Django中的“ NoReverseMatch”问题

Question

在/ en-us / schools / 1 / classroom / 1 / update /

的NoReverseMatch

找不到带有参数'（''，）'的'index'的反向。尝试了1种模式：['zh-cn / schools /（？P \ d +）/ index / $']

urls.py

    url(r'^(?P<school_id>\d+)/index/$', views.index, name='index'),

    url(r'^(?P<school_id>\d+)/classroom/(?P<classroom_id>\d+)/update/$', 
    views.ClassroomUpdateView.as_view(), name='classroom_update')

views.py

    def index(request, school_id):
        school = get_object_or_404(School, pk=school_id)
        classroom = school.classroom_set.all()
        student_count = school.student_set.count()
        guardian_count = school.guardian_set.count()
        employee_count = school.employee_set.count()
        teacher_count = school.teacher_set.count()
        context = {
            'school': school,
            'classroom': classroom,
            'student_count': student_count,
            'guardian_count': guardian_count,
            'employee_count': employee_count,
            'teacher_count': teacher_count,

        }
        return render(request, 'home/home.html', context)



    class ClassroomUpdateView(UpdateView):
        model = Classroom
        fields = ('classroom', 'numeric_name', 'class_teacher', 'note',)
        template_name = 'classrooms/classroom_update.html'
        pk_url_kwarg = 'classroom_id'
        context_object_name = 'classroom'

        def form_valid(self, form):
            classroom = form.save(commit=False)
            classroom.save()
            return redirect('classroom_list', school_id=classroom.school.pk)