[Zope3-Users] Re: formlib vs. cancel button

[Martin Aspeli]

Marius Gedminas wrote:
> On Thu, Feb 15, 2007 at 09:55:19AM +0000, Martin Aspeli wrote:
>> Dennis Schulz wrote:
>>> I dont know if it is the "proper" way,
>>> but when I return an empty string there is no validation error.
>>>
>>> This was also one of the strangest things I found out with formlib.....
>> I found that returning {} also works.
> 
> The validator is supposed to return a list of errors.  Neither '' nor {}
> are lists.  () is a list.  I use
> 
>     @form.action("Cancel", validator=lambda *a: ())
>     def cancel(self, action, data):
>         ...
> 
>> But this is clearly a design 
>> weakness if there is no other way of doing it. Something like 
>> validator=NULL_VALIDATOR would be fine, or some kind of decorator.
> 
> +1 for allowing
> 
>     @form.action("Cancel", validator=form.no_validation)

I added something similar to plone.app.form, but there really, really 
should be support for this use case in formlib in a non-hacky way.

Thanks!
Martin