我有这样的实体：
请求. php（父项）

/**
 * @ORM\Entity(repositoryClass=RequestRepository::class)
 * @ORM\InheritanceType("JOINED")
 * @ORM\DiscriminatorColumn(name="type", type="string")
 * @ORM\DiscriminatorMap({
 *      "requestA" = "RequestA",
 *      "requestB" = "RequestB"
 * })
 */
abstract class Request
{
    /*...*/
}

请求A.php（子项A）

/**
 * @ORM\Entity(repositoryClass=DemenagementRepository::class)
 */
class RequestA extends Request implements AddressEntityInterface
{
    /**
     * @ORM\OneToOne(targetEntity=Address::class, inversedBy="request")
     * @ORM\JoinColumn(nullable=false)
     */
    private $address;

    // +others...
}

请求B.php（子级B）

/**
 * @ORM\Entity(repositoryClass=DemenagementRepository::class)
 */
class RequestB extends Request implements AddressEntityInterface
{
    /**
     * @ORM\OneToOne(targetEntity=Address::class, inversedBy="request")
     * @ORM\JoinColumn(nullable=false)
     */
    private $address;

    // +others...
}

AddressEntityInterface.php

interface AddressEntityInterface
{
    public function getAddress(): ?Address;
    public function setAddress(Address $address): self;
}

Address.php

/**
 * @ORM\Entity(repositoryClass=AddressRepository::class)
 */
class Address
{
    /**
     * @ORM\OneToOne(targetEntity=??????, mappedBy="address")
     */
    private $request;

    public function getRequest() { /* ... */ }
}

我想使用getRequest（）还原关系，如何动态创建targetEntity？
谢谢