[Zope] Re: _allowed_meta_types

[Maik Jablonski]

Richard Jennings wrote:
> Hi,
> 
> This is a subject which has already appeared in the mailing list, but I could not see
> an outcome, eg:
> 
> Jeff Kowalczyk jtk at adelphia.net 
>  Wed, 1 May 2002 01:09:20 -0400 et al.
> 
> I have some meta_types which depend on some services which can be started/stopped. 
> It would be elegant to stop the addition of instances when the services are not
> running by adding and removing the classes from the add list, as appropriate.
> 
> Has anybody solved the problem of modifying the add-list programmatically?

You must declare a method called all_meta_types(self) in your 
ObjectManager / Folder, which returns a list with the metatypes you want 
to allow to add. You can find a working example in:

http://www.zope.org/Members/mjablonski/PropertyFolder

Cheers, Maik