在 Django 中引发 Http404

Question

我有以下路径：

path("polls/<int:week_id>/vote/", views.vote, name="vote")

在我看来，我写了以下方法：

def vote(request, week_id):
  week = Week.objects.get(pk=week_id)
  try:
    selected_choice = week.choice_set.get(pk=request.POST["choice"])
  except Week.DoesNotExist:
    raise Http404("Poll for said week does not exists")
  else:
    selected_choice.votes += 1
    selected_choice.save()
    return redirect("results", week_id)

如果用户导航到polls/123/vote，我正在尝试引发404 页面，其中123 是数据库中不存在的一周。由于某种原因，上面的代码返回了一个DoesNotExist 错误，而不是实际的404 页面。我假设那行代码是我提出的404 页面没有被击中。对吗？

Answer 1

您需要将week 向下移动到 try 块中：

def vote(request, week_id):
  try:
    week = Week.objects.get(pk=week_id)
    selected_choice = week.choice_set.get(pk=request.POST["choice"])
  except Week.DoesNotExist:
    raise Http404("Poll for said week does not exists")
  else:
    selected_choice.votes += 1
    selected_choice.save()
    return redirect("results", week_id)