CBV for multi-form round trip

multiform_cbv.py

class WorkEditView(DetailDisplayView, ModelFormMixin):
    """Shows the edit page for a work."""

    get_object = user_check("user_can_edit")(DetailDisplayView.get_object)

    queryset = Work.objects.all()
    template_resource_name = "work"
    template_name = 'artists/work_edit.html'
    
    def get(self, request, *args, **kwargs):
        set_response_class("edit")
        self.object = self.get_object()
        return self.render_to_response(
            self.get_context_data()
        )
        
    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        forms = self.get_forms()
        if not self.object.user_can_edit(self.request.user):
            raise HttpForbidden()
        if min(
            map(
                lambda x: x.is_valid(), forms.values()
            )
        ):
            # VALID!
            work = forms['edit'].save()
            del forms['edit']
            # don't care about the other results
            map(lambda x: x.save(), forms.values())
            return HttpResponseRedirect(work.url.edit)
        else:
            # INVALID!
            return self.render_to_response(self.get_context_data())

    def get_context_data(self):
        return {
            'work': self.object,
            'forms': self.get_forms(),
        }

    def get_forms(self):
        MetadataEditFormSet = get_metadata_formset(self.object)
        return {
            'edit': WorkEditForm(prefix='edit', **self.get_form_kwargs()),
            'metadata': MetadataEditFormSet(
                prefix='metadata',
                **FormMixin.get_form_kwargs(self)
            ),
            'workartists': get_workartist_formset(self.object)(
                prefix='workartists',
                **FormMixin.get_form_kwargs(self)
            ),
            'connections': get_connection_forward_formset(self.object)(
                prefix='connections',
                **FormMixin.get_form_kwargs(self)
            ),
        }