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今天在Django restful api中遇到一个问题，后端用到pagination_class，用来实现分页，但是我想在api调用过程知道一共有多少页。
直接看代码：
from rest_framework.pagination import PageNumberPagination
from django.core.paginator import InvalidPage
from rest_framework.exceptions import NotFound
from django.utils import six
class StandardResultsSetPagination(PageNumberPagination):
page_size = 10
page_size_query_param = 'page_size'
max_page_size = 100
def paginate_queryset(self, queryset, request, view=None):
"""
Paginate a queryset if required, either returning a
page object, or `None` if pagination is not configured for this view.
"""
page_size = self.get_page_size(request)
if not page_size:
return None
paginator = self.django_paginator_class(queryset, page_size)
page_number = request.query_params.get(self.page_query_param, 1)
if page_number in self.last_page_strings:
page_number = paginator.num_pages
try:
self.page = paginator.page(page_number)
except InvalidPage as exc:
msg = self.invalid_page_message.format(
page_number=page_number, message=six.text_type(exc)
)
raise NotFound(msg)
if paginator.num_pages > 1 and self.template is not None:
# The browsable API should display pagination controls.
self.display_page_controls = True
self.request = request
return list(self.page), paginator.num_pages
class WorkOrderAPI(generics.GenericAPIView):
serializer_class = WorkOrderSerializer
queryset = WorkOrder.objects.all()
pagination_class = StandardResultsSetPagination
filter_backends = (DjangoFilterBackend, filters.SearchFilter)
filter_fields = ('status',)
search_fields = ('orderid',)
def get(self, request, format=None):
work_order_status = request.GET.get('status','')
if work_order_status == '5':
query = self.queryset.filter(assessor=request.user.account.name)
# rest_framework.pagination里面paginate_queryset返回的只有分页后的对象，我这里为什么能返回最大页码呢，查看源代码之后，重写paginate_queryset。自己返回即可
page_list, num_pages = self.paginate_queryset(query)
else:
query = self.get_queryset()
page_list, num_pages = self.paginate_queryset(self.filter_queryset(query))
serializer = self.serializer_class((page_list), many=True)
json_data = {}
json_data["data"] = serializer.data
json_data["num_pages"] = num_pages
return Response(json_data, status=status.HTTP_200_OK)