您如何处理原则 2 中的实体关系？

发布于 2024-11-07 05:44:57 字数 681 浏览 5 评论 0原文

当您想要插入一个实体时，您可以这样做：

$user = new User();
$user->setEmail('[email protected]');

$em->persist($user);
$em->flush();

但是如果我想创建一篇可以有一个用户的文章怎么办？

目前，我需要做：

$user = $em->getRepository('User')->find($id);
$article->setUser($user);

这是因为关系，Doctrine 2 要求一个 User 实体。

但是，我无法“模拟” User 对象，因为我不希望手动设置 id，因此我不能这样做：

$user = new User();
$user->setId(45);

我对这种行为错了吗？你怎么做？

即使使用缓存，加载用户实体只是为了设置关系也可能会影响性能，这并不总是一个选项，尤其是对于更新而言。

原文

When you want to insert an Entity you do this:

$user = new User();
$user->setEmail('[email protected]');

$em->persist($user);
$em->flush();

But what if I want to create an article which can have one User;

Currently, I need to do:

$user = $em->getRepository('User')->find($id);
$article->setUser($user);

This is because of the relationship, Doctrine 2 asks for an User entity.

However, I can't "mock" an User object, because I don't want the id be set manually, therefore I can't do:

$user = new User();
$user->setId(45);

Am I wrong about this behavior, how do you do?

It can be performance matter to load the User entity just to set the relationship, even with a cache, which cannot be always an option, especially for an update.

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幽梦紫曦～ 2024-11-14 05:44:57

如果您没有方便的托管用户实体，那么您想要的是参考代理，EM 很乐意为您提供：

<?php
$article = new Entity\Article();
$article->setTitle('Reference Proxies Rule');
$article->setBody('...');
$article->setUser($em->getReference('Entity\User',45));
$em->persist($article);
$em->flush();

If you don't have a managed User entity handy, what you want is a reference proxy, which the EM will be happy to give you:

<?php
$article = new Entity\Article();
$article->setTitle('Reference Proxies Rule');
$article->setBody('...');
$article->setUser($em->getReference('Entity\User',45));
$em->persist($article);
$em->flush();

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