TPT3 - Adding custom resource method

api.py

class TodoListResource(ModelResource):

    def prepend_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/stats%s$" %
                (self._meta.resource_name, trailing_slash()),
                self.wrap_view('stats'), name="api_list_stats"),
        ]

    def dehydrate(self, bundle):
        items = bundle.obj.items.all()
        bundle.data['item_count'] = items.count()
        bundle.data['items'] = [i.to_dict() for i in items]

        return bundle

    def stats(self, request, **kwargs):
        stats = {}
        stats['list_count'] = request.user.todo_lists.all().count()
        stats['item_count'] = TodoItem.objects.filter(
            todo_list_id__in=[l.id for l in request.user.todo_lists.all()]).count()
        return self.create_response(request, stats)

    class Meta:
        authentication = SessionAuthentication()
        authorization = AuthorizationByUser()
        queryset = TodoList.objects.all()
        resource_name = 'list'