[Zope] Set _allowed_meta_types on folder instances without creating a new product?

[Dieter Maurer]

Jeff Kowalczyk writes:
 > > I told you how to define "_allowed_meta_types" on a per instance
 > > basis but did not check that "_allowed_meta_types" has the desired
 > effect.
 > > When your message above arrived, I tried to find a use
 > > of "_allowed_meta_types", but the Zope sources do not
 > > reference it. Where do you know about it?
 > 
 > I've been using it in mxmObjectManager derived product classes to limit
 > the Metatype list.
 > ...
 > It works exactly as expected, but it would be very useful to apply this
 > to existing folders which are specialized in purpose, but require no
 > special class of their own.
To apply it to existing folder, you need to redefine their
"all_meta_types" method - in a similar spirit the "mxmObjectManager" did...


Dieter