[ic] Interchange demo: userdb mail_list field cannot be set to empty

[Mike Heins]

Quoting Stefan Hornburg (Racke) (racke at linuxia.de):
> Ton Verhagen wrote:
> >
> >Quoting Mike Heins wrote:
> >
> >>Quoting Ton Verhagen (ton at verhagen.net):
> >>>
> >>>Ton Verhagen wrote:
> >>>
> >>>>Dear IC'ers,
> >>>>
> >>>>In the current demo on www.icdevgroup.org it is not possible to set
> >>>>the userdb field mail_list to an empty value.
> >>>>In other words, users are not able to unsubscribe from all mailing
> >>>>lists. The last value always remains active.
> >>>>
> >>>>The demo uses a multiple select box for this feature. I have also
> >>>>tried checkboxes with no avail.
> >>>>
> >>>>Any ideas?
> >>>
> >>>
> >>>Apparently an empty cgi variable does not overwrite an existing value
> >>>variable.
> >>>
> >>
> >>This is not true at all.
> >>
> >>You can test it yourself:
> >>
> >>   
> >>http://demo.icdevgroup.org/i/demo1/ord/checkout?fname=ton&mv_action=refresh 
> >>
> >>
> >>That will show your name. Now do:
> >>
> >>   
> >>http://demo.icdevgroup.org/i/demo1/ord/checkout?fname=&mv_action=refresh
> >
> >
> >You might be right in this regard.
> >
> >But please try similar things with check boxes and/or multiple selects:
> >an empty selection (no checkboxes ticked) won't overwrite an existing 
> >value in the session.
> >
> 
> Yeah, but the better solution is probably do set the mail_list value inside
> "Save_database" scratch.

Yes, or something. You could do:

	[calc]
	    $Values->{mail_list} ||= 'none';
	    return;
	[/calc]

-- 
Mike Heins
Perusion -- Expert Interchange Consulting    http://www.perusion.com/
phone +1.765.328.4479  <mike at perusion.com>

There's nothing sweeter than life nor more precious than time.
-- Barney