Removes created_at, updated_at from ModelBase

Created a 'TimestampMixin' class.
Next step is to update Nova which is the only project using oslo.db

Fixes bug #1119702

Change-Id: I1ffcc09a2971e6e6102da7ecb855a2837a159baf

1 files changed, 5 insertions, 2 deletions

diff --git a/openstack/common/db/sqlalchemy/models.py b/openstack/common/db/sqlalchemy/models.py
index f674da2..e019eed 100644
--- a/openstack/common/db/sqlalchemy/models.py
+++ b/openstack/common/db/sqlalchemy/models.py
@@ -33,8 +33,6 @@ from openstack.common import timeutils
 class ModelBase(object):
     """Base class for models."""
     __table_initialized__ = False
-    created_at = Column(DateTime, default=timeutils.utcnow)
-    updated_at = Column(DateTime, onupdate=timeutils.utcnow)
     metadata = None
 
     def save(self, session=None):
@@ -92,6 +90,11 @@ class ModelBase(object):
         return local.iteritems()
 
 
+class TimestampMixin(object):
+    created_at = Column(DateTime, default=timeutils.utcnow)
+    updated_at = Column(DateTime, onupdate=timeutils.utcnow)
+
+
 class SoftDeleteMixin(object):
     deleted_at = Column(DateTime)
     deleted = Column(Integer, default=0)