A performance fix related to the usage of the :func:`.defer` option

when loading mapped entities.   The function overhead of applying
a per-object deferred callable to an instance at load time was
significantly higher than that of just loading the data from the row
(note that ``defer()`` is meant to reduce DB/network overhead, not
necessarily function call count); the function call overhead is now
less than that of loading data from the column in all cases.  There
is also a reduction in the number of "lazy callable" objects created
per load from N (total deferred values in the result) to 1 (total
number of deferred cols).
[ticket:2778]

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/loading.py b/lib/sqlalchemy/orm/loading.py
index 5937197fd..1006d45c1 100644
--- a/lib/sqlalchemy/orm/loading.py
+++ b/lib/sqlalchemy/orm/loading.py
@@ -161,7 +161,7 @@ def get_from_identity(session, key, passive):
                 # expired state will be checked soon enough, if necessary
                 return instance
             try:
-                state(passive)
+                state(state, passive)
             except orm_exc.ObjectDeletedError:
                 session._remove_newly_deleted([state])
                 return None