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Fixed #26290 -- Warned that paginating an unordered QuerySet may result in inconsistent results.

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This commit is contained in:
Emad Mokhtar 2016-06-07 14:24:19 +03:00 • committed by Tim Graham
parent 724dd2043e
commit c4980e28e5
5 changed files with 38 additions and 13 deletions
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26
tests/pagination/tests.py
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@ -5,6 +5,7 @@ from datetime import datetime
from django.core.paginator import (
EmptyPage, InvalidPage, PageNotAnInteger, Paginator,
UnorderedObjectListWarning,
)
from django.test import TestCase
from django.utils import six
@ -256,7 +257,7 @@ class ModelPaginationTests(TestCase):
a.save()
def test_first_page(self):
paginator = Paginator(Article.objects.all(), 5)
paginator = Paginator(Article.objects.order_by('id'), 5)
p = paginator.page(1)
self.assertEqual("<Page 1 of 2>", six.text_type(p))
self.assertQuerysetEqual(p.object_list, [
@ -265,9 +266,7 @@ class ModelPaginationTests(TestCase):
"<Article: Article 3>",
"<Article: Article 4>",
"<Article: Article 5>"
],
ordered=False
)
])
self.assertTrue(p.has_next())
self.assertFalse(p.has_previous())
self.assertTrue(p.has_other_pages())
@ -278,7 +277,7 @@ class ModelPaginationTests(TestCase):
self.assertEqual(5, p.end_index())
def test_last_page(self):
paginator = Paginator(Article.objects.all(), 5)
paginator = Paginator(Article.objects.order_by('id'), 5)
p = paginator.page(2)
self.assertEqual("<Page 2 of 2>", six.text_type(p))
self.assertQuerysetEqual(p.object_list, [
@ -286,9 +285,7 @@ class ModelPaginationTests(TestCase):
"<Article: Article 7>",
"<Article: Article 8>",
"<Article: Article 9>"
],
ordered=False
)
])
self.assertFalse(p.has_next())
self.assertTrue(p.has_previous())
self.assertTrue(p.has_other_pages())
@ -303,7 +300,7 @@ class ModelPaginationTests(TestCase):
Tests proper behavior of a paginator page __getitem__ (queryset
evaluation, slicing, exception raised).
"""
paginator = Paginator(Article.objects.all(), 5)
paginator = Paginator(Article.objects.order_by('id'), 5)
p = paginator.page(1)
# Make sure object_list queryset is not evaluated by an invalid __getitem__ call.
@ -323,3 +320,14 @@ class ModelPaginationTests(TestCase):
)
# After __getitem__ is called, object_list is a list
self.assertIsInstance(p.object_list, list)
def test_paginating_unordered_queryset_raises_warning(self):
msg = (
"Pagination may yield inconsistent results with an unordered "
"object_list: <QuerySet [<Article: Article 1>, "
"<Article: Article 2>, <Article: Article 3>, <Article: Article 4>, "
"<Article: Article 5>, <Article: Article 6>, <Article: Article 7>, "
"<Article: Article 8>, <Article: Article 9>]>"
)
with self.assertRaisesMessage(UnorderedObjectListWarning, msg):
Paginator(Article.objects.all(), 5)