无法覆盖Django中的注销

Question

我正在尝试覆盖DJango注销，执行以下操作：

registration_urls.py

urlpatterns = patterns(
    '',
    url(r'^activate/complete/$',
        TemplateView.as_view(
            template_name='registration/activation_complete.html'),
        name='registration_activation_complete'),
    # Activation keys get matched by \w+ instead of the more specific
    # [a-fA-F0-9]{40} because a bad activation key should still get to the view
    # that way it can return a sensible "invalid key" message instead of a
    # confusing 404.
    url(r'^activate/(?P<activation_key>\w+)/$',
        ActivationView.as_view(),
        name='registration_activate'),
    url(r'^register/$',
        FHRegistrationView.as_view(form_class=RegistrationFormUserProfile),
        name='registration_register'),
    url(r'^register/complete/$',
        TemplateView.as_view(
            template_name='registration/registration_complete.html'),
        name='registration_complete'),
    (r'', include('registration.auth_urls')),

    #url(r'^login/$', views.login(template_name='registration/login.html'),{'APP_ROOT': settings.APP_ROOT}),
    url(r'^accounts/login/$', 'django.contrib.auth.views.login', {'template_name': 'registration/login.html', 'authentication_form': AuthenticationForm }),
    url(r'^accounts/logout/$', 'formshare.apps.main.registration_views.LogoutView'),
)

registration_views.py

...
def LogoutView(request):
    logout(request)
    return render(request, "registration/logout.html",{'APP_ROOT': settings.APP_ROOT})
...

但它似乎不起作用！ APP_ROOT在设置中定义，我在许多其他视图和模板中使用它。但是注销模板没有获得变量APP_ROOT

非常感谢任何想法。