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from __future__ import absolute_import
from datetime import datetime
from django.core.paginator import Paginator, InvalidPage, EmptyPage
from django.test import TestCase
from .models import Article
class CountContainer(object):
def count(self):
return 42
class LenContainer(object):
def __len__(self):
return 42
class PaginationTests(TestCase):
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_paginator(self):
paginator = Paginator(Article.objects.all(), 5)
self.assertEqual(9, paginator.count)
self.assertEqual(2, paginator.num_pages)
self.assertEqual([1, 2], paginator.page_range)
def test_first_page(self):
paginator = Paginator(Article.objects.all(), 5)
p = paginator.page(1)
self.assertEqual(u"<Page 1 of 2>", unicode(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.assertEqual(0, 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(u"<Page 2 of 2>", unicode(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.assertEqual(3, 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_empty_page(self):
paginator = Paginator(Article.objects.all(), 5)
self.assertRaises(EmptyPage, paginator.page, 0)
self.assertRaises(EmptyPage, paginator.page, 3)
# Empty paginators with allow_empty_first_page=True.
paginator = Paginator(Article.objects.filter(id=0), 5, allow_empty_first_page=True)
self.assertEqual(0, paginator.count)
self.assertEqual(1, paginator.num_pages)
self.assertEqual([1], paginator.page_range)
# Empty paginators with allow_empty_first_page=False.
paginator = Paginator(Article.objects.filter(id=0), 5, allow_empty_first_page=False)
self.assertEqual(0, paginator.count)
self.assertEqual(0, paginator.num_pages)
self.assertEqual([], paginator.page_range)
def test_invalid_page(self):
paginator = Paginator(Article.objects.all(), 5)
self.assertRaises(InvalidPage, paginator.page, 7)
def test_orphans(self):
# Add a few more records to test out the orphans feature.
for x in range(10, 13):
Article(headline="Article %s" % x, pub_date=datetime(2006, 10, 6)).save()
# With orphans set to 3 and 10 items per page, we should get all 12 items on a single page.
paginator = Paginator(Article.objects.all(), 10, orphans=3)
self.assertEqual(1, paginator.num_pages)
# With orphans only set to 1, we should get two pages.
paginator = Paginator(Article.objects.all(), 10, orphans=1)
self.assertEqual(2, paginator.num_pages)
def test_paginate_list(self):
# Paginators work with regular lists/tuples, too -- not just with QuerySets.
paginator = Paginator([1, 2, 3, 4, 5, 6, 7, 8, 9], 5)
self.assertEqual(9, paginator.count)
self.assertEqual(2, paginator.num_pages)
self.assertEqual([1, 2], paginator.page_range)
p = paginator.page(1)
self.assertEqual(u"<Page 1 of 2>", unicode(p))
self.assertEqual([1, 2, 3, 4, 5], p.object_list)
self.assertTrue(p.has_next())
self.assertFalse(p.has_previous())
self.assertTrue(p.has_other_pages())
self.assertEqual(2, p.next_page_number())
self.assertEqual(0, p.previous_page_number())
self.assertEqual(1, p.start_index())
self.assertEqual(5, p.end_index())
def test_paginate_misc_classes(self):
# 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], paginator.page_range)
# Paginator can be passed other objects that implement __len__.
paginator = Paginator(LenContainer(), 10)
self.assertEqual(42, paginator.count)
self.assertEqual(5, paginator.num_pages)
self.assertEqual([1, 2, 3, 4, 5], paginator.page_range)
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