In a pyramid application:
In models.py: DBSession= 
scoped_session(sessionmaker(extensions=ZopeTransactionExtension()))
 In view:   dbsession = DBSession
               def add(request):
    #get implant1
               dbsession.add(implant)
               transaction.commit()
             dbsession = DBsession
This works fine on first add. On second call to add, the first implant 
object is updated rather than an object added as I would expect from the 
sqlalchemy session docs .  Using a new session after the commit is 
suggested in the zope-sqlalchemy docs to achieve this. The user in this 
application might do repeated adds into many tables  in one request .
So because I  want to use more than one session per request, I should not 
use Zope-SQLAlchemy extension but SQLAlchemy  ScopedSession helper class. 
Is that correct? Please excuse any misuse of terminology. Thanks for 
pointing me in the right direction.
Using SQLAlchemy0.7.3
zope-sqlalchemy0.6.1

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