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Preemptively reduce the precision of floating point positions so that it does not change in a round-trip through the database backend.

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#5160
This commit is contained in:
Kevin Turner 2017-05-22 17:33:44 -07:00
parent afc0367402
commit e9df63a467
1 changed files with 11 additions and 0 deletions
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11
rest_framework/pagination.py
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@ -7,6 +7,7 @@ from __future__ import unicode_literals
from base64 import b64decode, b64encode
from collections import OrderedDict, namedtuple
import decimal
from django.core.paginator import Paginator as DjangoPaginator
from django.core.paginator import InvalidPage
@ -488,6 +489,9 @@ class CursorPagination(BasePagination):
# queries, by having a hard cap on the maximum possible size of the offset.
offset_cutoff = 1000
__rounding_down = decimal.Context(prec=14, rounding=decimal.ROUND_FLOOR)
__rounding_up = decimal.Context(prec=14, rounding=decimal.ROUND_CEILING)
def paginate_queryset(self, queryset, request, view=None):
self.page_size = self.get_page_size(request)
if not self.page_size:
@ -756,6 +760,13 @@ class CursorPagination(BasePagination):
attr = instance[field_name]
else:
attr = getattr(instance, field_name)
if isinstance(attr, float):
if ordering[0][0] == '-':
attr = self.__rounding_down.create_decimal_from_float(attr)
else:
attr = self.__rounding_up.create_decimal_from_float(attr)
return six.text_type(attr)
def get_paginated_response(self, data):