more ordering unit tests

tests/test_queryset.py

@@ -952,6 +952,11 @@ class QuerySetTest(unittest.TestCase):
                              {'attachments.views.extracted': 'no'}]}
         self.assertEqual(expected, raw_query)
 
+    def assertSequence(self, qs, expected):
+        self.assertEqual(len(qs), len(expected))
+        for i in range(len(qs)):
+            self.assertEqual(qs[i], expected[i])
+
     def test_ordering(self):
         """Ensure default ordering is applied and can be overridden.
         """
@@ -965,10 +970,10 @@ class QuerySetTest(unittest.TestCase):
 
         BlogPost.drop_collection()
 
-        blog_post_1 = BlogPost(title="Blog Post #1",
-                               published_date=datetime(2010, 1, 5, 0, 0 ,0))
         blog_post_2 = BlogPost(title="Blog Post #2",
                                published_date=datetime(2010, 1, 6, 0, 0 ,0))
+        blog_post_1 = BlogPost(title="Blog Post #1",
+                               published_date=datetime(2010, 1, 5, 0, 0 ,0))
         blog_post_3 = BlogPost(title="Blog Post #3",
                                published_date=datetime(2010, 1, 7, 0, 0 ,0))
 
@@ -978,14 +983,13 @@ class QuerySetTest(unittest.TestCase):
 
         # get the "first" BlogPost using default ordering
         # from BlogPost.meta.ordering
-        latest_post = BlogPost.objects.first()
-        self.assertEqual(latest_post.title, "Blog Post #3")
+        expected = [blog_post_3, blog_post_2, blog_post_1]
+        self.assertSequence(BlogPost.objects.all(), expected)
 
         # override default ordering, order BlogPosts by "published_date"
-        first_post = BlogPost.objects.order_by("+published_date").first()
-        self.assertEqual(first_post.title, "Blog Post #1")
-
-        BlogPost.drop_collection()
+        qs = BlogPost.objects.order_by("+published_date")
+        expected = [blog_post_1, blog_post_2, blog_post_3]
+        self.assertSequence(qs, expected)
 
     def test_only(self):
         """Ensure that QuerySet.only only returns the requested fields.
@@ -1921,8 +1925,8 @@ class QuerySetTest(unittest.TestCase):
     def test_order_by(self):
         """Ensure that QuerySets may be ordered.
         """
-        self.Person(name="User A", age=20).save()
         self.Person(name="User B", age=40).save()
+        self.Person(name="User A", age=20).save()
         self.Person(name="User C", age=30).save()
 
         names = [p.name for p in self.Person.objects.order_by('-age')]
@@ -1937,11 +1941,67 @@ class QuerySetTest(unittest.TestCase):
         ages = [p.age for p in self.Person.objects.order_by('-name')]
         self.assertEqual(ages, [30, 40, 20])
 
+    def test_order_by_optional(self):
+        class BlogPost(Document):
+            title = StringField()
+            published_date = DateTimeField(required=False)
+
+        BlogPost.drop_collection()
+
+        blog_post_3 = BlogPost(title="Blog Post #3",
+                               published_date=datetime(2010, 1, 6, 0, 0 ,0))
+        blog_post_2 = BlogPost(title="Blog Post #2",
+                               published_date=datetime(2010, 1, 5, 0, 0 ,0))
+        blog_post_4 = BlogPost(title="Blog Post #4",
+                               published_date=datetime(2010, 1, 7, 0, 0 ,0))
+        blog_post_1 = BlogPost(title="Blog Post #1", published_date=None)
+
+        blog_post_3.save()
+        blog_post_1.save()
+        blog_post_4.save()
+        blog_post_2.save()
+
+        expected = [blog_post_1, blog_post_2, blog_post_3, blog_post_4]
+        self.assertSequence(BlogPost.objects.order_by('published_date'),
+                            expected)
+        self.assertSequence(BlogPost.objects.order_by('+published_date'),
+                            expected)
+
+        expected.reverse()
+        self.assertSequence(BlogPost.objects.order_by('-published_date'),
+                            expected)
+
+    def test_order_by_list(self):
+        class BlogPost(Document):
+            title = StringField()
+            published_date = DateTimeField(required=False)
+
+        BlogPost.drop_collection()
+
+        blog_post_1 = BlogPost(title="A",
+                               published_date=datetime(2010, 1, 6, 0, 0 ,0))
+        blog_post_2 = BlogPost(title="B",
+                               published_date=datetime(2010, 1, 6, 0, 0 ,0))
+        blog_post_3 = BlogPost(title="C",
+                               published_date=datetime(2010, 1, 7, 0, 0 ,0))
+
+        blog_post_2.save()
+        blog_post_3.save()
+        blog_post_1.save()
+
+        qs = BlogPost.objects.order_by('published_date', 'title')
+        expected = [blog_post_1, blog_post_2, blog_post_3]
+        self.assertSequence(qs, expected)
+
+        qs = BlogPost.objects.order_by('-published_date', '-title')
+        expected.reverse()
+        self.assertSequence(qs, expected)
+
     def test_order_by_chaining(self):
         """Ensure that an order_by query chains properly and allows .only()
         """
-        self.Person(name="User A", age=20).save()
         self.Person(name="User B", age=40).save()
+        self.Person(name="User A", age=20).save()
         self.Person(name="User C", age=30).save()
 
         only_age = self.Person.objects.order_by('-age').only('age')
@@ -1953,6 +2013,17 @@ class QuerySetTest(unittest.TestCase):
         self.assertEqual(names, [None, None, None])
         self.assertEqual(ages, [40, 30, 20])
 
+        qs = self.Person.objects.all().limit(10)
+        qs = qs.order_by('-age')
+        ages = [p.age for p in qs]
+        self.assertEqual(ages, [40, 30, 20])
+
+        qs = self.Person.objects.all().skip(0)
+        qs = qs.order_by('-age')
+        ages = [p.age for p in qs]
+        self.assertEqual(ages, [40, 30, 20])
+
+
     def test_confirm_order_by_reference_wont_work(self):
         """Ordering by reference is not possible.  Use map / reduce.. or
         denormalise"""