diff --git a/neutron/objects/base.py b/neutron/objects/base.py
index f377e12c77e..3fa5bc72612 100644
--- a/neutron/objects/base.py
+++ b/neutron/objects/base.py
@@ -213,7 +213,8 @@ class NeutronDbObject(NeutronObject):
         :param db_obj: dict of object fetched from database
         :return: modified dict of DB values
         """
-        result = dict(db_obj)
+        result = {field: value for field, value in dict(db_obj).items()
+                  if value is not None}
         for field, field_db in cls.fields_need_translation.items():
             if field_db in result:
                 result[field] = result.pop(field_db)
diff --git a/neutron/objects/db/api.py b/neutron/objects/db/api.py
index a8f57fc7888..670b285c083 100644
--- a/neutron/objects/db/api.py
+++ b/neutron/objects/db/api.py
@@ -37,7 +37,7 @@ def create_object(context, model, values):
             values['id'] = uuidutils.generate_uuid()
         db_obj = model(**values)
         context.session.add(db_obj)
-    return db_obj.__dict__
+    return db_obj
 
 
 def _safe_get_object(context, model, **kwargs):
@@ -55,7 +55,7 @@ def update_object(context, model, values, **kwargs):
         db_obj = _safe_get_object(context, model, **kwargs)
         db_obj.update(values)
         db_obj.save(session=context.session)
-    return db_obj.__dict__
+    return db_obj
 
 
 def delete_object(context, model, **kwargs):