[Zope-CMF] validateMetadata

[Tres Seaver]

Antwan Reijnen wrote:

> your help is very much appreciated, thanks again. 
> 
> I wonder however: suppose the metadata is not valid. I first have
> to store it, and ony AFTER storing takes place, I can test it.
> 
> 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.

Tres.
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Tres Seaver                                tseaver@zope.com
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