在Symfony2中创建具有可扩展实体的便携式捆绑包

问题描述：

我想创建一些可重复使用不同项目的Symfony2软件包，但是如果需要，那些实体也可以轻松扩展。

I want to create some Symfony2 bundles which are reusable accross different projects, but where the entities also can be easily extended if required.

一个例子可以是可重用的UserBundle包含一个定义了所有ORM映射的用户实体。然而，在我的应用程序中，我可能想扩展这个实体，并添加额外的列，关联或覆盖一些父对象的映射。

An example could be a reusable UserBundle, which contains a User entity with all the ORM mappings defined. In my application however, I might want to extend this entity and add extra columns, associations or override some of the parent's mappings.

最接近的解决方案是Doctrine2的映射超类，但是我会失去我的可重用捆绑包的即插即用性，我总是必须在我的应用程序中扩展映射的超类，即使我不想修改映射。

The closest solution I could find are Doctrine2's mapped superclasses, but then I'd lose the plug-and-playness of my reusable bundle, I'd always have to extend the mapped superclass in my application even if I don't wish to modify the mappings.

其他记录的继承方案需要修改父级的映射，然后我的UserBundle将不再可移植到项目中。

The other documented inheritance schemes require modifying the parent's mappings, and then my UserBundle wouldn't be portable anymore accross projects.

是否有一种将一个完整工作的实体定义在一个bundle中的方式，并且仍然扩展到另一个bundle中。

Is there a way to define a fully-working entity in one bundle, and still extend that in another bundle?

答

这可以使用目标实体解决方案解决。

您可以在 Symfony文档。

这些步骤非常直观： / p>

The steps are pretty straighforward:

在用户实体

namespace Acme/UserBundle/Model;
interface UserInterface
{
    // public functions expected for entity User
}

使您的基数用户实体实现界面

namespace Acme/UserBundle/Entity;
/**
 * @ORM\Entity
 */
class User implements UserInterface
{
    // implement public functions
}

像往常一样创建关系，但使用界面

Create relationships as usual, but using the interface

namespace Acme/InvoiceBundle/Entity;
/**
 * @ORM\Entity
 */
class Invoice
{
    /**
     * @ORM\ManyToOne(targetEntity="Acme\UserBundle\Model\UserInterface")
     */
    protected $user;
}

通过将以下内容添加到config.yml

Configure the listener by adding the following to config.yml

doctrine:
    # ....
    orm:
        # ....
        resolve_target_entities:
            Acme\UserBundle\Model\UserInterface: Acme\UserBundle\Entity\User

如果您要为您当前的应用程序定制用户实体

If you want to customize User entity for your current application

从用户中扩展类或实现 UserInterface

namespace Acme/WebBundle/Entity;
use Acme/UserBundle/Entity/User as BaseUser;
/**
 * @ORM\Entity
 */
class User extends BaseUser
{
    // Add new fields and functions
}

相应地配置听众

Configure the listener accordingly

doctrine:
    # ....
    orm:
        # ....
        resolve_target_entities:
            Acme\UserBundle\Model\UserInterface: Acme\WebBundle\Entity\User

在Symfony2中创建具有可扩展实体的便携式捆绑包

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