Making not_empty depend on other fields

Hi,

I have a form, on which some fields may be optional or compulsory, depending
on the value of a different field. I'm using FormEncode, ToscaWidgets and
TurboGears. I have a hacky solution, looking for a neater one.

I realise I could use a compound validator, but this won't give me the error
reporting I want. I'd like the "please enter a value" message to appear next
to the fields. Using a compound validator would put a message like
"department: please enter a value" at the bottom of the form.

The current solution I have is:
schema.py is modified so if the field "invtype" is present, it is processed
first.
the validator for invtype sets some information on cherrypy.request about
what fields will be compulsory.
the validators for switchable compulsory/optional fields have not_empty set
to a property, which looks at cherrypy.request

The main problem is that this needs modifications to FormEncode. I did try
using pre_validators to force that field to go first, but it didn't work -
no exception, I just ended up getting no data or errors from the validator.
If someone can suggest another way to do this, that would be great!

Also, I couldn't use FormEncode's state mechanism, I think because
ToscaWidgets breaks up the validation. Using cherrypy.request seems a bit
hacky, but works fine really.

Any suggestions would be welcome,

Paul

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