rajasekhar911 wrote: > > 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.
can you send a full example please including how you've implemented `__getattr__`. > > 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 -~----------~----~----~----~------~----~------~--~---
