教义2的多重映射

Question

我在正确设置教义映射时遇到问题。

我有一个CashRegister实体，该实体具有容器位置和返回容器位置。两个位置都来自相同的类型（BinLocation实体）。

从发出CashRegister，CashRegister->getBinLocations()并且CashRegister->getReturnBinLocations()工作正常，但是如何实现BinLocation->getCashRegisters()返回所有CashRegister引用的实体（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

简单的答案是你不能。mappedBy只接受一个参数。

然而实现您想要的目标的解决方案很简单。BinLocation在Called:中创建第二个属性，cashRegisters2如下所示：

/**
 * @var CashRegister[]
 *
 * @ORM\OneToMany(targetEntity="CashRegister", mappedBy="binLocation")
 */
private $cashRegisters;

/**
 * @var CashRegister[]
 *
 * @ORM\OneToMany(targetEntity="CashRegister", mappedBy="binLocation") 
 */
private $cashRegisters2;

然后将集合合并到您的getCashRegisters方法中。

/**
 * @return CashRegister[]
 */
public function getCashRegisters()
{
    return new ArrayCollection(
                      array_merge($cashRegisters->toArray(), $cashRegisters2->toArray())
    );
}

还要相应地更改您的CashRegister映射：

/**
 * @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;

注意：我没有测试代码。此示例仅供服务器指南。

注2： ArrayCollection合并的灵感来自于这里：/sf/answers/1181007761/