django unboundlocalerror 表单集

Question

我有一个表单集，允许用户向为其项目捐赠的用户提供多种奖励。

如果我登陆页面并且未输入任何信息，请提交，我会收到一个 UnboundLocalError ，这看起来很奇怪，因为我正在检查表单以及表单集是否有效。

Exception Type: UnboundLocalError at /projects/new/
Exception Value: local variable 'reward' referenced before assignment

视图.py

def new(request, template_name='projects/new.html'):

if request.POST:

    form = UserSubmittedProjectForm(request.POST, request.FILES)
    if form.is_valid():
        project = form.save(commit=False)
        reward_formset = RewardFormSet(request.POST, instance=project)
        if reward_formset.is_valid():
            slug = request.POST.get("project_name")
            project.slug = slugify(slug)
            project.status = 'PR'
            project.owner = request.user
            project.money_raised = 0
            project.date_published = datetime.now()
            project.save()
            form.save_m2m()
            reward_formset.save()
            signals.post_save.connect(notify_admins, sender=Project)
            return HttpResponseRedirect('/projects/')
else:
    form = UserSubmittedProjectForm()
    reward = RewardFormSet(instance=Project())

context = { 'form':form,'reward':reward, }

return render_to_response(template_name, context,
    context_instance=RequestContext(request))

Answer 1

您已将表单集称为不同的东西 - POST 块中的 reward_formset，但在非 POST 块中仅称为 reward。如果它是 POST 并且无效，它将落到底部，其中代码需要一个尚未定义的变量 reward。

变量命名保持一致。

Answer 2

“奖励”仅在 else 块中可见，移动变量以实现正确的范围，例如：

def new(request, template_name='projects/new.html'):

    form = UserSubmittedProjectForm()
    reward = RewardFormSet(instance=Project())

    if request.POST:
       form = UserSubmittedProjectForm(request.POST, request.FILES)
       ...    

    context = { 'form':form,'reward':reward, }

    return render_to_response(template_name, context,
        context_instance=RequestContext(request))