@login_required
def logout_student(request):
    logout(request)
    # Redirect to a success page.
    return HttpResponseRedirect('/index/')

def logout(request):
    """
    Removes the authenticated user's ID from the request and flushes their
    session data.
    """
    # Dispatch the signal before the user is logged out so the receivers have a
    # chance to find out *who* logged out.
    user = getattr(request, 'user', None)
    if hasattr(user, 'is_authenticated') and not user.is_authenticated():
        user = None
    user_logged_out.send(sender=user.__class__, request=request, user=user)

    request.session.flush()
    if hasattr(request, 'user'):
        from django.contrib.auth.models import AnonymousUser
        request.user = AnonymousUser()

def delete(self, session_key=None):
    if session_key is None:
        if self.session_key is None:
            return
        session_key = self.session_key
    try:
        Session.objects.get(session_key=session_key).delete()
    except Session.DoesNotExist:
        pass