> Sorry, but it does not solve.
> I checked your code, and indeed I implemented the same way.
> Indeed, my code works if I make it generate arbitrary names.
> It just does not work if I try to name a new object after one of its
> attributes because:
> - the attribute value is not set at the time the object is created
> - I cannot have the add menu ask for it before actually adding (this 
> is what set_before_add should be meant for, I suppose)
> Just for info, I'm using Zope 3.1.
> I'm open to any other suggestion as to how have my contained objects
> (books) be added with thei ISBN code as name in their container.
> thanks
> Guido

Is there a reason you need the field to be 'id' instead of 'isbn'?

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