Error mapping doctrine on OneToOne bidirectional relation - symfony

Question

I'm trying to create an entity that is connected with another entity 1:1. The whole point is that Equip has to have an Estadi, and just one. I can update the schema correctly, the database is okay, but on the webpage debugger appears a mapping error.
The association AppBundle\Entity\Equip#estadi refers to the inverse
side field AppBundle\Entity\Estadi#nom which is not defined as
association.
The association AppBundle\Entity\Equip#estadi refers to the inverse
side field AppBundle\Entity\Estadi#nom which does not exist
This is entity Estadi:
/**
* #ORM\Entity
* #ORM\Table(name="estadis")
*/
class Estadi{
/**
* #ORM\Column(type="string",length=30)
* #ORM\OneToOne(targetEntity="Equip",mappedBy="estadi",cascade={"persist"})
* #ORM\Id
*/
protected $nom;
/**
* #ORM\Column(type="integer")
*/
protected $aforament;
/**
* #ORM\Column(type="integer")
*/
protected $num_portes;
/**
* #ORM\Column(type="string",length=50)
*/
protected $direccio;
/**
* #ORM\Column(type="string", length=4)
*/
protected $any_construccio;
/**
* #ORM\Column(type="string", length=30)
*/
protected $nom_aficio;
}
This is Entity Equip:
/**
* #ORM\Entity
* #ORM\Table(name="equips")
*/
class Equip{
/**
* #ORM\Column(type="string",length=30)
* #ORM\Id
*/
protected $nom;
/**
* #ORM\Column(type="integer")
*/
protected $punts_lliga;
/**
* #ORM\Column(type="integer")
*/
protected $num_jugadors;
/**
* #ORM\OneToOne(targetEntity="Estadi",inversedBy="nom")
* #ORM\JoinColumn(name="nom_estadi",referencedColumnName="nom",onDelete="SET NULL")
*/
protected $estadi;
/**
* #ORM\OneToOne(targetEntity="Entrenador",inversedBy="nom")
* #ORM\JoinColumn(name="nom_entrenador",referencedColumnName="nom",onDelete="SET NULL")
*/
protected $entrenador;
/**
* #ORM\ManyToOne(targetEntity="Lliga",inversedBy="equips")
* #ORM\JoinColumn(name="nom_lliga",referencedColumnName="nom",onDelete="SET NULL")
*/
protected $lliga;
/**
* #ORM\OneToMany(targetEntity="Jugador",mappedBy="nom_equip")
*/
protected $jugadors;
public function __construct(){
$this->jugadors = new ArrayCollection();
}
}

Answer 1

When you define the #OneToOne annotation, it should not be on your primary key. Either the owning entity should contain a single association (unidirectional), or each entity should contain an association to the other - as entities, not connected to a primary key.
Your Equip mapping should instead look like this:
/**
* #ORM\OneToOne(targetEntity="Estadi", inversedBy="equip")
* #ORM\JoinColumn(name="nom_estadi", referencedColumnName="nom")
*/
protected $estadi;
public function setEstadi(Estadi $estadi)
{
$this->estadi = $estadi;
return $this;
}
public function getEstadi()
{
return $this->estadi;
}
Your Estadi mapping should instead look like this:
/**
* #OneToOne(targetEntity="Equip", mappedBy="estadi")
*/
protected $equip;
public function getEquip(Equip $equip)
{
return $this->equip;
}
I removed the cascade and onDelete, because if you're handling everything through Doctrine it should handle that for you automatically, but you still might have a use for them. I also only put the setter on the owning entity from the way you described, but you could put it back on your Estadi entity as well - that's up to you.