Added a skip for a test that fails in Oracle. Unlike other backends, Oracle does not allow duplicate rows where there is a unique_together constraint for which some but not all of the columns are NULL.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15777 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/__init__.py

@@ -266,6 +266,10 @@ class BaseDatabaseFeatures(object):
     # Does the backend distinguish between '' and None?
     interprets_empty_strings_as_nulls = False
 
+    # Does the backend allow inserting duplicate rows when a unique_together
+    # constraint exists, but one of the unique_together columns is NULL?
+    ignores_nulls_in_unique_constraints = True
+
     can_use_chunked_reads = True
     can_return_id_from_insert = False
     uses_autocommit = False

django/db/backends/oracle/base.py

@@ -76,6 +76,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_timezones = False
     supports_bitwise_or = False
     can_defer_constraint_checks = True
+    ignores_nulls_in_unique_constraints = False
 
 class DatabaseOperations(BaseDatabaseOperations):
     compiler_module = "django.db.backends.oracle.compiler"

tests/modeltests/model_formsets/tests.py

@@ -7,7 +7,7 @@ from django import forms
 from django.db import models
 from django.forms.models import (_get_foreign_key, inlineformset_factory,
     modelformset_factory, modelformset_factory)
-from django.test import TestCase
+from django.test import TestCase, skipUnlessDBFeature
 
 from modeltests.model_formsets.models import (
     Author, BetterAuthor, Book, BookWithCustomPK, Editor,
@@ -577,10 +577,13 @@ class ModelFormsetTest(TestCase):
         self.assertEqual(book1.title, 'Flowers of Evil')
         self.assertEqual(book1.notes, 'English translation of Les Fleurs du Mal')
 
+    @skipUnlessDBFeature('ignores_nulls_in_unique_constraints')
+    def test_inline_formsets_with_nullable_unique_together(self):
         # Test inline formsets where the inline-edited object has a
         # unique_together constraint with a nullable member
 
         AuthorBooksFormSet4 = inlineformset_factory(Author, BookWithOptionalAltEditor, can_delete=False, extra=2)
+        author = Author.objects.create(pk=1, name='Charles Baudelaire')
 
         data = {
             'bookwithoptionalalteditor_set-TOTAL_FORMS': '2', # the number of forms rendered