Doctrine Composite primary key foreign key - symfony

Question

I realize a web application with Symfony 2 from an existing database.
I have set up an entity with a primary key consisting of two foreign keys.
example:
Entity1 with a composite primary key: property1 (PK), property2 (PK)
Entity2 primary key consists of two foreign keys: property1 (PK FK), property2 (PK FK), propriete3 (PK)
I don't how to implement this association:
In the entity2 i do :
/**
* #ORM\ManyToOne (targetEntity = "Entity1")
* #ORM\JoinColumns ({
* #ORM\JoinColumn (name = "property1" referencedColumnName = "property1")
* #ORM\JoinColumn (name = "property2" referencedColumnName = "property2")
* #ORM\Id
* #})
*/
private $entity1;
But I get an error:
It is not possible to map entity 'ExempleBundle\Entity\Entite1' with a composite primary key as part of the primary key of another entity 'ExempleBundle\Entity\Entite2#entite1'.
How to properly handle this kind of association with Doctrine
I tried to follow this example but I do not understand : http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/composite-primary-keys.html#use-case-1-dynamic-attributes
Can you give an example of two entities with a similar case and especially on how to make a joint in this case.

Answer 1

I found a work-around that gets around the issue, by defining a separate foreign key, using the original foreign key columns as the join columns.
/** #Id #Column(...) */
protected $property1;
/** #Id #Column(...) */
protected $property2;
/** #Id #Column(...) */
protected $property3;
/**
* #ManyToOne(targetEntity="Entity1")
* #JoinColumns({
* #JoinColumn(name="property1", referencedColumnName="property1"),
* #JoinColumn(name="property2", referencedColumnName="property2")
* })
**/
protected $foreignObject;

Answer 2

It is a example that works:
<?php
namespace Project\WorkflowBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="opinion")
*/
class Opinion
{
/**
* #ORM\Id
* #ORM\ManyToOne(targetEntity="\Project\WorkflowBundle\Entity\Comision_Proyecto", inversedBy="opiniones")
*/
protected $comision;
/**
* #ORM\Id
* #ORM\ManyToOne(targetEntity="\Project\WorkflowBundle\Entity\Persona", inversedBy="opiniones")
*/
protected $persona;
/**
* #ORM\OneToMany(targetEntity="\Project\WorkflowBundle\Entity\Comentario", mappedBy="opinion")
*/
protected $comentarios;
}
the other class:
<?php
namespace Project\WorkflowBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="comentario")
*/
class Comentario
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue
*/
protected $id;
/**
* #ORM\Column(type="boolean")
*/
protected $privado;
/**
* #ORM\ManyToOne(targetEntity="\Project\WorkflowBundle\Entity\Opinion")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="comision_id", referencedColumnName="comision_id"),
* #ORM\JoinColumn(name="persona_id", referencedColumnName="persona_id")
* })
*/
protected $opinion;
}

Answer 3

Doctrine2 do not manage foreign composite keys to reference an entity with its composite primary keys
The cases where Doctrine2 manage correctly composite primary keys are mainly :
OneToMany: The associated entity (ArticleAttributes) uses as primary key, the primary key of the referenced entity (Artile) and an other self field (attribute)
Article (id, title, ...),
ArticleAttributes (#article_id, #attribute, value, ...)
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/composite-primary-keys.html#use-case-1-dynamic-attributes
ManyToMany: Join-Table with Metadata
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/composite-primary-keys.html#use-case-3-join-table-with-metadata
In your case, you want to reference an entity which hasn't got a unqiue identifier but a composite keys, Doctrine do not manage this case. You can only have composite key for association entity type.
Generally, I avoid to use composite keys for the main models. I reserved composite keys for model of association type.
So a solution is to use a primary key for your main model Entity1
Hope this helps.