[Zope] python products and properties

[Oliver Bleutgen]

>> From: zope-admin@zope.org [mailto:zope-admin@zope.org]On Behalf Of
>> Oliver Bleutgen

>> Right now I have to manually assign a newly added
>> property to already existing instances, because
>> adding the property in the _properties class
>> attribute breaks the properties management tab of
>> these instances.
>> Am I missing something? What do others do?

> class yourClass(parentClass):

>     _properties = parentClass._properties + (
>         {'id':'yourProperty', 'type': 'string'},
>     )

>     def __init__(self):
>         self.yourProperty = ''

> Something like this perhaps?

> regards

>     Max M

Thanks,
but then I would have to add a new class
for every property I change + old instance
wouldn't automagically get the new properties
(ideally with some default value).
I hoped there was a mechanism like there's
in zclasses, where I only have to change
the zclass to get the new properties.

Is my problem really one of the prices
which have to be paid in order to get the 
benefits of python products over zclasses?

cheers,
oliver