Python pickle can’t pickle class instances where the class isn't locatable as module-level imports. As automap necessarily creates classes on the fly, these classes aren’t part of any module. to have them part of a module you’d want to use an event to place them in the namespace of one of your own modules, or you can implement a custom `__reduce__()` method on them (see the Python docs for __reduce__()).
a good event to use here might be instrument_class: http://docs.sqlalchemy.org/en/rel_0_9/orm/events.html#sqlalchemy.orm.events.MapperEvents.instrument_class On Feb 6, 2014, at 4:32 AM, Adrian Robert <adrian.b.rob...@gmail.com> wrote: > One other point, I was trying out the dogpile cache example and ran into > (after I stuck a ".encode('utf-8')" into the key mangler since I'm using > Python-3 and pylibmc): > > _pickle.PicklingError: Can't pickle <class 'sqlalchemy.ext.automap.Person'>: > attribute lookup sqlalchemy.ext.automap.Person failed > > This was fixed by a hack > > sqlalchemy.ext.automap.__dict__[cls.__name__] = cls > > run over all the automap-created classes. It might be I'm only having to do > this because I'm doing something wrong elsewhere, but I just thought I'd > mention it in case it comes up for someone. > > > > On 2014.2.2, at 14:22, Adrian Robert <adrian.b.rob...@gmail.com> wrote: > >> Thanks, that works beautifully. >> >> I had noticed name_for_scalar_relationship parameter but I guess wasn't >> confident enough that I understood what was going on to try it. :-[ >> >> >> -- >> 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/p6YkPuCs_Ks/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/groups/opt_out. > > -- > 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/groups/opt_out.
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