- lazy loads for relationship attributes now use

the current state, not the "committed" state,
of foreign and primary key attributes
when issuing SQL, if a flush is not in process.
Previously, only the database-committed state would
be used.  In particular, this would cause a many-to-one
get()-on-lazyload operation to fail, as autoflush
is not triggered on these loads when the attributes are
determined and the "committed" state may not be
available.  [ticket:1910]

- A new flag on relationship(), load_on_pending, allows
the lazy loader to fire off on pending objects without a
flush taking place, as well as a transient object that's
been manually "attached" to the session. Note that this
flag blocks attribute events from taking place when an
object is loaded, so backrefs aren't available until
after a flush. The flag is only intended for very
specific use cases.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/collections.py b/lib/sqlalchemy/orm/collections.py
index b80be970a..0789d9626 100644
--- a/lib/sqlalchemy/orm/collections.py
+++ b/lib/sqlalchemy/orm/collections.py
@@ -546,6 +546,7 @@ class CollectionAdapter(object):
 
     def append_with_event(self, item, initiator=None):
         """Add an entity to the collection, firing mutation events."""
+        
         getattr(self._data(), '_sa_appender')(item, _sa_initiator=initiator)
 
     def append_without_event(self, item):