I'm using MongoDB with Spring Data. I'd like to have one document reference another (a user in fact), but I end up with having to do extra work. E.g.
我正在使用MongoDB和Spring Data。我希望有一个文档引用另一个(事实上是用户),但最终我不得不做额外的工作。例如。
class Watch {
String id;
User user;
}
That's nice, but I seem to end up with the whole user embedded in the document, so I do this:
这很好,但我似乎最终将整个用户嵌入到文档中,所以我这样做:
class Watch {
String id;
String userId;
}
But then I want to use it in some JSTL, and I want to do this:
但后来我想在一些JSTL中使用它,我想这样做:
${watch.user.email}
But I have to add some mapping code.
但我必须添加一些映射代码。
1 个解决方案
#1
5
Use @DBRef annotation on user.
在用户上使用@DBRef注释。
You need to save user separately (no cascading), but you probably want to do that.
您需要单独保存用户(无级联),但您可能希望这样做。
Beware that user will be loaded eagerly.
请注意,用户将被急切地加载。
#1
5
Use @DBRef annotation on user.
在用户上使用@DBRef注释。
You need to save user separately (no cascading), but you probably want to do that.
您需要单独保存用户(无级联),但您可能希望这样做。
Beware that user will be loaded eagerly.
请注意,用户将被急切地加载。