doctrine composite key and one to many - symfony

Question

I use Symfony 2.8. I have two table and in both the primary key is composed by 3 columns:
id, tipo_corso, comune
02, it, devi
01, en, capi
09, es, file
Obviously the two table have other different columns. I can't change the primary key by use only one or two columns. For one record in StranieriCRS table there are many record in EsoneroLingua table (OneToMany):
First entity:
class StranieriCRS
{
/**
* #ORM\Column(type="string")
* #ORM\Id
*/
private $id;
/**
* #ORM\Column(type="string")
* #ORM\Id
*/
private $tipo_corso;
/**
* #ORM\Column(type="string")
* #ORM\Id
*/
private $comune;
public function __construct($id, $tipo_corso, $comune)
{
$this->id = $id;
$this->tipo_corso = $tipo_corso;
$this->comune = $comune;
$this->esonerolingua = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* #ORM\OneToMany(targetEntity="EsoneroLingua", mappedBy="stranieriCRS", fetch="EAGER")
*/
private $esonerolingua;
/**
* Get esonerolingua
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getEsonerolingua()
{
return $this->esonerolingua;
}
Second entity:
class EsoneroLingua
{
/**
* #ORM\Column(type="string")
* #ORM\Id
*/
private $id;
/**
* #ORM\Column(type="string")
* #ORM\Id
*/
private $tipo_corso;
/**
* #ORM\Column(type="string")
* #ORM\Id
*/
private $comune;
public function __construct($id, $tipo_corso, $comune)
{
$this->id = $id;
$this->tipo_corso = $tipo_corso;
$this->comune = $comune;
}
/**
* #ORM\ManyToOne(targetEntity="StranieriCRS", inversedBy="esonerolingua")
* #ORM\JoinColumns(
* #ORM\JoinColumn(name="id", referencedColumnName="id"),
* #ORM\JoinColumn(name="tipo_corso", referencedColumnName="tipo_corso"),
* #ORM\JoinColumn(name="comune", referencedColumnName="comune"),
* )
*/
private $stranieriCRS;
The problem occur when I want get the StranieriCRS object because he give me as result only one result...seems like a OneToOne relation.
My Controller:
$sql = $entityManager->createQuery("
SELECT c
FROM AppBundle:EsoneroLingua c
WHERE c.id = '1546871' and c.tipo_corso = 'C' and c.comune = '7868'
");
$test = $sql->getResult();
In $test I was expect N record of EsoneroLingua with the same record StranieriCRS but I get only one EsoneroLingua with the correct StranieriCRS object. Seems work like OneToOne relation...why? Plus if I made dump($sql->getSql()); I obtain the raw sql...I try to use it directly in my db and he give me the right result. Is it a Doctrine bug?

Answer 1

To make a bidirectionnal One-To-Many, specify the JoinColumns only in the Many-To-One side.
So, in StranieriCRS, remove the following lines :
* #ORM\JoinColumns(
* #ORM\JoinColumn(name="id", referencedColumnName="id"),
* #ORM\JoinColumn(name="tipo_corso", referencedColumnName="tipo_corso"),
* #ORM\JoinColumn(name="comune", referencedColumnName="comune"),
* )
And just let Doctrine guess the columns with the inversedBy and mappedBy attributes.
For more information on the mappings, see this page.