Doctrine 2 overriding many to one association - php

Question

Is it possible to override #ManyToOne(targetEntity)?
I read this Doctrine documentation page, but it doesn't mention how to override targetEntity.
Here's my code:
namespace AppBundle\Model\Order\Entity;
use AppBundle\Model\Base\Entity\Identifier;
use AppBundle\Model\Base\Entity\Product;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Mapping\AttributeOverrides;
use Doctrine\ORM\Mapping\AttributeOverride;
/**
* Class OrderItem
*
*
* #ORM\Entity
* #ORM\Table(name="sylius_order_item")
* #ORM\AssociationOverrides({
* #ORM\AssociationOverride(
* name="variant",
* joinColumns=#ORM\JoinColumn(
* name="variant", referencedColumnName="id", nullable=true
* )
* )
* })
*/
class OrderItem extends \Sylius\Component\Core\Model\OrderItem
{
/**
* #var
* #ORM\ManyToOne(targetEntity="AppBundle\Model\Base\Entity\Product")
*/
protected $product;
/**
* #return mixed
*/
public function getProduct()
{
return $this->product;
}
/**
* #param mixed $product
*/
public function setProduct($product)
{
$this->product = $product;
}
}
I was able to to override the definition for the "variant" column and set this column to null, but I can't figure it out how to change the targetEntity.

Answer 1

As described in the doc, you cannot change the type of your association:
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/inheritance-mapping.html#association-override
BUT, you can define a targetEntity as an interface (that's the default sylius conf it seems),
targetEntity="AppBundle\Entity\ProductInterface"
Extends the original one in your Interface file
namespace AppBundle\Entity;
use Sylius\Component\Core\Model\ProductInterface as BaseProductInterface;
interface ProductInterface extends BaseProductInterface {}
And add the mapping in your configuration
doctrine:
orm:
resolve_target_entities:
AppBundle\Entity\ProductInterface: AppBundle\Entity\Product
It's described here: http://symfony.com/doc/current/doctrine/resolve_target_entity.html
Hope it helps

Answer 2

I didn't find a way to override the targetEntity value of an association when using annotations, but it is possible when using PHP mapping (php or staticphp in Symfony).
https://www.doctrine-project.org/projects/doctrine-orm/en/current/reference/php-mapping.html
We can create a function:
function updateAssociationTargetEntity(ClassMetadata $metadata, $association, $targetEntity)
{
if (!isset($metadata->associationMappings[$association])) {
throw new \LogicException("Association $association not defined on $metadata->name");
}
$metadata->associationMappings[$association]['targetEntity'] = $targetEntity;
}
and use it like this:
updateAssociationTargetEntity($metadata, 'product', AppBundle\Model\Base\Entity\Product::class);
That way, when Doctrine loads the metadata for the class AppBundle\Model\Order\Entity\OrderItem, it first loads the parent (\Sylius\Component\Core\Model\OrderItem) metadata, and then it loads the PHP mapping for the child class where we override the association mapping that was set when loading the parent class metadata.