Class-based views for M2M relationship with intermediate model

Question

I have a M2M relationship between two Models which uses an intermediate model. For the sake of discussion, let\'s use the example from the manual:

class Pers         


        

Answer 1

You must extend CreateView:

from django.views.generic import CreateView

class GroupCreate(CreateView):
    model=Group

and override the form_valid():

from django.views.generic.edit import ModelFormMixin
from django.views.generic import CreateView

class GroupCreate(CreateView):
    model = Group

    def form_valid(self, form):
        self.object = form.save(commit=False)
        for person in form.cleaned_data['members']:
            membership = Membership()
            membership.group = self.object
            membership.person = person
            membership.save()
        return super(ModelFormMixin, self).form_valid(form)

As the documentation says, you must create new memberships for each relation between group and person.

I saw the form_valid override here: Using class-based UpdateView on a m-t-m with an intermediary model