[FIXED] Django Rest 'PageNumberPagination' object has no attribute 'page' error

Issue

I have a function based Django API as shown in this sample:

@api_view(['GET'])
def findData(request):
    dataId = request.GET['dataId']
    page_query_param = 'page'
    page_size = request.GET['page_size']
    paginator = PageNumberPagination()
    paginator.page_size = page_size
    paginator.page_query_param = page_query_param
    qry_set = Data.objects.all()
    serializer = dataIdSerializer(qry_set, many=True)
    theData= serializer.data
    return Response(paginator.get_paginated_response(theData))

But I keep getting this error:

AttributeError: 'PageNumberPagination' object has no attribute 'page'

I tried setting

paginator.page_query_param = page_query_param

But still same problem. Please advise of how to fix.

Solution

It is likely more effective to use a ListView, not only this will remove a lot of boilerplate code, but also is likely less error prone. You can just subclass the paginator to your own:

class MyPaginator(PageNumberPagination):
    page_size = 100
    page_size_query_param = 'page_size'
    max_page_size = 1000

Then in the ListView, we can make use of the MyPaginator:

from rest_framework import generics

class DataListView(generics.ListAPIView):
    queryset = Data.objects.all()
    serializer_class = dataIdSerializer
    pagination_class = MyPaginator

    def get_queryset(self, *args, **kwargs):
        dataId = self.request.GET['dataId']
        super().get_queryset(*args, **kwargs).filter(
            # …
        )

Here you can filter the queryset in the get_queryset method to only use Data objects that satisfy a given condition.

In the urls, you can then finally link it with .as_view():

urlpatterns = [
    path('/findData', DataListView.as_view())
]

Answered By - Willem Van Onsem