Question

以下是我的观点：

def GeneralUserPictureChange(request, pk, username):
thumb = GeneralUser.objects.get(pk=pk)
if thumb.username == request.user:
    if request.method == 'POST':
        form = GeneralUserPictureChangeForm(request.POST, request.FILES)
        if form.is_valid():
            thumb.thumbnail = form.cleaned_data['thumbnail']
            thumb.save()
            return redirect("user_profile", pk, username)
        else:
            return render_to_response("gnu_picture_change.html", {"form":form, "basic_info":thumb}, context_instance=RequestContext(request))
    else:
        form = GeneralUserPictureChangeForm()
    return render_to_response("gnu_picture_change.html", {"form":form, "basic_info":thumb}, context_instance=RequestContext(request))

当我这样做时，错误没有返回HttpResponse对象。但是当我删除该行 if thumb.username == request.user:继续正确的缩进，它不会给出错误..

需要帮助......

Answer 1

您在这里比较username 字段和user 对象：

if thumb.username == request.user:

thumb.username可能会返回字符串，例如'JohnDoe'
request.user返回类似：<User: johndoe>

所以if似乎是假的 ALLWAYS

要解决此问题，您应该：

if thumb.username == request.user.username:

如果第一个条件是假的，会发生什么？您需要一个替代回报，与if thumb.username...

你得到的是None而不是HttpResponse，因为如果第一个if为假，你就没有回复

def GeneralUserPictureChange(request, pk, username):
thumb = GeneralUser.objects.get(pk=pk)
if thumb.username == request.user:
    if request.method == 'POST':
        form = GeneralUserPictureChangeForm(request.POST, request.FILES)
        if form.is_valid():
            thumb.thumbnail = form.cleaned_data['thumbnail']
            thumb.save()
            return redirect("user_profile", pk, username)
        else:
            return render_to_response("gnu_picture_change.html", {"form":form, "basic_info":thumb}, context_instance=RequestContext(request))
    else:
        form = GeneralUserPictureChangeForm()
    return render_to_response("gnu_picture_change.html", {"form":form, "basic_info":thumb}, context_instance=RequestContext(request))

# You need a return like this one, in case the first if is false
return render_to_response("gnu_picture_change.html", {"Error":'Not valid username'}, context_instance=RequestContext(request))

django视图没有返回一个HttpResponse对象。它返回了None

1 个答案: