Hi, I have a question about some ORM internal state tracking stuff. If this isn't the right venue for this type of question my apologies.
I've run into what looks like a race condition using the ORM during some our production workloads. I am trying to figure out if our code has a bug or if we are hitting a bug inside the ORM. We are occasionally getting a FlushError with this message "Over 100 subsequent flushes have occurred within session.commit() - is an after_flush() hook creating new objects?"( we are not using any event hooks.) I've managed to track this down to what looks like the session.identity_map has an InstanceState in its modified list (i.e. the session is dirty) but the InstanceState is not in the sessions.identity_map._dict (i.e not in the session?). The InstanceState is showing that it is attached to the session. e.g. the WeakInstanceDict looks like this for the session... _dict = {} # is empty _modified = ( TheModifiedInstanceState ) This is a difficult bug to reproduce, but seems more likely to occur if we hold the session open longer like so... my_model = MyModel.query.filter('...').first() my_model.attr = 'something' sleep(1) session.commit() <-- flush error "occasionally" I was hoping someone could confirm for me that this is "never a valid state" for the identity map to be in. (Or if I'm super lucky someone will recognize this as a known bug or something). Thanks for the help, Cecil -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.