django class based views sample code.

django_views.py

# -------- models --------------
class CheckStart(models.Model):
    check_start = models.OneToOneField(Checklist, related_name="start")
    Registration = models.BooleanField(default=False)
    Make_an_offer = models.BooleanField(default=False)
    Offer_accepted = models.BooleanField(default=False)


class CheckStartForm(ModelForm):
    class Meta:
        model = CheckStart
        exclude = ('check_start',)
# -------- END models --------------        


# ---------- Handy :-) : ---------- 
# from django.forms.models import model_to_dict
# model_to_dict(cc)


class Page1Update(UpdateView):
    model = Checklist
    form_class = ChecklistForm
    success_url = "/house/checklist_list/"

    def get(self, request, *args, **kwargs):
        cl = Checklist.objects.get(pk=kwargs['pk'])
        # import pdb
        # pdb.set_trace()
        try:
            cs = CheckStart.objects.get(check_start=cl)
        except Exception:
            cs = CheckStart.objects.create(check_start=cl)
            cs.save()

        csf = CheckStartForm(instance=cs, initial={'check_start': cl})
        return render_to_response('house/start.html', {'form': csf}, RequestContext(request))

    def post(self, request, *args, **kwargs):
        cs = CheckStart.objects.get(check_start=Checklist.objects.get(pk=kwargs['pk']))

        cs.Offer_accepted = ('Offer_accepted' in request.POST and request.POST['Offer_accepted'] == 'on')
        cs.Make_an_offer = ('Make_an_offer' in request.POST and request.POST['Make_an_offer'] == 'on')
        cs.Registration = ('Registration' in request.POST and request.POST['Registration'] == 'on')

        cs.save()
        return HttpResponseRedirect('/house/checklist_list/')