Doctrine 2 multiple mappedBy? - php

Question

I've got a problem setting up the Doctrine mapping correctly.
I have a CashRegister Entity which has a bin location and a return bin location. Both locations are from the same Type (BinLocation Entity).
Outgoing from CashRegister, CashRegister->getBinLocations() and CashRegister->getReturnBinLocations() are working fine, but how can I achieve that BinLocation->getCashRegisters() returns all CashRegister Entities that are referenced (binLocation + returnBinLocation)?
/**
* CashRegister
*
* #ORM\Table(name="cash_registers")
* #ORM\Entity
* #ORM\HasLifecycleCallbacks
*/
class CashRegister
{
...
/**
* #var BinLocation
*
* #ORM\ManyToOne(targetEntity="BinLocation", inversedBy="cashRegisters")
* #ORM\JoinColumn(name="bin_location_id", referencedColumnName="id")
*/
private $binLocation;
/**
* #var BinLocation
*
* #ORM\ManyToOne(targetEntity="BinLocation", inversedBy="cashRegisters")
* #ORM\JoinColumn(name="return_bin_location_id", referencedColumnName="id")
*/
private $returnBinLocation;
/**
* #return BinLocation
*/
public function getBinLocation()
{
return $this->binLocation;
}
/**
* #return BinLocation
*/
public function getReturnBinLocation()
{
return $this->returnBinLocation;
}
...
}
/**
* BinLocation
*
* #ORM\Table(name="bin_locations")
* #ORM\Entity
* #ORM\HasLifecycleCallbacks
*/
class BinLocation
{
...
/**
* #var CashRegister[]
*
* #ORM\OneToMany(targetEntity="CashRegister", mappedBy="binLocation") <= Here is the problem, in this case mappedBy need to be an array [binLocation, returnBinLocation]
*/
private $cashRegisters;
/**
* #return CashRegister[]
*/
public function getCashRegisters()
{
return $this->cashRegisters;
}
...
}

Answer 1

The simple answer is that you cannot. mappedBy accepts only one argument.
The solution to achieve what you want is however simple. Create a second property in BinLocation called: cashRegisters2 as follows:
/**
* #var CashRegister[]
*
* #ORM\OneToMany(targetEntity="CashRegister", mappedBy="binLocation")
*/
private $cashRegisters;
/**
* #var CashRegister[]
*
* #ORM\OneToMany(targetEntity="CashRegister", mappedBy="binLocation")
*/
private $cashRegisters2;
Then merge the Collections in your getCashRegisters method.
/**
* #return CashRegister[]
*/
public function getCashRegisters()
{
return new ArrayCollection(
array_merge($cashRegisters->toArray(), $cashRegisters2->toArray())
);
}
Also change your CashRegister mappings accordingly:
/**
* #var BinLocation
*
* #ORM\ManyToOne(targetEntity="BinLocation", inversedBy="cashRegisters")
* #ORM\JoinColumn(name="bin_location_id", referencedColumnName="id")
*/
private $binLocation;
/**
* #var BinLocation
*
* #ORM\ManyToOne(targetEntity="BinLocation", inversedBy="cashRegisters2")
* #ORM\JoinColumn(name="return_bin_location_id", referencedColumnName="id")
*/
private $returnBinLocation;
Note: I did not test the code. This example is to server guide only.
Note2: The ArrayCollection merge was inspired from here: https://stackoverflow.com/a/16871539/2853903

Answer 2

I have also searched for solutions and made a patch for Doctrine so you can have custom_attributes linked to a variety of entity types.
Doctrine 2.6: https://github.com/danielbeeke/doctrine2/commit/2d8530176b872cb490c5c88b8c8e17d8d0091388
Doctrine 2.7: https://github.com/danielbeeke/doctrine2/commit/5bde696848ea9fe7035fadc4d46baa4c0d51f3a2
/**
* #Entity
* #Table(name="product")
* #HasLifecycleCallbacks
**/
class Product {
/**
* One Product has Many Attributes.
*
* #OneToMany(
* targetEntity="CustomAttribute",
* mappedBy="EntityId",
* mappedByType={
* "field": "EntityType",
* "value": "product"
* }
* )
*
* #var $CustomAttributes ArrayCollection
*/
protected $CustomAttributes;
}
/**
* #Entity
* #Table(name="custom_attribute")
* #HasLifecycleCallbacks
**/
class CustomAttribute_entity {
/** #Id #Column(type="integer") #GeneratedValue */
protected $Id;
/**
* Many Attributes have One Entity of the EntityType provided.
* #ManyToOne(targetEntity="Product", inversedBy="CustomAttributes")
* #JoinColumn(name="EntityId", referencedColumnName="Id")
*/
protected $EntityId;
/** #Column(type="string") */
protected $EntityType;
/** #Column(type="string") */
protected $Type;
/** #Column(type="string") */
protected $Value;
}