Error with paginating the exact number of records as json result in django

问题

My problem is that my returning json is not the expecting one based on the limit that I have given to my paginator.

For example, when I am giving the limit 11 to define the number of my returning results per page, after the request the paginator returns only 10.

This happens when I am requesting records above 10. Below 10 the json result is right.

my view

class ProductSerialNumbersListJSon(LoginRequiredMixin,BaseDatatableView):
    # my model
    model = ProductSerialNumbers
    columns = ['snumber' , 'order_id','product','registration_date']
    order_columns = ['snumber','order_id','product','registration_date']
    paginate_by = 11

    def get_initial_queryset(self):
        #fetch the query list from db
        query_list=ProductSerialNumbers.objects.filter(Q(snumber__isnull=True)|Q(order_id__isnull=True)|Q (order_id__finished=0)).order_by("id")
        #declare the Paginator
        paginator = Paginator(query_list,self.paginate_by) # 11 items per page
        #getting the page number from the kwargs of the url
        page=int(self.kwargs['page'])

        try:
            result = paginator.page(page)
        except PageNotAnInteger:
            result = paginator.page(1)
        except EmptyPage:
            result = paginator.page(paginator.num_pages)

        product_serials = result.object_list.all().values_list('pk', flat=True)
        result=ProductSerialNumbers.objects.filter(pk__in=list(product_serials))
        return ProductSerialNumbers.objects.filter(pk__in=list(product_serials))

my json result

{"recordsTotal": 11, "recordsFiltered": 11, "draw": 0, "data": [["3", "", "test_proion", "2019-01-16"], ["55", "", "test_proion", "2019-01-16"], ["56", "", "test_proion", "2019-01-16"], ["57", "", "test_proion", "2019-01-16"], ["58", "", "test_proion", "2019-01-16"], ["59", "", "test_proion", "2019-01-16"], ["60", "", "test_proion", "2019-01-16"], ["61", "", "test_proion", "2019-01-16"], ["62", "", "test_proion", "2019-01-16"], ["63", "", "test_proion", "2019-01-16"]], "result": "ok"}

Despite the fact that the recordsTotal and the recordsFiltered variable are returning both 11, the actual json returns 10 records.

Why this happening;

来源：https://stackoverflow.com/questions/54863503/error-with-paginating-the-exact-number-of-records-as-json-result-in-django

标签

django

pagination

server-side

paginator