From b412615bd99000e143d90e74b6dcae4d6b638f55 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sun, 14 Aug 2011 11:18:08 -0400
Subject: [PATCH]   - Fixed regression in new composite rewrite where    
 deferred=True option failed due to missing     import [ticket:2253]

---
 CHANGES                                |  4 ++++
 lib/sqlalchemy/orm/descriptor_props.py |  2 +-
 test/orm/test_composites.py            | 14 +++++++++++++-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index 485774dc27..5b504772d8 100644
--- a/CHANGES
+++ b/CHANGES
@@ -15,6 +15,10 @@ CHANGES
      when the Session.is_active is True.
      [ticket:2241]
 
+  - Fixed regression in new composite rewrite where
+    deferred=True option failed due to missing
+    import [ticket:2253]
+
   - Fixed bug in query.join() which would occur
     in a complex multiple-overlapping path scenario,
     where the same table could be joined to
diff --git a/lib/sqlalchemy/orm/descriptor_props.py b/lib/sqlalchemy/orm/descriptor_props.py
index 311993c0d7..f43952279a 100644
--- a/lib/sqlalchemy/orm/descriptor_props.py
+++ b/lib/sqlalchemy/orm/descriptor_props.py
@@ -13,7 +13,7 @@ as actively in the load/persist ORM loop.
 from sqlalchemy.orm.interfaces import \
     MapperProperty, PropComparator, StrategizedProperty
 from sqlalchemy.orm.mapper import _none_set
-from sqlalchemy.orm import attributes
+from sqlalchemy.orm import attributes, strategies
 from sqlalchemy import util, sql, exc as sa_exc, event, schema
 from sqlalchemy.sql import expression
 properties = util.importlater('sqlalchemy.orm', 'properties')
diff --git a/test/orm/test_composites.py b/test/orm/test_composites.py
index c336f40803..0d3cc20d63 100644
--- a/test/orm/test_composites.py
+++ b/test/orm/test_composites.py
@@ -621,4 +621,16 @@ class ConfigurationTest(fixtures.MappedTest):
         m.add_property('start', sa.orm.composite(Point, 'x1', 'y1'))
         m.add_property('end', sa.orm.composite(Point, 'x2', 'y2'))
 
-        self._test_roundtrip()
\ No newline at end of file
+        self._test_roundtrip()
+
+    def test_deferred(self):
+        edge, Edge, Point = (self.tables.edge,
+                                self.classes.Edge,
+                                self.classes.Point)
+        mapper(Edge, edge, properties={
+            'start':sa.orm.composite(Point, edge.c.x1, edge.c.y1, 
+                                            deferred=True, group='s'),
+            'end': sa.orm.composite(Point, edge.c.x2, edge.c.y2, 
+                                            deferred=True)
+        })
+        self._test_roundtrip()
-- 
2.47.3