如何在Doctrine 2中重新保存实体作为另一行 [英] How to re-save the entity as another row in Doctrine 2

问题描述

假设我有实体 $ e 。有没有任何通用的方式存储它作为另一行，它将具有相同的实体数据，但另一个主键？

为什么我需要这个：我正在实现一些排序时态数据库模式，而不是更新行只需要创建另一个。

解决方案

尝试克隆并将以下方法添加到您的实体中

  public function __clone（）{
 $ this-> id = null; 
} 
  

您可能需要 detach 实体，然后再继续存在。我没有我的开发机器现在可以测试这个。

  $ f = clone $ e; 
 $ em-> detach（$ f）; 
 $ em-> persist（$ f）; 
 $ em-> flush（）; 
  

更新

SQLite演示。你不应该做任何事情。以下工作对我来说没有添加 __ clone（）方法或做任何其他的一般的

  $ new = clone $ old; 
 $ em-> persist（$ new）; 
 $ em-> flush（）; 
  

一旦刷新， $ new 一个新的ID，并被保存为DB中的一个新行。

我仍然会通过 __ clone（）方法，因为它是纯粹的模型视图。

更新2

挖掘Doctrine代码，这是因为生成的代理类使用这个重要行实现 __ clone（）

  unset（$ this-> _entityPersister，$ this-> _identifier）; 
  

Let's say I have entity $e. Is there any generic way to store it as another row, which would have the same entity data but another primary key?

Why I need this: I'm implementing some sort of Temporal Database schema and instead of updating the row I just need to create another one.

解决方案

Try cloning and add the following method to your entity

public function __clone() {
    $this->id = null;
}

You may need to detach the entity before persisting it. I don't have my dev machine handy to test this right now.

$f = clone $e;
$em->detach($f);
$em->persist($f);
$em->flush();

Update

Just tried using a simple SQLite demo. You shouldn't need to do anything. The following worked for me without adding a __clone() method or doing anything else out of the ordinary

$new = clone $old;
$em->persist($new);
$em->flush();

Once flushed, the $new entity had a new ID and was saved as a new row in the DB.

I would still null the ID property via the __clone() method as it makes sense from a pure model view.

Update 2

Digging into the Doctrine code, this is because the generated proxy classes implement __clone() with this important line

unset($this->_entityPersister, $this->_identifier);

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