Django user.is_authenticated在视图中工作,但不在模板中工作

def login_user(request):
c = {}
c.update(csrf(request))

username = password = ''
if request.POST:
    username = request.POST.get('username')
    password = request.POST.get('password')

    user = authenticate(username=username,password=password)
    if user is not None:
        if user.is_active:
            login(request,user)
            c.update(user(request))
            return redirect('/module/')
        else:
            return redirect('/inactive/')
    else:
        return redirect('/failure/')

return render_to_response('core/auth.html',c)

这正确登录用户,因为我可以访问django管理页面,如果我在我的超级用户.

登录并重定向后,我想在屏幕上显示用户名,目前我正在使用

{% if user.is_authenticated %}
            <p class="navbar-text pull-right">Welcome,{{ user.username }}. Thanks for logging in.</p>
          {% else %}
            <p class="navbar-text pull-right">Welcome,new user. Please log in.</p>
          {% endif %}

但它似乎总是相信用户没有登录.任何帮助将不胜感激.

编辑：这是我的模板上下文处理器

TEMPLATE_CONTEXT_PROCESSORS = (
 "django.contrib.auth.context_processors.auth","django.core.context_processors.debug","django.core.context_processors.i18n","django.core.context_processors.media","django.core.context_processors.static","django.core.context_processors.tz","django.contrib.messages.context_processors.messages","django.core.context_processors.request",)