[Zope-CMF] validateMetadata

[Dieter Maurer]

Tres Seaver writes:
 > > Is there for that situation a way to rollback the editMetadata
 > > call? I'm not a undo / rollback-expert :-) so sorry for asking
 > > the obvious.
 > 
 > Because writes to the ZODB are transactional, it is perfectly
 > fine to first write the attributes and then test them:  if
 > 'validateMetadata' raises an exception, the writes will be
 > rolled back.
In my view, this is not completely satisfactory, because I usually
do not want to raise an exception. Instead, I would like to
redisplay the form with error information.
I know, I can use 'raise type="redirect"' for this, but it is
quite clumsy to pass the error information through the "redirect".


Dieter