- added an assertion within the "cascade" step of ORM relationships to check

that the class of object attached to a parent object is appropriate
(i.e. if A.items stores B objects, raise an error if a C is appended to A.items)
- new extension sqlalchemy.ext.associationproxy, provides transparent "association object"
mappings.  new example examples/association/proxied_association.py illustrates.
- some example cleanup

1 files changed, 4 insertions, 5 deletions

diff --git a/examples/vertical/vertical.py b/examples/vertical/vertical.py
index 4f0f5a15c..a6ee17428 100644
--- a/examples/vertical/vertical.py
+++ b/examples/vertical/vertical.py
@@ -1,11 +1,10 @@
-from sqlalchemy import *
-import datetime
-import sys
-
 """this example illustrates a "vertical table".  an object is stored with individual attributes 
 represented in distinct database rows.  This allows objects to be created with dynamically changing
 fields that are all persisted in a normalized fashion."""
-            
+
+from sqlalchemy import *
+import datetime
+
 e = BoundMetaData('sqlite://', echo=True)
 
 # this table represents Entity objects.  each Entity gets a row in this table,