So I'm trying to use a hidden field to create some unique behavior in a 
form.  I want to send out the field when the form is first created (using 
the hidden=dict(...) keyword on SQLFORM).  But later, while processing the 
form through the error phase, I want to update that value to a different 
value using a "form.vars" or "request.post.vars" kind of mechanism.  But 
form.vars does not have hidden fields, and putting in a matching value for 
my hidden field is ignored when the form is passed back.

I can't change its value in the SQLFORM() process because the new value of 
the field is only known AFTER form creation and submission.  When it comes 
back, THEN I know what I want the value to be, but by this time the SQLFORM 
method has re-run and the value of the hidden field is fixed.

I'd like something like:

form = SQLFORM(.... hidden=dict(a='b')
. . . 
if form.validate():
. . .
elif form.errors:
form.var.a = 'c'

What am I missing?  Are hidden fields dumb, one-way-trip only fields?  Are 
they not modifiable along with the other fields?

-- Joe

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