问题描述
我正在尝试扩展django.contrib.auth并遇到将用户添加到组的问题，这可以通过2种方法来完成。我只是想知道为什么会这样，而一个相对于另一个有什么优势呢？
I am trying to extend django.contrib.auth and came accross adding a user into a group, which can be done in 2 ways. I was just wondering why is it like so, and what are the advantages of one over the other.
推荐答案
多对多关系由中间表和两个模型的外键组成。 user.groups.add（group）将在该表中创建一个条目，其中外键指向 user 并 group 实例。 group.user_set.add（user）也是如此。
A many-to-many relation consists of an intermediate table with a foreign key to both models. user.groups.add(group) will create an entry in that table where the foreign keys point to the user and group instances. The same happens with group.user_set.add(user).
这篇关于user.groups.add（group）或group.user_set.add（user），哪个更好，为什么？或他们之间的差异的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！