Thank you Mike, So basically, I should move the cleanup from `after_commit`/`after_rollback` to `after_transaction_end` and do it **only** if `transaction.parent is None`?
Recap'ing the solution (Jason's and yours combined): 1- On `after_flush`, call `history_meta.create_version()` for each object that is changing so its `XYZHistory` instance is created and can be stored within `session.info`. 2. On `before_commit`, do `session.add()` for each history instance (`XYZHistory`) in `session.info` and increase `version` of each object associated to each history instance. 3. On `after_transaction_end`, if `transaction.parent` is `None`, clean up `session.info`. True? And, even if there was a `session rollback` and/or `soft rollback`, the `session.info` would have been cleaned up by step 3. True? -- 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.
