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 -~----------~----~----~----~------~----~------~--~---
