如何在基於 Django Class 的創建視圖中限制每個用戶每 24 小時只允許發布一次

Question

在views.py中：

class AddPostView(LoginRequiredMixin, CreateView):
    login_url = '/member/login'
    model=Post
    form_class = PostForm
    template_name='post/addpost.html'
    def form_valid(self, form):
        form.instance.poster = self.request.user
        return super(AddPostView, self).form_valid(form)

在 forms.py

class PostForm(forms.ModelForm):
  class Meta:
      model = Post
      fields = ('title','somefields...')
      labels = {'somelabels': '...'}
      widgets = {'some css attributes....'}
      def has_posted_today(self):
          yesterday = timezone.now() - timezone.timedelta(hours=24)
          poster = self.cleaned_data.get('poster')
          if Post.objects.filter(poster=poster, post_date__gt=yesterday).exists():
              raise forms.ValidationError("You have already posted today, Come back tomorrow!")

在模型.py

class Post(models.Model):
    title = models.CharField(max_length=100)
    poster = models.ForeignKey(User, on_delete=models.CASCADE)
    post_date = models.DateTimeField(default=timezone.now, blank=True)
    ...somefields = ...somemodels

如果這是基於 function 的視圖，我想解決方案將類似於...

if request.method == "POST":
    yesterday = timezone.now() - timezone.timedelta(days=1)
    if Post.objects.filter(poster=request.user, post_date__gt=yesterday).exists():
        return HttpResponseForbidden("You have already posted today, Come back tomorrow!")

第一個問題，我的代碼不起作用....我如何使它工作....

第二個問題，您如何在基於 django class 的視圖中執行 HttpResponseForbidden 操作。

Answer 1

在views.py中：

class AddPostView(UserPassesTestMixin, LoginRequiredMixin, CreateView):
    login_url = '/member/login'
    model=Post
    form_class = PostForm
    template_name='post/addpost.html'
    def test_func(self):
        yesterday = datetime.now() - timedelta(day=1)
        #print to see which time is correct.
        print('this is yesterday...', yesterday)
        print('this is timezone.now()...', timezone.now())
        print('this is daytime.now()...', datetime.now())
        if Post.objects.filter(poster=self.request.user, post_date__gt=yesterday).exists():
            raise PermissionDenied("You have made your post today, Please come back later")
            return False
        else:
            return True
    def form_valid(self, form):
        form.instance.poster = self.request.user
        return super(AddPostView, self).form_valid(form)

在 403.html 中：

{%extends 'base.html'%}
{%block content%}
    {%if exception%}
        <h1>{{exception}}</h1>
    {%else%}
        <h1>Somethings Wrong!</h1>
    {%endif%}
{%endblock%}