I'm running web service using sqlalchemy with apache + wsgi + pyramid framework. I've initialize metadata like the following:
Base = declarative_base() Base.metadata.reflect(bind=my_engine) user_table = DP_Base.metadata.tables["user"] mapper(User, user_table) and I'm using scoped session since I'm running apache+wsgi with multiple processes and threads. weird thing is that, errors occur sometimes saying ArgumentError: Class '<class 'mypackage.User'>' already has a primary mapper defined. Use non_primary=True to create a non primary Mapper. clear_mappers() will remove *all* current mappers from all classes. Once the error occurs, all the following requests to the web service encounter the same errors. Restarting httpd seems to resolve the problem temporarily. I'm afraid that I'm using reflection and mapping in the wrong way? or Is there something that I have to care about among multi-threaded, scoped session, and table mapping? -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/TuEWdqXlg6EJ. 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.
