查询django ManyToMany [英] Querying django ManyToMany
本文介绍了查询django ManyToMany的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有
Foo
< => FooGroup
< => Bar
Foo
<=> FooGroup
<=> Bar
关系,其中< =>
代表ManyToMany字段。
relation, where <=>
stands for ManyToMany field.
如何检索所有 Foo
具体的 Bar
实例?
How do I retrieve all the Foo
s for a specific Bar
instance?
推荐答案
关系非常类似于您的结构:用户< =>组< =>权限
Here's an example with auth models, where the relationship is very much like your structure : User <=> Groups <=> Permission
from django.contrib.auth import models
models.Permission.objects.filter(group__user=models.User.objects.get(username="webmaster"))
您的示例:
Foo.objects.filter(foogroup__bar=barinstance)
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