mirror of
https://github.com/django/django.git
synced 2024-11-30 07:06:18 +01:00
fbfa654a15
This allows for Paginator subclasses to easily override the Page class that gets used. Took the opportunity to also do some non-invasive PEP8 tidying of the paginator module.
306 lines
13 KiB
Python
306 lines
13 KiB
Python
from __future__ import absolute_import, unicode_literals
|
|
|
|
from datetime import datetime
|
|
|
|
from django.core.paginator import (Paginator, EmptyPage, InvalidPage,
|
|
PageNotAnInteger)
|
|
from django.test import TestCase
|
|
from django.utils import six
|
|
from django.utils import unittest
|
|
|
|
from .models import Article
|
|
from .custom import ValidAdjacentNumsPaginator
|
|
|
|
|
|
class PaginationTests(unittest.TestCase):
|
|
"""
|
|
Tests for the Paginator and Page classes.
|
|
"""
|
|
|
|
def check_paginator(self, params, output):
|
|
"""
|
|
Helper method that instantiates a Paginator object from the passed
|
|
params and then checks that its attributes match the passed output.
|
|
"""
|
|
count, num_pages, page_range = output
|
|
paginator = Paginator(*params)
|
|
self.check_attribute('count', paginator, count, params)
|
|
self.check_attribute('num_pages', paginator, num_pages, params)
|
|
self.check_attribute('page_range', paginator, page_range, params, coerce=list)
|
|
|
|
def check_attribute(self, name, paginator, expected, params, coerce=None):
|
|
"""
|
|
Helper method that checks a single attribute and gives a nice error
|
|
message upon test failure.
|
|
"""
|
|
got = getattr(paginator, name)
|
|
if coerce is not None:
|
|
got = coerce(got)
|
|
self.assertEqual(expected, got,
|
|
"For '%s', expected %s but got %s. Paginator parameters were: %s"
|
|
% (name, expected, got, params))
|
|
|
|
def test_paginator(self):
|
|
"""
|
|
Tests the paginator attributes using varying inputs.
|
|
"""
|
|
nine = [1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
ten = nine + [10]
|
|
eleven = ten + [11]
|
|
tests = (
|
|
# Each item is two tuples:
|
|
# First tuple is Paginator parameters - object_list, per_page,
|
|
# orphans, and allow_empty_first_page.
|
|
# Second tuple is resulting Paginator attributes - count,
|
|
# num_pages, and page_range.
|
|
# Ten items, varying orphans, no empty first page.
|
|
((ten, 4, 0, False), (10, 3, [1, 2, 3])),
|
|
((ten, 4, 1, False), (10, 3, [1, 2, 3])),
|
|
((ten, 4, 2, False), (10, 2, [1, 2])),
|
|
((ten, 4, 5, False), (10, 2, [1, 2])),
|
|
((ten, 4, 6, False), (10, 1, [1])),
|
|
# Ten items, varying orphans, allow empty first page.
|
|
((ten, 4, 0, True), (10, 3, [1, 2, 3])),
|
|
((ten, 4, 1, True), (10, 3, [1, 2, 3])),
|
|
((ten, 4, 2, True), (10, 2, [1, 2])),
|
|
((ten, 4, 5, True), (10, 2, [1, 2])),
|
|
((ten, 4, 6, True), (10, 1, [1])),
|
|
# One item, varying orphans, no empty first page.
|
|
(([1], 4, 0, False), (1, 1, [1])),
|
|
(([1], 4, 1, False), (1, 1, [1])),
|
|
(([1], 4, 2, False), (1, 1, [1])),
|
|
# One item, varying orphans, allow empty first page.
|
|
(([1], 4, 0, True), (1, 1, [1])),
|
|
(([1], 4, 1, True), (1, 1, [1])),
|
|
(([1], 4, 2, True), (1, 1, [1])),
|
|
# Zero items, varying orphans, no empty first page.
|
|
(([], 4, 0, False), (0, 0, [])),
|
|
(([], 4, 1, False), (0, 0, [])),
|
|
(([], 4, 2, False), (0, 0, [])),
|
|
# Zero items, varying orphans, allow empty first page.
|
|
(([], 4, 0, True), (0, 1, [1])),
|
|
(([], 4, 1, True), (0, 1, [1])),
|
|
(([], 4, 2, True), (0, 1, [1])),
|
|
# Number if items one less than per_page.
|
|
(([], 1, 0, True), (0, 1, [1])),
|
|
(([], 1, 0, False), (0, 0, [])),
|
|
(([1], 2, 0, True), (1, 1, [1])),
|
|
((nine, 10, 0, True), (9, 1, [1])),
|
|
# Number if items equal to per_page.
|
|
(([1], 1, 0, True), (1, 1, [1])),
|
|
(([1, 2], 2, 0, True), (2, 1, [1])),
|
|
((ten, 10, 0, True), (10, 1, [1])),
|
|
# Number if items one more than per_page.
|
|
(([1, 2], 1, 0, True), (2, 2, [1, 2])),
|
|
(([1, 2, 3], 2, 0, True), (3, 2, [1, 2])),
|
|
((eleven, 10, 0, True), (11, 2, [1, 2])),
|
|
# Number if items one more than per_page with one orphan.
|
|
(([1, 2], 1, 1, True), (2, 1, [1])),
|
|
(([1, 2, 3], 2, 1, True), (3, 1, [1])),
|
|
((eleven, 10, 1, True), (11, 1, [1])),
|
|
# Non-integer inputs
|
|
((ten, '4', 1, False), (10, 3, [1, 2, 3])),
|
|
((ten, '4', 1, False), (10, 3, [1, 2, 3])),
|
|
((ten, 4, '1', False), (10, 3, [1, 2, 3])),
|
|
((ten, 4, '1', False), (10, 3, [1, 2, 3])),
|
|
)
|
|
for params, output in tests:
|
|
self.check_paginator(params, output)
|
|
|
|
def test_invalid_page_number(self):
|
|
"""
|
|
Tests that invalid page numbers result in the correct exception being
|
|
raised.
|
|
"""
|
|
paginator = Paginator([1, 2, 3], 2)
|
|
self.assertRaises(InvalidPage, paginator.page, 3)
|
|
self.assertRaises(PageNotAnInteger, paginator.validate_number, None)
|
|
self.assertRaises(PageNotAnInteger, paginator.validate_number, 'x')
|
|
# With no content and allow_empty_first_page=True, 1 is a valid page number
|
|
paginator = Paginator([], 2)
|
|
self.assertEqual(paginator.validate_number(1), 1)
|
|
|
|
def test_paginate_misc_classes(self):
|
|
class CountContainer(object):
|
|
def count(self):
|
|
return 42
|
|
# Paginator can be passed other objects with a count() method.
|
|
paginator = Paginator(CountContainer(), 10)
|
|
self.assertEqual(42, paginator.count)
|
|
self.assertEqual(5, paginator.num_pages)
|
|
self.assertEqual([1, 2, 3, 4, 5], list(paginator.page_range))
|
|
|
|
# Paginator can be passed other objects that implement __len__.
|
|
class LenContainer(object):
|
|
def __len__(self):
|
|
return 42
|
|
paginator = Paginator(LenContainer(), 10)
|
|
self.assertEqual(42, paginator.count)
|
|
self.assertEqual(5, paginator.num_pages)
|
|
self.assertEqual([1, 2, 3, 4, 5], list(paginator.page_range))
|
|
|
|
def check_indexes(self, params, page_num, indexes):
|
|
"""
|
|
Helper method that instantiates a Paginator object from the passed
|
|
params and then checks that the start and end indexes of the passed
|
|
page_num match those given as a 2-tuple in indexes.
|
|
"""
|
|
paginator = Paginator(*params)
|
|
if page_num == 'first':
|
|
page_num = 1
|
|
elif page_num == 'last':
|
|
page_num = paginator.num_pages
|
|
page = paginator.page(page_num)
|
|
start, end = indexes
|
|
msg = ("For %s of page %s, expected %s but got %s."
|
|
" Paginator parameters were: %s")
|
|
self.assertEqual(start, page.start_index(),
|
|
msg % ('start index', page_num, start, page.start_index(), params))
|
|
self.assertEqual(end, page.end_index(),
|
|
msg % ('end index', page_num, end, page.end_index(), params))
|
|
|
|
def test_page_indexes(self):
|
|
"""
|
|
Tests that paginator pages have the correct start and end indexes.
|
|
"""
|
|
ten = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
tests = (
|
|
# Each item is three tuples:
|
|
# First tuple is Paginator parameters - object_list, per_page,
|
|
# orphans, and allow_empty_first_page.
|
|
# Second tuple is the start and end indexes of the first page.
|
|
# Third tuple is the start and end indexes of the last page.
|
|
# Ten items, varying per_page, no orphans.
|
|
((ten, 1, 0, True), (1, 1), (10, 10)),
|
|
((ten, 2, 0, True), (1, 2), (9, 10)),
|
|
((ten, 3, 0, True), (1, 3), (10, 10)),
|
|
((ten, 5, 0, True), (1, 5), (6, 10)),
|
|
# Ten items, varying per_page, with orphans.
|
|
((ten, 1, 1, True), (1, 1), (9, 10)),
|
|
((ten, 1, 2, True), (1, 1), (8, 10)),
|
|
((ten, 3, 1, True), (1, 3), (7, 10)),
|
|
((ten, 3, 2, True), (1, 3), (7, 10)),
|
|
((ten, 3, 4, True), (1, 3), (4, 10)),
|
|
((ten, 5, 1, True), (1, 5), (6, 10)),
|
|
((ten, 5, 2, True), (1, 5), (6, 10)),
|
|
((ten, 5, 5, True), (1, 10), (1, 10)),
|
|
# One item, varying orphans, no empty first page.
|
|
(([1], 4, 0, False), (1, 1), (1, 1)),
|
|
(([1], 4, 1, False), (1, 1), (1, 1)),
|
|
(([1], 4, 2, False), (1, 1), (1, 1)),
|
|
# One item, varying orphans, allow empty first page.
|
|
(([1], 4, 0, True), (1, 1), (1, 1)),
|
|
(([1], 4, 1, True), (1, 1), (1, 1)),
|
|
(([1], 4, 2, True), (1, 1), (1, 1)),
|
|
# Zero items, varying orphans, allow empty first page.
|
|
(([], 4, 0, True), (0, 0), (0, 0)),
|
|
(([], 4, 1, True), (0, 0), (0, 0)),
|
|
(([], 4, 2, True), (0, 0), (0, 0)),
|
|
)
|
|
for params, first, last in tests:
|
|
self.check_indexes(params, 'first', first)
|
|
self.check_indexes(params, 'last', last)
|
|
|
|
# When no items and no empty first page, we should get EmptyPage error.
|
|
self.assertRaises(EmptyPage, self.check_indexes, ([], 4, 0, False), 1, None)
|
|
self.assertRaises(EmptyPage, self.check_indexes, ([], 4, 1, False), 1, None)
|
|
self.assertRaises(EmptyPage, self.check_indexes, ([], 4, 2, False), 1, None)
|
|
|
|
def test_page_sequence(self):
|
|
"""
|
|
Tests that a paginator page acts like a standard sequence.
|
|
"""
|
|
eleven = 'abcdefghijk'
|
|
page2 = Paginator(eleven, per_page=5, orphans=1).page(2)
|
|
self.assertEqual(len(page2), 6)
|
|
self.assertTrue('k' in page2)
|
|
self.assertFalse('a' in page2)
|
|
self.assertEqual(''.join(page2), 'fghijk')
|
|
self.assertEqual(''.join(reversed(page2)), 'kjihgf')
|
|
|
|
def test_get_page_hook(self):
|
|
"""
|
|
Tests that a Paginator subclass can use the ``_get_page`` hook to
|
|
return an alternative to the standard Page class.
|
|
"""
|
|
eleven = 'abcdefghijk'
|
|
paginator = ValidAdjacentNumsPaginator(eleven, per_page=6)
|
|
page1 = paginator.page(1)
|
|
page2 = paginator.page(2)
|
|
self.assertEquals(page1.previous_page_number(), None)
|
|
self.assertEquals(page1.next_page_number(), 2)
|
|
self.assertEquals(page2.previous_page_number(), 1)
|
|
self.assertEquals(page2.next_page_number(), None)
|
|
|
|
|
|
class ModelPaginationTests(TestCase):
|
|
"""
|
|
Test pagination with Django model instances
|
|
"""
|
|
def setUp(self):
|
|
# Prepare a list of objects for pagination.
|
|
for x in range(1, 10):
|
|
a = Article(headline='Article %s' % x, pub_date=datetime(2005, 7, 29))
|
|
a.save()
|
|
|
|
def test_first_page(self):
|
|
paginator = Paginator(Article.objects.all(), 5)
|
|
p = paginator.page(1)
|
|
self.assertEqual("<Page 1 of 2>", six.text_type(p))
|
|
self.assertQuerysetEqual(p.object_list, [
|
|
"<Article: Article 1>",
|
|
"<Article: Article 2>",
|
|
"<Article: Article 3>",
|
|
"<Article: Article 4>",
|
|
"<Article: Article 5>"
|
|
]
|
|
)
|
|
self.assertTrue(p.has_next())
|
|
self.assertFalse(p.has_previous())
|
|
self.assertTrue(p.has_other_pages())
|
|
self.assertEqual(2, p.next_page_number())
|
|
self.assertRaises(InvalidPage, p.previous_page_number)
|
|
self.assertEqual(1, p.start_index())
|
|
self.assertEqual(5, p.end_index())
|
|
|
|
def test_last_page(self):
|
|
paginator = Paginator(Article.objects.all(), 5)
|
|
p = paginator.page(2)
|
|
self.assertEqual("<Page 2 of 2>", six.text_type(p))
|
|
self.assertQuerysetEqual(p.object_list, [
|
|
"<Article: Article 6>",
|
|
"<Article: Article 7>",
|
|
"<Article: Article 8>",
|
|
"<Article: Article 9>"
|
|
]
|
|
)
|
|
self.assertFalse(p.has_next())
|
|
self.assertTrue(p.has_previous())
|
|
self.assertTrue(p.has_other_pages())
|
|
self.assertRaises(InvalidPage, p.next_page_number)
|
|
self.assertEqual(1, p.previous_page_number())
|
|
self.assertEqual(6, p.start_index())
|
|
self.assertEqual(9, p.end_index())
|
|
|
|
def test_page_getitem(self):
|
|
"""
|
|
Tests proper behaviour of a paginator page __getitem__ (queryset
|
|
evaluation, slicing, exception raised).
|
|
"""
|
|
paginator = Paginator(Article.objects.all(), 5)
|
|
p = paginator.page(1)
|
|
|
|
# Make sure object_list queryset is not evaluated by an invalid __getitem__ call.
|
|
# (this happens from the template engine when using eg: {% page_obj.has_previous %})
|
|
self.assertIsNone(p.object_list._result_cache)
|
|
self.assertRaises(TypeError, lambda: p['has_previous'])
|
|
self.assertIsNone(p.object_list._result_cache)
|
|
|
|
# Make sure slicing the Page object with numbers and slice objects work.
|
|
self.assertEqual(p[0], Article.objects.get(headline='Article 1'))
|
|
self.assertQuerysetEqual(p[slice(2)], [
|
|
"<Article: Article 1>",
|
|
"<Article: Article 2>",
|
|
]
|
|
)
|