Fixed #470 -- Added support for database defaults on fields.

Special thanks to Hannes Ljungberg for finding multiple implementation
gaps.

Thanks also to Simon Charette, Adam Johnson, and Mariusz Felisiak for
reviews.

2 files changed, 10 insertions, 0 deletions

diff --git a/tests/basic/models.py b/tests/basic/models.py
index 59a6a8d67f..b71b60a213 100644
--- a/tests/basic/models.py
+++ b/tests/basic/models.py
@@ -49,5 +49,9 @@ class PrimaryKeyWithDefault(models.Model):
     uuid = models.UUIDField(primary_key=True, default=uuid.uuid4)
 
 
+class PrimaryKeyWithDbDefault(models.Model):
+    uuid = models.IntegerField(primary_key=True, db_default=1)
+
+
 class ChildPrimaryKeyWithDefault(PrimaryKeyWithDefault):
     pass
diff --git a/tests/basic/tests.py b/tests/basic/tests.py
index ea9228376c..3c2d1dead9 100644
--- a/tests/basic/tests.py
+++ b/tests/basic/tests.py
@@ -20,6 +20,7 @@ from .models import (
     ArticleSelectOnSave,
     ChildPrimaryKeyWithDefault,
     FeaturedArticle,
+    PrimaryKeyWithDbDefault,
     PrimaryKeyWithDefault,
     SelfRef,
 )
@@ -175,6 +176,11 @@ class ModelInstanceCreationTests(TestCase):
         with self.assertNumQueries(1):
             PrimaryKeyWithDefault().save()
 
+    def test_save_primary_with_db_default(self):
+        # An UPDATE attempt is skipped when a primary key has db_default.
+        with self.assertNumQueries(1):
+            PrimaryKeyWithDbDefault().save()
+
     def test_save_parent_primary_with_default(self):
         # An UPDATE attempt is skipped when an inherited primary key has
         # default.