python - Django 全局名称 'PageNotAnInteger' 未定义

Question

我有一个奇怪的问题。我有一个 View 通过 Django REST Framework 的序列化器和分页器返回一些 JSON。

我的 View 看起来像这样(返回 Countries 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)

这很好用。

但是我需要返回具有特定 ID 的国家/地区，我正在尝试这样做:

@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)

我显然用 geonames_ids 参数调用了 URL。它给出了一个错误:global name 'PageNotAnInteger' is not defined 指的是当时的异常。

我的代码有问题吗？在更改查询集之前找到 PageNotAnInteger 的原因是没有意义的。

Answer 1

你应该先导入它:

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