[Zope-dev] z3c.form: data manager for PersistentDict/PersistentMapping

[Michael Howitz]

Hello,

z3c.form.datamanager.DictionaryField is a data manager which is  
registered for fields on a dict. In its __init__ it checks whether the  
data object is an instance of dict. So this data manager does neither  
work for UserDict nor PersistentDict/PersistentMapping.
I'd like to change this but there are two possibilities and I'm not  
sure which is the best one:

1.) Add a subclasses of DictionaryField which is registered for  
UserDict and which checks whether the data object is an instance of  
UserDict.
     (PersistentDict and PersistentMapping are subclasses of UserDict.)

2.) Register DictionaryField for  
zope.interface.common.mapping.IMapping. This might have a problem as  
neither UserDict nor PersistentDict/PersistentMapping seem to provide  
this interface. (Why?)

Any suggestions?

Yours sincerely,
-- 
Michael Howitz · mh at gocept.com · software developer
gocept gmbh & co. kg · forsterstraße 29 · 06112 halle (saale) · germany
http://gocept.com · tel +49 345 1229889 8 · fax +49 345 1229889 1
Zope and Plone consulting and development