[Product-Developers] Re: unique title

jjmojojjmojo joshjohnson.cpc at gmail.com
Tue Jul 1 12:20:41 UTC 2008

Nagarjuna G. wrote:
> Hello,
> The product I am developing (Archetypes product) requires each content
> object to have a site wide unique id, where the id is based on the
> user supplied title string.
>  The statement  " _at_rename_after_creation = True" takes care of
> creating unique ids.  However when the user supplies same title next
> time the object still gets created with 'supliedtitle-1',
> suppliedtitle-2 etc.  I want to inform Plone that title is unique.  I
> looked at the documentation, but could find any clue.  Can some one
> give me a direction.  It will be very nice if the schema definition
> allows an option like "unique=1".  Is this possible?
The best way I can think of is to set up a custom validator for that 
field, then do the check yourself.

I haven't done this yet myself, but the entry for 'validators' in the 
common field attribute list here: 
is a good place to start.


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