Doctrine - Perform select with relationship 1:N - symfony

Question

I have a number of entities (automatically generated with Symfony2 Console) that are structured as follows in the database:
The entity generated is as follows:
class Offers
{
/**
* #var string
* #Assert\Length(
* min = 5,
* max = 64,
* minMessage = "El nombre de la oferta debe de tener al menos {{ limit }} caracteres.",
* maxMessage = "El nombre de la oferta no puede superar los {{ limit }} caracteres."
* )
*/
private $name;
/**
* #var string
*/
private $description;
/**
* #var string
* #Assert\Url(message = "La url '{{ value }}' no es válida")
*/
private $url;
/**
* #var string
*/
private $img;
/**
* #var \DateTime
*/
private $dateFrom;
/**
* #var \DateTime
*/
private $dateTo;
/**
* #var \DateTime
*/
private $registered;
/**
* #var boolean
*/
private $active;
/**
* #var integer
*/
private $availableFor;
/**
* #var integer
*/
private $id;
/**
* #var \Doctrine\Common\Collections\Collection
*/
private $idState;
/**
* Constructor
*/
public function __construct()
{
$this->idState = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* Set name
*
* #param string $name
* #return Offers
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Set description
*
* #param string $description
* #return Offers
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get description
*
* #return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set url
*
* #param string $url
* #return Offers
*/
public function setUrl($url)
{
$this->url = $url;
return $this;
}
/**
* Get url
*
* #return string
*/
public function getUrl()
{
return $this->url;
}
/**
* Set img
*
* #param string $img
*/
public function setImg($img = null)
{
if ( $img != null)
$this->img = $img;
}
/**
* Get img
*
* #return string
*/
public function getImg()
{
return $this->img;
}
/**
* Set dateFrom
*
* #param \DateTime $dateFrom
* #return Offers
*/
public function setDateFrom($dateFrom)
{
$this->dateFrom = $dateFrom;
return $this;
}
/**
* Get dateFrom
*
* #return \DateTime
*/
public function getDateFrom()
{
return $this->dateFrom;
}
/**
* Set dateTo
*
* #param \DateTime $dateTo
* #return Offers
*/
public function setDateTo($dateTo)
{
$this->dateTo = $dateTo;
return $this;
}
/**
* Get dateTo
*
* #return \DateTime
*/
public function getDateTo()
{
return $this->dateTo;
}
/**
* Set registered
*
* #param \DateTime $registered
* #return Offers
*/
public function setRegistered($registered)
{
$this->registered = $registered;
return $this;
}
/**
* Get registered
*
* #return \DateTime
*/
public function getRegistered()
{
return $this->registered;
}
/**
* Set active
*
* #param boolean $active
* #return Offers
*/
public function setActive($active)
{
$this->active = $active;
return $this;
}
/**
* Get active
*
* #return boolean
*/
public function getActive()
{
return $this->active;
}
/**
* Set availableFor
*
* #param integer $availableFor
* #return Offers
*/
public function setAvailableFor($availableFor)
{
$this->availableFor = $availableFor;
return $this;
}
/**
* Get availableFor
*
* #return integer
*/
public function getAvailableFor()
{
return $this->availableFor;
}
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Add idState
*
* #param \Consolidador\PanelBundle\Entity\States $idState
* #return Offers
*/
public function addIdState(\Consolidador\PanelBundle\Entity\States $idState)
{
$this->idState[] = $idState;
return $this;
}
/**
* Remove idState
*
* #param \Consolidador\PanelBundle\Entity\States $idState
*/
public function removeIdState(\Consolidador\PanelBundle\Entity\States $idState)
{
$this->idState->removeElement($idState);
}
/**
* Get idState
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getIdState()
{
return $this->idState;
}
/**
* Set idState
* #param \Consolidador\PanelBundle\Entity\States $idState
*/
public function setIdState($idState)
{
$this->idState[] = $idState;
}
/**
* Cadena de texto a devolver.
* #return string
*/
public function __toString()
{
return $this->name;
}
It turns out that I select tenders belonging to a particular state, and what I do is this:
$dql = $em->createQuery("SELECT o FROM PanelBundle:Offers o WHERE o.idState = :state");
$dql->setParameter('state', $this->getUser()->getIdAgency()->getIdZone()->getIdState());
$offersState = $dql->getResult();
But I returned the following error:
[Semantical Error] line 0, col 43 near 'idState = :s': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected.
Does anyone has thought of something? Do you know how to consult in such institutions?
Greetings and thank you
SOLVED:
Here are the DQL queries used for offerings of a particular state and for all offers that do not belong to any (independent). There may be a more simple way, if anyone knows, you publish it.
SELECT o FROM PanelBundle:Offers o JOIN o.idState os WHERE os.id = :state
SELECT o FROM PanelBundle:Offers o WHERE o.id NOT IN (SELECT x.id FROM PanelBundle:Offers x JOIN x.idState os)

Answer 1

You should JOIN to states table.
$qb
->from('PanelBundle:Offers', 'o')
->select('o')
->join('PanelBundle:States', 's')
->andWhere('o.state = :state');
// ....