Greetings SA community! I've got mapped objects being created and added to a session, but not committed. Once in a while, I'd like to do something a-la:
oid = 42 object = MyClass(oid) sessionA.add(object) # ... time passes, things happen ... then object = get_obj_from_session(oid, sessionA) sessionA.expunge(object) sessionB = gimme_a_new_session() sessionB.add(object) sessionB.commit() sessionB.close() This fails to actually save the object to the db: nothing is inserted as SA seems to think the object is an up to date reflection of some (non-existent) row in the db. The problem, I think, is the InstanceState associated with this object from its initial residence in sessionA. This state has lotsa stuff in it, including a 'key' attribute that looks something like: (model.MyClass, 42) I've read elsewhere that the "solution" is do delete the instance state 'key', but this only hangs my program with no indication as to why. In any case, this seems like a solution that involves way to much knowledge of the internals for my taste. I've tried a number of things, everything from trying to merge() into the new session, deleting the entire instance state from the object, deleting + expunging from sessionA and other random things, to no avail. Doing a deep copy of the expunged object might be possible, to then add that to the new session, but would involve a lot of work for something that seems like it should be straightforward with SQLAlchemy... My questions are: - why does the instance state think it doesn't need to insert this object, that was never committed? - SA seems to be acting as if the object is in a "Detached" state after the expunge, even though it was never committed and does not exist in the db. Why and can I somehow force this to "Transient" before the sessionB.add() or "Pending", after? - why doesn't expunge remove all references to the original session/ state -- is there a way to do this? - maybe I'm going about this completely wrong... any other method I should be using? Thanks in advance and regards, Pat Deegan --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
