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

Mike Heins mike at perusion.com
Thu Nov 5 17:27:54 UTC 2009

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:


That will show your name. Now do:


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

Experience is what allows you to recognize a mistake the second
time you make it. -- unknown

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