[sqlalchemy] Re: Object is already attached to session
On Thu, Jun 12, 2008 at 4:58 PM, bollwyvl [EMAIL PROTECTED] wrote: I am running into similar problems, adding to the complexity the threadpool module. Here's a post that might help: http://blog.uxpython.com/blog/web/view/116 I am still running into problems, however, based on parent/child relationships... i think the answer lies in the sqlalchemy `cascade` property, but I as yet have not found a way to modify that directly in the Elixir layer. I'm not sure the cascade property is the answer to Matt's problem but in any case, you can use the cascade argument on Elixir relationships exactly as you do with SQLAlchemy's relation(). In fact any argument not specifically used by Elixir's relationships is forwarded to the relation() construct. -- Gaëtan de Menten http://openhex.org --~--~-~--~~~---~--~~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Object is already attached to session
On Apr 16, 2008, at 3:55 PM, mg wrote: I have a couple of threads that are working on the same objects, passing them back and forth in queues. I have just started testing with the Sqlalchemy parts turned on, and I am getting the already attached to session message. Also of note is that I am using the Elixir declarative layer, although I don't think that is causing the problem. Here is a basic example of what I am doing. queue = Queue() class History(Entity): status_id = Field(Integer) text = Field(Text) using_options(tablename='history', autosetup=True) using_table_options(useexisting=True) class Worker(threading.Thread): def run(self): items = History.query.all() for item in item: queue.put(item) for i in range(pool_size): consumer = Consumer(self.getName()) consumer.start() class Consumer(threading.Thread): def run(self): item = queue.get_nowait() if True: item.status_id = 1 else: item.status_id = 2 item.update() item.flush() when I try to update I get: InvalidRequestError: Object '[EMAIL PROTECTED]' is already attached to session '21222960' (this is '21223440') any help would be greatly appreciated. if you're passing objects between threads with corresponding contextual sessions, you need to be expunging those objects from the session in which they're present before using them in another session. Use Session.expunge() for this. --~--~-~--~~~---~--~~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
