On Tue, 2012-01-31 at 12:52 +0100, Torsten Landschoff wrote: > However, with SQLAlchemy 0.7.5 I get > > $ python new_instance.py > Traceback (most recent call last): > File "new_instance.py", line 27, in <module> > session.commit() > [...] > File > "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.5dev-py2.6-linux-x86_64.egg/sqlalchemy/engine/default.py", > line 330, in do_execute > cursor.execute(statement, parameters) > sqlalchemy.exc.IntegrityError: (IntegrityError) people.type may not be NULL > u'INSERT INTO people (type) VALUES (?)' (None,)
I found a workaround: --- a/new_instance.py 2012-01-31 12:50:44.510525675 +0100 +++ b/new_instance.py 2012-01-31 13:05:52.110514861 +0100 @@ -1,6 +1,6 @@ from sqlalchemy import * from sqlalchemy.orm import * -from sqlalchemy.orm.attributes import manager_of_class +from sqlalchemy.orm.attributes import manager_of_class, instance_state from sqlalchemy.ext.declarative import declarative_base @@ -22,7 +22,11 @@ Base.metadata.create_all(engine) session = sessionmaker(engine)() -e = manager_of_class(Engineer).new_instance() +manager = manager_of_class(Engineer) +e = manager.new_instance() +state = instance_state(e) +manager.mapper._set_polymorphic_identity(state) + session.add(e) session.commit() But this is leaving the area of documented API. I found out that SQLAlchemy actually initializes the polymorphic_identity column by registering an on_init event. I'd rather trigger that but I did not yet find out how to do that. Thanks, Torsten -- DYNAmore Gesellschaft fuer Ingenieurdienstleistungen mbH Torsten Landschoff Office Dresden Tel: +49-(0)351-4519587 Fax: +49-(0)351-4519561 mailto:torsten.landsch...@dynamore.de http://www.dynamore.de Registration court: Stuttgart, HRB 733694 Managing director: Prof. Dr. Karl Schweizerhof, Dipl.-Math. Ulrich Franz -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
