Python 在类基视图中的何处放置逻辑？

我想了解在类基视图中，我将在何处执行以下逻辑：

基本上，我想检查用户是否有帐户，如果是这样的话，将它们转发到URL A，或者URL B。但是，我不能100%确定get_success_URL（）是否是CBV中的最佳位置，或者Django是否有适合此用例的东西。我见过其他CBV，但我尝试过，但失去了范围。请记住，我需要传递用户id

到目前为止，我已经做到了这一点：

class CampaignView(BaseUpdateView):
    form_class = UserLookUpFrom
    model = Campaign


    def get_context_data(self, **kwargs):
        context = super(CampaignView, self).get_context_data(**kwargs)
        # context['form'] = AppUserLookUpFrom

        return context


    def form_valid(self, form):
        """
        If the form is valid, in this case DON'T save it!
        """
        return super(CampaignView, self).form_valid(form)


    def get_success_url(self):

        """
        Returns the supplied URL.
        """
        if self.success_url:
            url = self.success_url % self.object.__dict__
        else:
            try:
                currect_user = Campaign.object.get_user_by_email(EMAIL HERE DONT KNOW HOW TO GET THIS YET FROM FORM)
                if currect_user:
                         url = reverse('campaigns_login', args=(self.object.id,'self.userid'))
                else:
                         url = reverse('campaigns_register', args=(self.object.id)



            except AttributeError:
                raise ImproperlyConfigured(
                    "No URL to redirect to.  Either provide a url or define"
                    " a get_absolute_url method on the Model.")
        return url

---

您可以在

表单中执行此操作。下面是一段未经测试的代码，可以帮助解释这一概念：

from django.shortcuts import redirect

def form_valid(self, form):
    email = form.cleaned_data.get("email", "")
    prev_user = Campaign.object.filter(email=email)
    if prev_user:
       return redirect('campaigns_login', self.object.id, prev_user[0].userid)
    else:
       return redirect('campaigns_register', self.object.id)

我认为应该放在竞选观点的帖子上：

def post(self, request, *args, **kwargs):
   form= self.form_class(request.POST)
   if form.is_valid():
      user_email= form.cleaned_data['email']
      user_of_campaign= Campaign.objects.filter(email= user_email)
      if len(user_of_campaign)>0:
         return redirect('/login', user_of_campaign[0].id)
      else: 
         return redirect('/register')
      return super(CampaignView, self).form_valid(form)
   return super(CampaignView, self).form_invalid(form)

嗨，谢谢你。你能解释一下最后两次的回程吗？我不知道第二个如何工作。第二个是，如果表单无效，那么用户将返回到初始表单页面。