> What is preventing you from simply mapping different classes ?
Different Customers uses different (her own) table spaces. So we must map a
Class to different tables.
You remove entity_name, but how you specify the 'user dependent storage' in
sqlalchem 0.5? This behavior is a typical orm-property. I know its a
"enterprise requirement". But it is the reason why I use sqlalchemy.
I spent some time to migrate to sqlalchemy 0.4 and it's to late to go back to
0.3. What can I do to add objects to properties (InstumentedLists) in
sqlalchemy 0.4 (with different mappers)?
Thanks
tyr
----- Original Nachricht ----
Von: Michael Bayer <[EMAIL PROTECTED]>
An: sqlalchemy@googlegroups.com
Datum: 13.10.2008 17:42
Betreff: [sqlalchemy] Re: 0.4: can not append objects to instrumentedlists
>
> the entity_name feature is somewhat broken in 0.4 and has been removed
> entirely in 0.5 - there's too much ambiguity in its usage (namely, the
> attributes/behavior of a class cannot be determined until the class is
> associated with a specific mapper via the session). Its possible
> that this is related to the issue you're having.
>
> What is preventing you from simply mapping different classes ?
>
>
>
>
> On Oct 13, 2008, at 11:31 AM, [EMAIL PROTECTED] wrote:
>
> >
> >
> >
> > I use entity_name's for all mappers. So I dont have mappers with
> > entity_name = None.
> >
> > With sqlalchemy 0.4 I run into errors if I try to add objects to
> > InstrumentedList's:
> >
> > (Pdb) len( self.users )
> > 1
> > (Pdb) self.users
> > [<common.User object at 0x1d1992a8>]
> > (Pdb) type( self.users )
> > <class 'sqlalchemy.orm.collections.InstrumentedList'>
> > (Pdb) self.users.append( user )
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/collections.py",
> > line 921, in append
> > item, _sa_initiator)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/attributes.py", line
> > 517, in fire_append_event
> > ext.append(instance, value, initiator or self)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/attributes.py", line
> > 713, in append
> > getattr(child.__class__, self.key).impl.append(child._state,
> > instance, initiator, passive=True)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/attributes.py", line
> > 294, in append
> > self.set(state, value, initiator)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/attributes.py", line
> > 437, in set
> > old = self.get(state)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/attributes.py", line
> > 278, in get
> > callable_ = self._get_callable(state)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/attributes.py", line
> > 255, in _get_callable
> > return self.callable_(state.obj())
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/strategies.py", line
> > 318, in class_level_loader
> > localparent = mapper.object_mapper(instance)
> > File "SQLAlchemy-0.4.8-py2.4.egg/sqlalchemy/orm/util.py", line 371,
> > in object_mapper
> > raise exceptions.InvalidRequestError("Class '%s' entity name '%s'
> > has no mapper associated with it" % (object.__class__.__name__,
> > getattr(object, '_entity_name', entity_name)))
> > InvalidRequestError: Class 'User' entity name 'None' has no mapper
> > associated with it
> >
> >
> > It is a mistake on my part or a bug/broken feature (I migrate from
> > sqlalchemy 0.3 and it works with 0.3)?
> >
> > thanks and greetings,
> > tyr
> >
> > >
>
>
> >
>
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