问题描述
我有 [个人资料] --M2M - > [group] --FK - > [group category] 。
I have [profile] --M2M--> [group] --FK--> [group category].
给定一个 [group category] ，我需要检索所有相关的 [profile] 。
Given an instance of [group category], I need to retrieve all related [profile].
（在英文中：我有成员属性对于一个或多个分组，我需要查找给定类别的组中的所有成员）。
(In english: I have members belonging to one or more groups, which are in categories. I need to find all the members in a given category of group).
如何跨越ForeignKey和ManytoMany键在中间？无论我如何划分这个，我总是得到一个表达，我从中不能定义下一个向后关系。
How do I span the ForeignKey and ManytoMany keys in between? No matter how I slice this, I always end up with an expression from which I can't define the next backward relationship.
谢谢。
推荐答案
假设如下：
object Profile():
groups = models.ManyToManyField('Group')
object Group():
category = models.ForeignKey('GroupCategory')
您应该能够查询：
profiles = Profile.objects.filter(groups__category=thegroupcategory)
这篇关于Django中的链式反向查找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！