当插入具有关联的实体时，有没有办法只使用FK而不是检索实体？ [英] When inserting an entity with associations, is there a way to just use the FK instead of retrieving the entity?

问题描述

我需要插入一个具有关联的实体。

I need to insert an entity which has associations.

如果我已经拥有关联实体的FK，有没有办法将主实体插入到db只有FK的填充？

If I already have the FK's of the associated entities, is there a way to insert the primary entity into the db with just the FK's populated?

或者我一直都要

• 通过FK检索关联的实体，


• 填充主体实体的属性，参考协议，


• ，然后调用persist方法。 >
  

• retrieve the associated entities via the FK's,
• populate the primary entity's properties referring to the assocations,
• and then invoke the persist method.

推荐答案

你想要一个参考代理

说我有帖子和标签。一个帖子有很多标签。我从用户那里得到一堆标签，他们检查了一堆复选框。

Let's say I have Posts and Tags. A Post hasMany Tags. I get a bunch of tags from the user, who checked a bunch of checkboxes.

以下内容将添加标签到现有的帖子，而不是首先获取每个标签实体。它通过使用由 EntityManager :: getReference（）生成的引用代理来实现：

The following would add tags to an existing post, without fetching each tag entity first. It does this by using reference proxies, generated by EntityManager::getReference():

$tag_ids = $_POST['tag_id']; // an array of integers representing tag IDs.
$post = $em->getRepository('Post')->find($post_id); // returns a Post entity.

foreach($tags_ids as $tid){
   $post->addTag($em->getReference('Tag',$tid));
}
$em->persist($post);
$em->flush();

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