[sqlalchemy] Polymorphic write - 'InstanceState' object has no attribute 'manager'

Hi, This trace is from some code that is loading a lot of objects (and which usually does so with no problems). I don't have more details yet (it will be quite some work to find out exactly what data is causing the error), but it does use joined table inheritance. Does anyone have any idea

Re: [sqlalchemy] Polymorphic write - 'InstanceState' object has no attribute 'manager'

this looks like some kind of serialization issue. are you deserializing instances before mappers have been compiled ?if you upgrade to 0.6, this will raise an error immediately at the point at which it occurs. On May 7, 2010, at 9:49 AM, andrew cooke wrote: Hi, This trace is from