**
* Set verifierNumber
*
* @param integer $verifierNumber
*
* @return PollingStation2
*/
public function setVerifierNumber($verifierNumber)
{
$this->verifierNumber = $verifierNumber;

return $this;
}

/**
* Get verifierNumber
*
* @return integer
*/
public function getVerifierNumber()
{
return $this->verifierNumber;
}

/**
* Set verfierNumber
*
* @param integer $verfierNumber
*
* @return PollingStation2
*/
public function setVerfierNumber($verfierNumber)
{
$this->verfierNumber = $verfierNumber;

return $this;
}

/**
* Get verfierNumber
*
* @return integer
*/
public function getVerfierNumber()
{
return $this->verfierNumber;
}

/**
* Set constituency
*
* @param \Iballot\CmsBundle\Entity\Constituency $constituency
*
* @return PollingStation2
*/
public function setConstituency(\Iballot\CmsBundle\Entity\Constituency $constituency)
{
$this->constituency = $constituency;

return $this;
}


/**
* Get constituency
*
* @return \Iballot\CmsBundle\Entity\Constituency
*/
public function getConstituency()
{
return $this->constituency;
}



/**
* Constructor
*/
public function __construct()
{
$this->result = new \Doctrine\Common\Collections\ArrayCollection();
}

/**
* Add result
*
* @param \Iballot\CmsBundle\Entity\PollingStation2 $result
*
* @return PollingStation2
*/
public function addResult(\Iballot\CmsBundle\Entity\PollingStation2 $result)
{
$this->result[] = $result;

return $this;
}

/**
* Remove result
*
* @param \Iballot\CmsBundle\Entity\PollingStation2 $result
*/
public function removeResult(\Iballot\CmsBundle\Entity\PollingStation2 $result)
{
$this->result->removeElement($result);
}

/**
* Get result
*
* @return \Doctrine\Common\Collections\Collection
*/
public function getResult()
{
return $this->result;
}
}