Little update: If I remove "self.__dict__ = self" from _Struct definition exception is not raised.
This is the original base class: class _Struct(dict): def __init__(self,**kw): dict.__init__(self, kw) self.__dict__ = self On Feb 22, 12:20 pm, Andrea <andrea.dellapie...@gmail.com> wrote: > Hi all, > I have some object on a pre-existing model. Now we want to add a > persistance layer and so SQLAlchemy/SQLite will be our choice. > When I add an object to session a UnmappedInstanceError is raised: > Class 'try_sqlalchemy.example2.applib_model.DescriptorBean' > is mapped, but this instance lacks instrumentation. This occurs when > the instance > is created before > sqlalchemy.orm.mapper(try_sqlalchemy.example2.applib_model.DescriptorBean) > was called. > > This is the example, three code snippets from three python > modules:http://pastebin.com/KLFFN3ke > > On debug I see that the DescriptorBean instance is created after the > mapping (mapping is created on startup.createSchema method) so I don't > understand the error message. > The same problems if I use declarative and inherit from Base (class > DescriptorBean(Base, _Struct)). No problems if I have a class that > inherits directly from object. Maybe is _Struct inheritance that > destroys mapper instrumentation? Any suggestion? > > Thanks, > Andrea -- 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.