I'm trying to create a dynamic many_to_many relationship, inspired by: http://techspot.zzzeek.org/2011/05/17/magic-a-new-orm/ https://bitbucket.org/zzzeek/pycon2014_atmcraft/src/f50cbe745a19/atmcraft/model/meta/?at=master (orm.py and schema.py)
I've got it working with just creating a secondary table in the __declare_first__ hook. Now I want it to be a "secondary" class and not just a table - and I'm having trouble. I've created a declared class in the __declare_first__ hook. Creating that class causes (Full stacktrace at the bottom): RuntimeError: deque mutated during iteration I suppose new events are being added when I do so. Searching google I came upon these: https://bitbucket.org/zzzeek/sqlalchemy/issues/3163/use-deque-for-event-lists-so-that-remove https://bitbucket.org/zzzeek/sqlalchemy/commits/4a4cccfee5a2#Llib/sqlalchemy/event/api.pyT61 But since I'm not creating those events explicitly (I suspect the declared class creates them), I'm not sure about how to proceed. Full stacktrace if it's helpful: File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\orm\instrumentation.py", line 347, in _new_state_if_none state = self._state_constructor(instance, self) File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\util\langhelpers.py", line 754, in __get__ obj.__dict__[self.__name__] = result = self.fget(obj) File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\orm\instrumentation.py", line 177, in _state_constructor self.dispatch.first_init(self, self.class_) File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\event\attr.py", line 256, in __call__ fn(*args, **kw) File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 2943, in _event_on_first_init configure_mappers() File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 2822, in configure_mappers Mapper.dispatch._for_class(Mapper).before_configured() File "C:\Users\vToMy\PycharmProjects\sqlalchemy\lib\sqlalchemy\event\attr.py", line 217, in __call__ for fn in self.parent_listeners: RuntimeError: deque mutated during iteration -- 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 https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
