From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Mon, 10 Dec 2007 18:42:39 +0000 (+0000)
Subject: comment
X-Git-Tag: rel_0_4_2~70
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c468a274442d8d8dbf0ec2cd1182143278033500;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

comment
---

diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py
index 9515ba77fb..bbbdce6984 100644
--- a/lib/sqlalchemy/orm/query.py
+++ b/lib/sqlalchemy/orm/query.py
@@ -790,6 +790,9 @@ class Query(object):
         for instance in context.identity_map.values():
             context.attributes.get(('populating_mapper', id(instance)), object_mapper(instance))._post_instance(context, instance)
 
+        # "refresh_instance" may be loaded from a row which has no primary key columns to identify it.
+        # this occurs during the load of the "joined" table in a joined-table inheritance mapper, and saves
+        # the need to join to the primary table in those cases.
         if context.refresh_instance and context.only_load_props and context.refresh_instance.dict['_instance_key'] in context.identity_map:
             # if refreshing partial instance, do special state commit
             # affecting only the refreshed attributes