Symfony2 - 扩展实体，抽象实体 [英] Symfony2 - extending entities, abstract entity

问题描述

我有 2 个具有相同字段的实体 - 父级、子级、订单.实际上它是一种机制，这三个字段不适用于该实体的内容 - 如名称、标题、类别等.

I have 2 entities with the same fields - parent, children, order. Actually it is a mechanism and this 3 fields not applicable to content of this entity - like name, title, category etc.

我想将此字段设置为一个位置、一个类，我正在考虑将其放在哪里.它应该是一个抽象类吗?还是我应该制作一个特质?

I want to set this fields to one place, one class and I'm considering where should I put it. Should it be an abstract class? Or should I make a trait?

我也可以使用ORM\Discriminator机制，但我认为这是为了别的东西，而不是我想要做的.

I also can use ORM\Discriminator mechanism, but I think this is for something else, not for that what I want to do.

推荐答案

我会用 @MappedSuperClass 注释和共享字段以及实体扩展它们的学说创建一个抽象类

i would make an abstract class with doctrines @MappedSuperClass annotation and shared fields and the entities extend them

这是一个共享 created_at 字段的示例

here is an example with a shared created_at field

namespace Your\CoreBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Mapping\MappedSuperclass;



/**
 * Abstract base class to be extended by my entity classes with same fields
 *
 * @MappedSuperclass
 */
abstract class AbstractEntity {

    /**
     * @var integer
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(name="created_at", type="datetime")
     */
    private $createdAt;


    /**
     * Get id
     * @return integer
     */
    public function getId() {
        return $this->id;
    }

    /**
     * Get createdAt
     * @return \DateTime
     */
    public function getCreatedAt() {
        return $this->createdAt;
    }

    /**
     * Set createdAt
     *
     * @param \DateTime $createdAt
     *
     * @return AbstractEntity
     */
    public function setCreatedAt($createdAt)
    {
        $this->createdAt = $createdAt;

        return $this;
    }

} 

您的实体都扩展了此类，例如:

your entities both extend this class like:

class YourEntityClass extends AbstractEntity
{

在 YourEntityClass 中，$id 属性必须受到保护"

in YourEntityClass the $id property must be "protected"

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