In the default Django admin view for user-object (edit user) one can edit the user's group memberships. What if I wanted this the other way around also? I.e. in the group editing page one could select the users that belong to the group being edited.
As I see this, Django doesn't have a ManyToMany mapping from Group to User object which makes it impossible(?) to implement a ModelAdmin class for this particular case. If I could make an additional UsersOfGroup model class and use it in the Django's Group model's ManyToMany field as a through-attribute, there could be a way.
Any ideas, is this possible to implement using ModelAdmin tricks or do I just have to make a custom view for editing groups?
I have checked these two other questions, but they don't quite do the same thing:
Assigning a group while adding user in admin
and
Show group membership in admin
Updated: The answer from Chris was almost there. :) The group has a reference to the users set, but it's called user_set, not users. So these are the changes I made:
if self.instance and self.instance.pk:
self.fields['users'].initial = self.instance.user_set.all()
and
if group.pk:
group.user_set = self.cleaned_data['users']