Hello, I am a complete beginner building my first web application with 
web2py.

I have a form that displays a dropdown list and also has a file upload 
option. I want the user to do one of the two. Either choose an entry from 
the list or upload a file.
I cannot figure out a way to do it with validators. Any suggestions are 
welcome.

Thank you,

Here is the form:

*controller:*

def do_proc():
    form = SQLFORM.factory(
        Field('your_data', requires=IS_IN_DB(db,db.udata.id,'%(title)s')),
        Field('your_file', 'upload', requires=IS_NOT_EMPTY()))
    form.process()



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