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...
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