ValueError: Поле 'id' ожидало число, но получило '<built-in function id>'; Перенаправление POST-запроса

Когда пользователь успешно выполняет POST запрос на редактирование собственного вопроса, он перенаправляется на страницу подробностей того же вопроса. При последующем запросе GET к представлению PostedQuestionPage после редактирования вопроса возникает следующая ошибка ValueError при попытке получить экземпляр с get_object_or_404():

• ValueError: Field 'id' expected a number but got '<built-in function id>'

Почему передается PostedQuestionPage, а не значение, которое должно представлять идентификатор экземпляра вопроса? '<built-in function id>'

> c:\..\posts\views.py(137)get()
-> question = get_object_or_404(Question, id=question_id)
(Pdb) ll
134         def get(self, request, question_id):
135             import pdb; pdb.set_trace()
136             context = self.get_context_data()
137  ->         question = get_object_or_404(Question, id=question_id)
138             context['question'] = question
139             return self.render_to_response(context)
(Pdb) question_id
'<built-in function id>'
(Pdb) n
ValueError: Field 'id' expected a number but got '<built-in function id>'.
> c:\..\posts\views.py(137)get()
-> question = get_object_or_404(Question, id=question_id)
(Pdb) n
--Return--
> c:\..\posts\views.py(137)get()->None
-> question = get_object_or_404(Question, id=question_id)

class TestPostEditQuestionPage(TestCase):
    '''Verify that a message is displayed to the user in the event
    that some aspect of the previous posted question was edited.'''

    @classmethod
    def setUpTestData(cls):
        cls.user = get_user_model().objects.create_user(
            username="OneAndOnly",
            password="passcoderule"
        )
        profile = Profile.objects.create(user=cls.user)
        tag = Tag.objects.create(name="TagZ")
        question = Question.objects.create(
            title="This is Question Infinity",
            body="The is the content body for This is Question Infinity",
            profile=profile
        )
        question.tags.add(tag)

        cls.data = {
            "title": "This is Question Zero",
            "body": "The is the content body for This is Question Infinity",
            "tags_0": "TagN", "tags_1": "TagZ"
        }

    def test_posted_question_content_changed(self):
        self.client.force_login(self.user)
        response = self.client.post(
            reverse("posts:edit", kwargs={"question_id": 1}),
            data=self.data
        )
        self.assertRedirects(
            response, reverse("posts:question", kwargs={"question_id": 1}), 
            status_code=303
        )

class Page(TemplateView):

    def get_context_data(self, **kwargs):
        context = super().get_context_data()
        context['search_form'] = SearchForm()
        return context

class PostedQuestionPage(Page):

    template_name = "posts/question.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['answer_form'] = AnswerForm
        return context

    def get(self, request, question_id):
        context = self.get_context_data()
        question = get_object_or_404(Question, id=question_id)
        context['question'] = question
        return self.render_to_response(context)


    def post(self, request, question_id):
        question = get_object_or_404(Question, id=question_id)
        context = super.get_context_data()
        form = context['answer_form'](request.POST)
        if form.is_valid():
            form.cleaned_data.update({"profile": request.user.profile})
            answer = Answer.objects.create(
                **form.cleaned_data, question=question
            )
            return SeeOtherHTTPRedirect(
                reverse("posts:question", kwargs={
                    "question_id": answer.question.id
                })
            )

class EditQuestionPage(AskQuestionPage):
    ...

    def post(self, request, question_id):
        ...
        return SeeOtherHTTPRedirect(reverse(
            "posts:question", kwargs={"question_id": id}
        ))