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TenantUserProjectMember两者VendorUserProjectMember都有一个$user属性，但它们有不同的 targetEntities。这两个类都扩展了 MappedSuperclass AbstractUserProjectMember。虽然未显示，但此$user属性具有其他属性，我想在其中定义一次AbstractUserProjectMember并覆盖具体类中的关联。

我尝试了以下方法，但得到了错误关联TenantUserProjectMember#user并VendorUserProjectMember#user引用了AbstractUser#projectMembers不存在的反向字段。请注意，我不能添加 a $projectMembers，AbstractUser因为并非所有扩展类都具有这样的属性。

是否可以在扩展的具体类中指定父级的 targetEntity，如果可以，如何指定？

#[ORM\MappedSuperclass]
abstract class AbstractUserProjectMember implements UserCreateActionInterface
{
    #[ORM\ManyToOne(targetEntity: AbstractUser::class)] //Override join table and add inversedBy in child class
    // More attributes but just not shown in this example
    protected TenantUser|VendorUser|null $user = null;

    // Typical properties, getters, and setters...
}

#[ORM\Entity]
#[ORM\AssociationOverrides([
    new ORM\AssociationOverride(
        name: "user",
        joinTable: new ORM\JoinTable(name: "tenant_user"),
        inversedBy: "projectMembers",
    ),
])]
class TenantUserProjectMember extends AbstractUserProjectMember
{
    // Typical properties, getters, and setters...
}

#[ORM\Entity]
#[ORM\AssociationOverrides([
    new ORM\AssociationOverride(
        name: "user",
        joinTable: new ORM\JoinTable(name: "vendor_user"),
        inversedBy: "projectMembers",
    ),
])]
class VendorUserProjectMember extends AbstractUserProjectMember
{
    // Typical properties, getters, and setters...
}

#[ORM\Entity]
class TenantUser extends AbstractUser
{
    #[ORM\OneToMany(mappedBy: 'user', targetEntity: TenantUserProjectMember::class)]
    private ?Collection $projectMembers = null;

    // Typical properties, getters, and setters...
}

#[ORM\Entity]
class VendorUser extends AbstractUser
{
    #[ORM\OneToMany(mappedBy: 'user', targetEntity: VendorUserProjectMember::class)]
    private ?Collection $projectMembers = null;

    // Typical properties, getters, and setters...
}

#[ORM\Entity]
#[ORM\InheritanceType(value: 'JOINED')]
#[ORM\DiscriminatorColumn(name: 'type', type: 'string')]
#[ORM\DiscriminatorMap(value: ['tenant' => TenantUser::class, 'system' => SystemUser::class, 'vendor' => VendorUser::class])]
#[ORM\Table(name: '`user`')]
abstract class AbstractUser
{
    // Note that only child class TenantUser and VendorUser have a $projectMembers property and SystemUser does not.

    // Typical properties, getters, and setters...
}
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