php 如何将实体重新保存为 Doctrine 2 中的另一行
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How to re-save the entity as another row in Doctrine 2
提问by zerkms
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?
假设我有 entity $e。是否有任何通用方法将其存储为另一行，该行将具有相同的实体数据但另一个主键？
Why I need this: I'm implementing some sort of Temporal Databaseschema and instead of updating the row I just need to create another one.
为什么我需要这个：我正在实施某种临时数据库模式，而不是更新行，我只需要创建另一个。
回答by Phil
Try cloning and add the following method to your entity
尝试克隆并将以下方法添加到您的实体
public function __clone() {
$this->id = null;
}
You may need to detachthe entity before persisting it. I don't have my dev machine handy to test this right now.
您可能需要在持久化实体之前分离实体。我现在手边没有我的开发机器来测试这个。
$f = clone $e;
$em->detach($f);
$em->persist($f);
$em->flush();
Update
更新
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
刚刚尝试使用一个简单的 SQLite 演示。你不应该需要做任何事情。以下内容对我有用，无需添加__clone()方法或做任何其他不寻常的事情
$new = clone $old;
$em->persist($new);
$em->flush();
Once flushed, the $newentity had a new ID and was saved as a new row in the DB.
一旦刷新，$new实体就有了一个新 ID 并在数据库中保存为新行。
I would still null the ID property via the __clone()method as it makes sense from a pure model view.
我仍然会通过该__clone()方法将 ID 属性设为空，因为从纯模型视图来看它是有意义的。
Update 2
更新 2
Digging into the Doctrine code, this is because the generated proxy classes implement __clone()with this important line
深入研究 Doctrine 代码，这是因为生成的代理类实现__clone()了这一重要行
unset($this->_entityPersister, $this->_identifier);
回答by redolent
Here's a simple strategy I used that doesn't involve excessive complexity:
这是我使用的一个简单的策略，它不涉及过多的复杂性：
$new->fromArray( $old->toArray() );
$new->id = NULL;
