python - Django全局名称'PageNotAnInteger'未定义

我有个奇怪的问题。我有一个视图，它通过django rest框架中的序列化器和分页器返回一些json。
我的视图如下（返回国家/地区模型中的所有对象）：

@api_view(['GET'])
def country_list(request):
    """
    List all countries
    """
    if request.method == 'GET':

        geoname_ids = request.QUERY_PARAMS.get('geoname_ids')
        queryset = Countries.objects.all()
        paginator = Paginator(queryset, request.QUERY_PARAMS.get('limit'))
        page = request.QUERY_PARAMS.get('page')

        try:
            countries = paginator.page(page)
        except PageNotAnInteger:
            #If page is not an integer, deliver first page.
            countries = paginator.page(1)
        except EmptyPage:
            #If page is out of range
            #Delivery last page of results
            countries = paginator.page(paginator.num_pages)

        serializer_context = {'request': request}
        serializer = PaginatedCountrySerializer(countries, context=serializer_context)
        return Response(serializer.data)

这很管用。
不过，我需要返回一个具有特定ID的国家，我正在尝试：

@api_view(['GET'])
def country_list(request):
    """
    List all countries
    """
    if request.method == 'GET':

        geoname_ids = request.QUERY_PARAMS.get('geoname_ids')
        queryset = Countries.objects.filter(country_geoname_id=geoname_ids)
        paginator = Paginator(queryset, request.QUERY_PARAMS.get('limit'))
        page = request.QUERY_PARAMS.get('page')

        try:
            countries = paginator.page(page)
        except PageNotAnInteger:
            #If page is not an integer, deliver first page.
            countries = paginator.page(1)
        except EmptyPage:
            #If page is out of range
            #Delivery last page of results
            countries = paginator.page(paginator.num_pages)

        serializer_context = {'request': request}
        serializer = PaginatedCountrySerializer(countries, context=serializer_context)
        return Response(serializer.data)

很明显，我用geonames\uids参数调用url。它给出了一个错误：global name 'PageNotAnInteger' is not defined引用then异常。
我的代码有问题吗？在更改queryset之前，pagenotainteger为什么要先找到工作，这是不合理的。

最佳答案

您应该先导入它：

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger