mirror of
https://github.com/django/django.git
synced 2024-11-28 21:43:13 +01:00
586 lines
24 KiB
Python
586 lines
24 KiB
Python
import collections.abc
|
|
import unittest.mock
|
|
import warnings
|
|
from datetime import datetime
|
|
|
|
from django.core.paginator import (
|
|
EmptyPage,
|
|
InvalidPage,
|
|
PageNotAnInteger,
|
|
Paginator,
|
|
UnorderedObjectListWarning,
|
|
)
|
|
from django.test import SimpleTestCase, TestCase
|
|
|
|
from .custom import ValidAdjacentNumsPaginator
|
|
from .models import Article
|
|
|
|
|
|
class PaginationTests(SimpleTestCase):
|
|
"""
|
|
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 2-tuple:
|
|
# 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):
|
|
"""
|
|
Invalid page numbers result in the correct exception being raised.
|
|
"""
|
|
paginator = Paginator([1, 2, 3], 2)
|
|
with self.assertRaises(InvalidPage):
|
|
paginator.page(3)
|
|
with self.assertRaises(PageNotAnInteger):
|
|
paginator.validate_number(None)
|
|
with self.assertRaises(PageNotAnInteger):
|
|
paginator.validate_number("x")
|
|
with self.assertRaises(PageNotAnInteger):
|
|
paginator.validate_number(1.2)
|
|
|
|
def test_error_messages(self):
|
|
error_messages = {
|
|
"invalid_page": "Wrong page number",
|
|
"min_page": "Too small",
|
|
"no_results": "There is nothing here",
|
|
}
|
|
paginator = Paginator([1, 2, 3], 2, error_messages=error_messages)
|
|
msg = "Wrong page number"
|
|
with self.assertRaisesMessage(PageNotAnInteger, msg):
|
|
paginator.validate_number(1.2)
|
|
msg = "Too small"
|
|
with self.assertRaisesMessage(EmptyPage, msg):
|
|
paginator.validate_number(-1)
|
|
msg = "There is nothing here"
|
|
with self.assertRaisesMessage(EmptyPage, msg):
|
|
paginator.validate_number(3)
|
|
|
|
error_messages = {"min_page": "Too small"}
|
|
paginator = Paginator([1, 2, 3], 2, error_messages=error_messages)
|
|
# Custom message.
|
|
msg = "Too small"
|
|
with self.assertRaisesMessage(EmptyPage, msg):
|
|
paginator.validate_number(-1)
|
|
# Default message.
|
|
msg = "That page contains no results"
|
|
with self.assertRaisesMessage(EmptyPage, msg):
|
|
paginator.validate_number(3)
|
|
|
|
def test_float_integer_page(self):
|
|
paginator = Paginator([1, 2, 3], 2)
|
|
self.assertEqual(paginator.validate_number(1.0), 1)
|
|
|
|
def test_no_content_allow_empty_first_page(self):
|
|
# 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:
|
|
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:
|
|
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 test_count_does_not_silence_attribute_error(self):
|
|
class AttributeErrorContainer:
|
|
def count(self):
|
|
raise AttributeError("abc")
|
|
|
|
with self.assertRaisesMessage(AttributeError, "abc"):
|
|
Paginator(AttributeErrorContainer(), 10).count
|
|
|
|
def test_count_does_not_silence_type_error(self):
|
|
class TypeErrorContainer:
|
|
def count(self):
|
|
raise TypeError("abc")
|
|
|
|
with self.assertRaisesMessage(TypeError, "abc"):
|
|
Paginator(TypeErrorContainer(), 10).count
|
|
|
|
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):
|
|
"""
|
|
Paginator pages have the correct start and end indexes.
|
|
"""
|
|
ten = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
tests = (
|
|
# Each item is 3-tuple:
|
|
# 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.
|
|
with self.assertRaises(EmptyPage):
|
|
self.check_indexes(([], 4, 0, False), 1, None)
|
|
with self.assertRaises(EmptyPage):
|
|
self.check_indexes(([], 4, 1, False), 1, None)
|
|
with self.assertRaises(EmptyPage):
|
|
self.check_indexes(([], 4, 2, False), 1, None)
|
|
|
|
def test_page_sequence(self):
|
|
"""
|
|
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.assertIn("k", page2)
|
|
self.assertNotIn("a", page2)
|
|
self.assertEqual("".join(page2), "fghijk")
|
|
self.assertEqual("".join(reversed(page2)), "kjihgf")
|
|
|
|
def test_get_page_hook(self):
|
|
"""
|
|
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.assertIsNone(page1.previous_page_number())
|
|
self.assertEqual(page1.next_page_number(), 2)
|
|
self.assertEqual(page2.previous_page_number(), 1)
|
|
self.assertIsNone(page2.next_page_number())
|
|
|
|
def test_page_range_iterator(self):
|
|
"""
|
|
Paginator.page_range should be an iterator.
|
|
"""
|
|
self.assertIsInstance(Paginator([1, 2, 3], 2).page_range, type(range(0)))
|
|
|
|
def test_get_page(self):
|
|
"""
|
|
Paginator.get_page() returns a valid page even with invalid page
|
|
arguments.
|
|
"""
|
|
paginator = Paginator([1, 2, 3], 2)
|
|
page = paginator.get_page(1)
|
|
self.assertEqual(page.number, 1)
|
|
self.assertEqual(page.object_list, [1, 2])
|
|
# An empty page returns the last page.
|
|
self.assertEqual(paginator.get_page(3).number, 2)
|
|
# Non-integer page returns the first page.
|
|
self.assertEqual(paginator.get_page(None).number, 1)
|
|
|
|
def test_get_page_empty_object_list(self):
|
|
"""Paginator.get_page() with an empty object_list."""
|
|
paginator = Paginator([], 2)
|
|
# An empty page returns the last page.
|
|
self.assertEqual(paginator.get_page(1).number, 1)
|
|
self.assertEqual(paginator.get_page(2).number, 1)
|
|
# Non-integer page returns the first page.
|
|
self.assertEqual(paginator.get_page(None).number, 1)
|
|
|
|
def test_get_page_empty_object_list_and_allow_empty_first_page_false(self):
|
|
"""
|
|
Paginator.get_page() raises EmptyPage if allow_empty_first_page=False
|
|
and object_list is empty.
|
|
"""
|
|
paginator = Paginator([], 2, allow_empty_first_page=False)
|
|
with self.assertRaises(EmptyPage):
|
|
paginator.get_page(1)
|
|
|
|
def test_paginator_iteration(self):
|
|
paginator = Paginator([1, 2, 3], 2)
|
|
page_iterator = iter(paginator)
|
|
for page, expected in enumerate(([1, 2], [3]), start=1):
|
|
with self.subTest(page=page):
|
|
self.assertEqual(expected, list(next(page_iterator)))
|
|
|
|
self.assertEqual(
|
|
[str(page) for page in iter(paginator)],
|
|
["<Page 1 of 2>", "<Page 2 of 2>"],
|
|
)
|
|
|
|
def test_get_elided_page_range(self):
|
|
# Paginator.validate_number() must be called:
|
|
paginator = Paginator([1, 2, 3], 2)
|
|
with unittest.mock.patch.object(paginator, "validate_number") as mock:
|
|
mock.assert_not_called()
|
|
list(paginator.get_elided_page_range(2))
|
|
mock.assert_called_with(2)
|
|
|
|
ELLIPSIS = Paginator.ELLIPSIS
|
|
|
|
# Range is not elided if not enough pages when using default arguments:
|
|
paginator = Paginator(range(10 * 100), 100)
|
|
page_range = paginator.get_elided_page_range(1)
|
|
self.assertIsInstance(page_range, collections.abc.Generator)
|
|
self.assertNotIn(ELLIPSIS, page_range)
|
|
paginator = Paginator(range(10 * 100 + 1), 100)
|
|
self.assertIsInstance(page_range, collections.abc.Generator)
|
|
page_range = paginator.get_elided_page_range(1)
|
|
self.assertIn(ELLIPSIS, page_range)
|
|
|
|
# Range should be elided if enough pages when using default arguments:
|
|
tests = [
|
|
# on_each_side=3, on_ends=2
|
|
(1, [1, 2, 3, 4, ELLIPSIS, 49, 50]),
|
|
(6, [1, 2, 3, 4, 5, 6, 7, 8, 9, ELLIPSIS, 49, 50]),
|
|
(7, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ELLIPSIS, 49, 50]),
|
|
(8, [1, 2, ELLIPSIS, 5, 6, 7, 8, 9, 10, 11, ELLIPSIS, 49, 50]),
|
|
(43, [1, 2, ELLIPSIS, 40, 41, 42, 43, 44, 45, 46, ELLIPSIS, 49, 50]),
|
|
(44, [1, 2, ELLIPSIS, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50]),
|
|
(45, [1, 2, ELLIPSIS, 42, 43, 44, 45, 46, 47, 48, 49, 50]),
|
|
(50, [1, 2, ELLIPSIS, 47, 48, 49, 50]),
|
|
]
|
|
paginator = Paginator(range(5000), 100)
|
|
for number, expected in tests:
|
|
with self.subTest(number=number):
|
|
page_range = paginator.get_elided_page_range(number)
|
|
self.assertIsInstance(page_range, collections.abc.Generator)
|
|
self.assertEqual(list(page_range), expected)
|
|
|
|
# Range is not elided if not enough pages when using custom arguments:
|
|
tests = [
|
|
(6, 2, 1, 1),
|
|
(8, 1, 3, 1),
|
|
(8, 4, 0, 1),
|
|
(4, 1, 1, 1),
|
|
# When on_each_side and on_ends are both <= 1 but not both == 1 it
|
|
# is a special case where the range is not elided until an extra
|
|
# page is added.
|
|
(2, 0, 1, 2),
|
|
(2, 1, 0, 2),
|
|
(1, 0, 0, 2),
|
|
]
|
|
for pages, on_each_side, on_ends, elided_after in tests:
|
|
for offset in range(elided_after + 1):
|
|
with self.subTest(
|
|
pages=pages,
|
|
offset=elided_after,
|
|
on_each_side=on_each_side,
|
|
on_ends=on_ends,
|
|
):
|
|
paginator = Paginator(range((pages + offset) * 100), 100)
|
|
page_range = paginator.get_elided_page_range(
|
|
1,
|
|
on_each_side=on_each_side,
|
|
on_ends=on_ends,
|
|
)
|
|
self.assertIsInstance(page_range, collections.abc.Generator)
|
|
if offset < elided_after:
|
|
self.assertNotIn(ELLIPSIS, page_range)
|
|
else:
|
|
self.assertIn(ELLIPSIS, page_range)
|
|
|
|
# Range should be elided if enough pages when using custom arguments:
|
|
tests = [
|
|
# on_each_side=2, on_ends=1
|
|
(1, 2, 1, [1, 2, 3, ELLIPSIS, 50]),
|
|
(4, 2, 1, [1, 2, 3, 4, 5, 6, ELLIPSIS, 50]),
|
|
(5, 2, 1, [1, 2, 3, 4, 5, 6, 7, ELLIPSIS, 50]),
|
|
(6, 2, 1, [1, ELLIPSIS, 4, 5, 6, 7, 8, ELLIPSIS, 50]),
|
|
(45, 2, 1, [1, ELLIPSIS, 43, 44, 45, 46, 47, ELLIPSIS, 50]),
|
|
(46, 2, 1, [1, ELLIPSIS, 44, 45, 46, 47, 48, 49, 50]),
|
|
(47, 2, 1, [1, ELLIPSIS, 45, 46, 47, 48, 49, 50]),
|
|
(50, 2, 1, [1, ELLIPSIS, 48, 49, 50]),
|
|
# on_each_side=1, on_ends=3
|
|
(1, 1, 3, [1, 2, ELLIPSIS, 48, 49, 50]),
|
|
(5, 1, 3, [1, 2, 3, 4, 5, 6, ELLIPSIS, 48, 49, 50]),
|
|
(6, 1, 3, [1, 2, 3, 4, 5, 6, 7, ELLIPSIS, 48, 49, 50]),
|
|
(7, 1, 3, [1, 2, 3, ELLIPSIS, 6, 7, 8, ELLIPSIS, 48, 49, 50]),
|
|
(44, 1, 3, [1, 2, 3, ELLIPSIS, 43, 44, 45, ELLIPSIS, 48, 49, 50]),
|
|
(45, 1, 3, [1, 2, 3, ELLIPSIS, 44, 45, 46, 47, 48, 49, 50]),
|
|
(46, 1, 3, [1, 2, 3, ELLIPSIS, 45, 46, 47, 48, 49, 50]),
|
|
(50, 1, 3, [1, 2, 3, ELLIPSIS, 49, 50]),
|
|
# on_each_side=4, on_ends=0
|
|
(1, 4, 0, [1, 2, 3, 4, 5, ELLIPSIS]),
|
|
(5, 4, 0, [1, 2, 3, 4, 5, 6, 7, 8, 9, ELLIPSIS]),
|
|
(6, 4, 0, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ELLIPSIS]),
|
|
(7, 4, 0, [ELLIPSIS, 3, 4, 5, 6, 7, 8, 9, 10, 11, ELLIPSIS]),
|
|
(44, 4, 0, [ELLIPSIS, 40, 41, 42, 43, 44, 45, 46, 47, 48, ELLIPSIS]),
|
|
(45, 4, 0, [ELLIPSIS, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50]),
|
|
(46, 4, 0, [ELLIPSIS, 42, 43, 44, 45, 46, 47, 48, 49, 50]),
|
|
(50, 4, 0, [ELLIPSIS, 46, 47, 48, 49, 50]),
|
|
# on_each_side=0, on_ends=1
|
|
(1, 0, 1, [1, ELLIPSIS, 50]),
|
|
(2, 0, 1, [1, 2, ELLIPSIS, 50]),
|
|
(3, 0, 1, [1, 2, 3, ELLIPSIS, 50]),
|
|
(4, 0, 1, [1, ELLIPSIS, 4, ELLIPSIS, 50]),
|
|
(47, 0, 1, [1, ELLIPSIS, 47, ELLIPSIS, 50]),
|
|
(48, 0, 1, [1, ELLIPSIS, 48, 49, 50]),
|
|
(49, 0, 1, [1, ELLIPSIS, 49, 50]),
|
|
(50, 0, 1, [1, ELLIPSIS, 50]),
|
|
# on_each_side=0, on_ends=0
|
|
(1, 0, 0, [1, ELLIPSIS]),
|
|
(2, 0, 0, [1, 2, ELLIPSIS]),
|
|
(3, 0, 0, [ELLIPSIS, 3, ELLIPSIS]),
|
|
(48, 0, 0, [ELLIPSIS, 48, ELLIPSIS]),
|
|
(49, 0, 0, [ELLIPSIS, 49, 50]),
|
|
(50, 0, 0, [ELLIPSIS, 50]),
|
|
]
|
|
paginator = Paginator(range(5000), 100)
|
|
for number, on_each_side, on_ends, expected in tests:
|
|
with self.subTest(
|
|
number=number, on_each_side=on_each_side, on_ends=on_ends
|
|
):
|
|
page_range = paginator.get_elided_page_range(
|
|
number,
|
|
on_each_side=on_each_side,
|
|
on_ends=on_ends,
|
|
)
|
|
self.assertIsInstance(page_range, collections.abc.Generator)
|
|
self.assertEqual(list(page_range), expected)
|
|
|
|
|
|
class ModelPaginationTests(TestCase):
|
|
"""
|
|
Test pagination with Django model instances
|
|
"""
|
|
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
# Prepare a list of objects for pagination.
|
|
pub_date = datetime(2005, 7, 29)
|
|
cls.articles = [
|
|
Article.objects.create(headline=f"Article {x}", pub_date=pub_date)
|
|
for x in range(1, 10)
|
|
]
|
|
|
|
def test_first_page(self):
|
|
paginator = Paginator(Article.objects.order_by("id"), 5)
|
|
p = paginator.page(1)
|
|
self.assertEqual("<Page 1 of 2>", str(p))
|
|
self.assertSequenceEqual(p.object_list, self.articles[:5])
|
|
self.assertTrue(p.has_next())
|
|
self.assertFalse(p.has_previous())
|
|
self.assertTrue(p.has_other_pages())
|
|
self.assertEqual(2, p.next_page_number())
|
|
with 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.order_by("id"), 5)
|
|
p = paginator.page(2)
|
|
self.assertEqual("<Page 2 of 2>", str(p))
|
|
self.assertSequenceEqual(p.object_list, self.articles[5:])
|
|
self.assertFalse(p.has_next())
|
|
self.assertTrue(p.has_previous())
|
|
self.assertTrue(p.has_other_pages())
|
|
with 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 behavior of a paginator page __getitem__ (queryset
|
|
evaluation, slicing, exception raised).
|
|
"""
|
|
paginator = Paginator(Article.objects.order_by("id"), 5)
|
|
p = paginator.page(1)
|
|
|
|
# object_list queryset is not evaluated by an invalid __getitem__ call.
|
|
# (this happens from the template engine when using e.g.:
|
|
# {% page_obj.has_previous %}).
|
|
self.assertIsNone(p.object_list._result_cache)
|
|
msg = "Page indices must be integers or slices, not str."
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
p["has_previous"]
|
|
self.assertIsNone(p.object_list._result_cache)
|
|
self.assertNotIsInstance(p.object_list, list)
|
|
|
|
# Make sure slicing the Page object with numbers and slice objects work.
|
|
self.assertEqual(p[0], self.articles[0])
|
|
self.assertSequenceEqual(p[slice(2)], self.articles[:2])
|
|
# 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: <class 'pagination.models.Article'> QuerySet."
|
|
)
|
|
with self.assertWarnsMessage(UnorderedObjectListWarning, msg) as cm:
|
|
Paginator(Article.objects.all(), 5)
|
|
# The warning points at the Paginator caller (i.e. the stacklevel
|
|
# is appropriate).
|
|
self.assertEqual(cm.filename, __file__)
|
|
|
|
def test_paginating_empty_queryset_does_not_warn(self):
|
|
with warnings.catch_warnings(record=True) as recorded:
|
|
Paginator(Article.objects.none(), 5)
|
|
self.assertEqual(len(recorded), 0)
|
|
|
|
def test_paginating_unordered_object_list_raises_warning(self):
|
|
"""
|
|
Unordered object list warning with an object that has an ordered
|
|
attribute but not a model attribute.
|
|
"""
|
|
|
|
class ObjectList:
|
|
ordered = False
|
|
|
|
object_list = ObjectList()
|
|
msg = (
|
|
"Pagination may yield inconsistent results with an unordered "
|
|
"object_list: {!r}.".format(object_list)
|
|
)
|
|
with self.assertWarnsMessage(UnorderedObjectListWarning, msg):
|
|
Paginator(object_list, 5)
|