Querying django ManyToMany

Question

I have got

Foo <=> FooGroup <=> Bar

relation, where <=> stands for ManyToMany field.

How do I retrieve all the Foos for a specific Bar instance?

Answer 1

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"))

With your example:

Foo.objects.filter(foogroup__bar=barinstance)