Thanks a lot! This works well. Tom
On Thu, 16 Jul 2015 at 21:23 Mike Bayer <mike...@zzzcomputing.com> wrote: > > > On 7/16/15 2:28 PM, Tom Flannaghan wrote: > > Thanks for your reply. Our exact problem is that we are creating empty > detached objects from the primary key alone, and then merging them in to a > session, so we can't do this: > > On Thursday, 16 July 2015 18:44:26 UTC+1, Michael Bayer wrote: >> >> >> For now, I'd recommend either not using expire() or specifying specific >> attribute names to expire(). >> >> > I just included the expire() in the example as it was a more succinct > way to reproduce the same bug. > Our code looks more like this: > > detached_port = Port(name='test') > make_transient_to_detached(detached_port) > new_port = session.merge(detached_port, load=False) > ... > > In my example, Port only has two columns so this won't demonstrate the > bug as the only non-deferred column is filled in already, but more > complicated objects that are merged in this way will not defer columns. Do > you think there a work around in this case? > > try this recipe which should reset the expired state of the target > attributes individually: > > > from sqlalchemy.orm import attributes > > > def merge_load_false(session, obj): > obj = session.merge(obj, load=False) > > obj_state = attributes.instance_state(obj) > obj_dict = obj_state.dict > > deferred_keys = [ > attr.key for attr in obj_state.mapper.column_attrs if > attr.deferred] > for k in deferred_keys: > if k not in obj_dict: > obj_state._reset(obj_dict, k) > return obj > > a1 = merge_load_false(s, a1) > > > > > > > Thanks, > Tom > -- > > 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 http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "sqlalchemy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sqlalchemy/gRV7mSHFJiE/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > -- 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 http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
