Fixed #24201 -- Added order_with_respect_to support to GenericForeignKey.

tests/order_with_respect_to/models.py

@@ -1,5 +1,9 @@
 """
 Tests for the order_with_respect_to Meta attribute.
+
+We explicitly declare app_label on these models, because they are reused by
+contenttypes_tests. When those tests are run in isolation, these models need
+app_label because order_with_respect_to isn't in INSTALLED_APPS.
 """
 
 from django.db import models
@@ -10,6 +14,9 @@ from django.utils.encoding import python_2_unicode_compatible
 class Question(models.Model):
     text = models.CharField(max_length=200)
 
+    class Meta:
+        app_label = 'order_with_respect_to'
+
 
 @python_2_unicode_compatible
 class Answer(models.Model):
@@ -18,6 +25,7 @@ class Answer(models.Model):
 
     class Meta:
         order_with_respect_to = 'question'
+        app_label = 'order_with_respect_to'
 
     def __str__(self):
         return six.text_type(self.text)
@@ -30,6 +38,7 @@ class Post(models.Model):
 
     class Meta:
         order_with_respect_to = "parent"
+        app_label = 'order_with_respect_to'
 
     def __str__(self):
         return self.title

tests/order_with_respect_to/tests.py

@@ -10,13 +10,17 @@ from .models import Answer, Post, Question
 
 class OrderWithRespectToTests(TestCase):
 
+    # Hook to allow subclasses to run these tests with alternate models.
+    Answer = Answer
+    Question = Question
+
     @classmethod
     def setUpTestData(cls):
-        cls.q1 = Question.objects.create(text="Which Beatle starts with the letter 'R'?")
-        Answer.objects.create(text="John", question=cls.q1)
-        Answer.objects.create(text="Paul", question=cls.q1)
-        Answer.objects.create(text="George", question=cls.q1)
-        Answer.objects.create(text="Ringo", question=cls.q1)
+        cls.q1 = cls.Question.objects.create(text="Which Beatle starts with the letter 'R'?")
+        cls.Answer.objects.create(text="John", question=cls.q1)
+        cls.Answer.objects.create(text="Paul", question=cls.q1)
+        cls.Answer.objects.create(text="George", question=cls.q1)
+        cls.Answer.objects.create(text="Ringo", question=cls.q1)
 
     def test_default_to_insertion_order(self):
         # Answers will always be ordered in the order they were inserted.
@@ -30,30 +34,30 @@ class OrderWithRespectToTests(TestCase):
     def test_previous_and_next_in_order(self):
         # We can retrieve the answers related to a particular object, in the
         # order they were created, once we have a particular object.
-        a1 = Answer.objects.filter(question=self.q1)[0]
+        a1 = self.q1.answer_set.all()[0]
         self.assertEqual(a1.text, "John")
         self.assertEqual(a1.get_next_in_order().text, "Paul")
 
-        a2 = list(Answer.objects.filter(question=self.q1))[-1]
+        a2 = list(self.q1.answer_set.all())[-1]
         self.assertEqual(a2.text, "Ringo")
         self.assertEqual(a2.get_previous_in_order().text, "George")
 
     def test_item_ordering(self):
         # We can retrieve the ordering of the queryset from a particular item.
-        a1 = Answer.objects.filter(question=self.q1)[1]
+        a1 = self.q1.answer_set.all()[1]
         id_list = [o.pk for o in self.q1.answer_set.all()]
-        self.assertEqual(a1.question.get_answer_order(), id_list)
+        self.assertSequenceEqual(a1.question.get_answer_order(), id_list)
 
         # It doesn't matter which answer we use to check the order, it will
         # always be the same.
-        a2 = Answer.objects.create(text="Number five", question=self.q1)
-        self.assertEqual(
-            a1.question.get_answer_order(), a2.question.get_answer_order()
+        a2 = self.Answer.objects.create(text="Number five", question=self.q1)
+        self.assertListEqual(
+            list(a1.question.get_answer_order()), list(a2.question.get_answer_order())
         )
 
     def test_change_ordering(self):
         # The ordering can be altered
-        a = Answer.objects.create(text="Number five", question=self.q1)
+        a = self.Answer.objects.create(text="Number five", question=self.q1)
 
         # Swap the last two items in the order list
         id_list = [o.pk for o in self.q1.answer_set.all()]
@@ -61,7 +65,7 @@ class OrderWithRespectToTests(TestCase):
         id_list.insert(-1, x)
 
         # By default, the ordering is different from the swapped version
-        self.assertNotEqual(a.question.get_answer_order(), id_list)
+        self.assertNotEqual(list(a.question.get_answer_order()), id_list)
 
         # Change the ordering to the swapped version -
         # this changes the ordering of the queryset.
@@ -76,19 +80,25 @@ class OrderWithRespectToTests(TestCase):
 
 class OrderWithRespectToTests2(TestCase):
 
+    # Provide the Post model as a class attribute so that we can subclass this
+    # test case in contenttypes_tests.test_order_with_respect_to and run these
+    # tests with alternative implementations of Post.
+    Post = Post
+
     def test_recursive_ordering(self):
-        p1 = Post.objects.create(title='1')
-        p2 = Post.objects.create(title='2')
-        p1_1 = Post.objects.create(title="1.1", parent=p1)
-        p1_2 = Post.objects.create(title="1.2", parent=p1)
-        Post.objects.create(title="2.1", parent=p2)
-        p1_3 = Post.objects.create(title="1.3", parent=p1)
-        self.assertEqual(p1.get_post_order(), [p1_1.pk, p1_2.pk, p1_3.pk])
+        p1 = self.Post.objects.create(title="1")
+        p2 = self.Post.objects.create(title="2")
+        p1_1 = self.Post.objects.create(title="1.1", parent=p1)
+        p1_2 = self.Post.objects.create(title="1.2", parent=p1)
+        self.Post.objects.create(title="2.1", parent=p2)
+        p1_3 = self.Post.objects.create(title="1.3", parent=p1)
+        self.assertSequenceEqual(p1.get_post_order(), [p1_1.pk, p1_2.pk, p1_3.pk])
 
     def test_duplicate_order_field(self):
 
         class Bar(models.Model):
-            pass
+            class Meta:
+                app_label = 'order_with_respect_to'
 
         class Foo(models.Model):
             bar = models.ForeignKey(Bar, models.CASCADE)
@@ -96,6 +106,7 @@ class OrderWithRespectToTests2(TestCase):
 
             class Meta:
                 order_with_respect_to = 'bar'
+                app_label = 'order_with_respect_to'
 
         count = 0
         for field in Foo._meta.local_fields: