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" <[email protected]> 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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