3 files changed, 149 insertions, 0 deletions
diff --git a/parts/django/tests/modeltests/pagination/__init__.py b/parts/django/tests/modeltests/pagination/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/parts/django/tests/modeltests/pagination/__init__.py
diff --git a/parts/django/tests/modeltests/pagination/models.py b/parts/django/tests/modeltests/pagination/models.py
new file mode 100644
index 0000000..48484dd
--- /dev/null
+++ b/parts/django/tests/modeltests/pagination/models.py
@@ -0,0 +1,17 @@
+"""
+30. Object pagination
+
+Django provides a framework for paginating a list of objects in a few lines
+of code. This is often useful for dividing search results or long lists of
+objects into easily readable pages.
+"""
+
+from django.db import models
+
+
+class Article(models.Model):
+    headline = models.CharField(max_length=100, default='Default headline')
+    pub_date = models.DateTimeField()
+
+    def __unicode__(self):
+        return self.headline
diff --git a/parts/django/tests/modeltests/pagination/tests.py b/parts/django/tests/modeltests/pagination/tests.py
new file mode 100644
index 0000000..eaee466
--- /dev/null
+++ b/parts/django/tests/modeltests/pagination/tests.py
@@ -0,0 +1,132 @@
+from datetime import datetime
+from operator import attrgetter
+
+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)