Doctrine 2 OneToOne from PFK of another OneToOne association - php

Question

I have one question. I'm using Doctrine 2.0 and i want to know if is possible to made OneToOne association by using PFK created by another OneToOne assotiation as you can see on the picture below.
My code looks like this:
User class:
/**
* #ORM\Entity()
*/
class User extends \Kdyby\Doctrine\Entities\IdentifiedEntity
{
/**
* #ORM\OneToOne(targetEntity="AllianceMember", mappedBy="user")
* var AllianceMember
*/
protected $allianceMembership;
}
AllianceMember class:
/**
* #ORM\Entity()
*/
class AllianceMember extends \Kdyby\Doctrine\Entities\BaseEntity
{
/**
* #ORM\Id
* #ORM\OneToOne(targetEntity="User", inversedBy="allianceMembership")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id", nullable=false)
* #var User
*/
protected $user;
/**
* #ORM\OneToOne(targetEntity="AllianceRole", mappedBy="allianceMember")
* var AllianceRole
*/
protected $role;
AllianceRole class:
/**
*
* #ORM\Entity()
*/
class AllianceRole extends \Kdyby\Doctrine\Entities\BaseEntity
{
/**
* #ORM\Id
* #ORM\OneToOne(targetEntity="AllianceMember", inversedBy="role")
* #ORM\JoinColumn(name="role_id", referencedColumnName="user_id", nullable=false)
* #var AllianceMember
*/
protected $allianceMember;
}
I'm getting this error, when I'm trying to get instance of User entity:
The column user_id must be mapped to a field in class App\Entity\AllianceMember since it is referenced by a join column of another class.
Is it even possible?
Thanks.

Answer 1

Yes, using mapped entities for your #Id has been possible since doctrine 2.1 see Primary key and foreign key at the same time with doctrine 2
I think you simply need to remove some of your JoinColumn statements. Since #user is already designated as your #Id, it isn't necessary to specify user_id as the JoinColumn:
/**
* #ORM\Entity()
*/
class AllianceMember extends \Kdyby\Doctrine\Entities\BaseEntity
{
/**
* #ORM\Id
* #ORM\OneToOne(targetEntity="User", inversedBy="allianceMembership")
* #var User
*/
protected $user;
/**
* #ORM\OneToOne(targetEntity="AllianceRole", mappedBy="allianceMember")
* var AllianceRole
*/
protected $role;
and
/**
*
* #ORM\Entity()
*/
class AllianceRole extends \Kdyby\Doctrine\Entities\BaseEntity
{
/**
* #ORM\Id
* #ORM\OneToOne(targetEntity="AllianceMember", inversedBy="role")
* #var AllianceMember
*/
protected $allianceMember;
}
The id of the AllianceMember is the user_id, and the id of the AllianceRole is the id of the AllianceMember, which is user_id.