Django form dispatch method : value error : view returned None instead of HttpResponse

Question

我想做什么:

我正在检查用户是否来自 "support" 组，然后他才能查看页面。如果不是，我想在响应页面中向用户显示正确的消息。我在 dispatch() 视图方法上应用了 group_required 装饰器，用于检查用户是否来自支持组。

我试过了 :

但仍然收到 ValueError。

我的代码

view.py

class ScheduledTestView(FormView):
    '''
    Provides an admin panel interface for creating scheduled tests.
    Scheduled test will be created as active=False intially.
    '''
    serializer_class = TestShortSerializer
    template_name = 'admin/scheduled_test.html'
    form_class = ScheduledTestForm

    @method_decorator(group_required(['support']))
    def dispatch(self, request, *args, **kwargs):
        return super(ScheduledTestView, self).dispatch(request, *args, **kwargs)

group_required函数

def group_required(group_names):
    """
     group_name will be the list of group name
    """
    def decorator(func):
        @wraps(func, assigned=available_attrs(func))
        def inner(request, *args, **kwargs):
            user = request.user
            if user.is_authenticated():
                if (user.groups.filter(name__in=group_names) and user.is_staff) or user.is_superuser:
                    return func(request, *args, **kwargs)
                return redirect_to_login('/admin/')
        return inner
    return decorator

错误

GET Request URL: http://localhost:8000/admin/support/scheduled_test/

Django Version: 1.8.4

Exception Type: ValueError

Exception Value:
The view support.views.ScheduledTestView didn't return an HttpResponse object. It returned None instead.

Exception Location: /home/kishan/.virtualenvs/kishan_pal/local/lib/python3.4/site-packages/django/core/handlers/base.py in get_response, line 151

Answer 1

正如@Daniel Roseman 在您的问题下方的评论中提到的那样。如果用户未通过身份验证，则 inner 不会 return 任何响应，而在这种情况下它应该 return redirect_to_login('/admin/')。

如此变化

def inner(request, *args, **kwargs):
    user = request.user
    if user.is_authenticated():
        if (user.groups.filter(name__in=group_names) and user.is_staff) or user.is_superuser:
            return func(request, *args, **kwargs)
        return redirect_to_login('/admin/')

到

def inner(request, *args, **kwargs):
    user = request.user
    if user.is_authenticated():
        if (user.groups.filter(name__in=group_names) and user.is_staff) or user.is_superuser:
            return func(request, *args, **kwargs)
    return redirect_to_login('/admin/')

应该可以解决问题。查看差异 return redirect_to_login('/admin/') 在 if 块之外。

Django form dispatch method : value error : view returned None instead of HttpResponse

Django form dispatch method : value error : view returned None instead of HttpResponse

python

django

django-forms

django-admin

django-views