the error can be reproduced by adding __getattr__ method to the model class. my model class has some attributes that are lazy initialized and are not mapped to any table columns. i am using the getattr method to implement the lazy initialization.
On Jul 31, 6:15 pm, Michael Bayer <mike...@zzzcomputing.com> wrote: > theres no way to know unless you can illustrate how to reproduce the > issue fully. one hunch is that your mappers are not compiled (try > calling compile_mappers()). > > On Jul 31, 2009, at 3:39 AM, rajasekhar911 wrote: > > > > > is it because of lazy initialization? > > I have some other attributes in my class which are lazy initialized. > > But these are not mapped to columns. > > > On Jul 31, 11:44 am, rajasekhar911 <rajasekhar...@gmail.com> wrote: > >> i have upgraded to 0.5.5 > >> Now the error changed to > >> AttributeError: 'NoneType' object has no attribute 'modified_event' > >> Module sqlalchemy.orm.attributes:150 in __set__ view > >> << def __set__(self, instance, value): > >> self.impl.set(instance_state(instance), instance_dict > >> (instance), value, None) > > >> def __delete__(self, instance):>> > >> self.impl.set(instance_state(instance), instance_dict(instance), > >> value, None) > > >> Module sqlalchemy.orm.attributes:447 in set view > >> << else: > >> old = dict_.get(self.key, NO_VALUE) > >> state.modified_event(dict_, self, False, old) > > >> if self.extensions:>> state.modified_event(dict_, > >> self, False, old) > > >> AttributeError: 'NoneType' object has no attribute 'modified_event' > > >> it seems instance_state(instance) returns None. > > >> On Jul 30, 7:51 pm, "Michael Bayer" <mike...@zzzcomputing.com> wrote: > > >>> theres nothing about the given code that should cause any issue > >>> (and I > >>> tried it on 0.5.1). Upgrade to 0.5.5 in any case and that will > >>> almost > >>> certainly resolve the issue. > > >>> rajasekhar911 wrote: > > >>>> I am using declarative method to map objects. > >>>> I am getting the following error when i try to create the object > > >>>> My Class is > >>>> from sqlalchemy.ext.declarative import declarative_base > >>>> DeclarativeBase = declarative_base() > >>>> class User(DeclarativeBase): > >>>> __tablename__='managed_nodes' > >>>> id = Column(String(50), primary_key=True) > >>>> username=Column(String(50)) > > >>>> def __init__(self,username = None,id = None): > >>>> self.username = username > >>>> if not id: > >>>> self.id = username > >>>> else: > >>>> self.id = id > > >>>> u = User(username='xxx') > > >>>> Module model.User:63 in __init__ > >>>> self.username = username > > >>>>>> self.username = username > >>>> Module sqlalchemy.orm.attributes:151 in __set__ view > >>>> << def __set__(self, instance, value): > >>>> self.impl.set(instance_state(instance), value, None) > > >>>> def __delete__(self, instance): > >>>>>> self.impl.set(instance_state(instance), value, None) > >>>> Module sqlalchemy.orm.attributes:440 in set view > >>>> << old = self.get(state) > >>>> else: > >>>> old = state.dict.get(self.key, NO_VALUE) > > >>>> state.modified_event(self, False, old) > >>>>>> old = state.dict.get(self.key, NO_VALUE) > >>>> AttributeError: 'NoneType' object has no attribute 'dict' > > >>>> what can be the possible reason?? > >>>> my sqlalchemy version is 0.5.1 on centos5.2... --~--~---------~--~----~------------~-------~--~----~ 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 sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
