Hi All,
I have a query previously written with the old "select" approach that
used a join:
sua = SurveyUserActivity
all_users = SurveyUser
user_view = select([all_users.c.id,
all_users.c.user_name,
all_users.c.user_email]
).alias('user_view')
recent_users = select([sua.c.user_id, func.max(
sua.c.last_updated).label('last_used')],
group_by=[sua.c.user_id]).alias('recent_users')
users = join(user_view, recent_users,
user_view.c.id==recent_users.c.user_id <--- Error
here
).select().execute().fetchall()
that I need to rewrite using sessions - we're using z3c.alchemy within
a zope3 application, where the session is just retrieved using:
session = z3c.zalchemy.getSession()
The tables are defined as, e.g.,
class ISurveyUser(ISQLAlchemyObject):
id = zope.schema.Int(
title=_(u'User ID'),
description=_(u"What is the ID of the user?"))
...
class SurveyUser(object):
"""User object mapped to user table"""
zope.interface.implements(interfaces.ISurveyUser)
...
When I run the above code, I get an error at the point indicated
above:
File ".../SQLAlchemy-0.4.2p3-py2.4.egg/sqlalchemy/sql/
expression.py", line 991, in execute
InvalidRequestError: This Compiled object is not bound to any Engine
or Connection.
Whichever way I can get this to work would be great. Thanks in advance
for any help.
Cheers, Andrew.
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