[web2py] request.vars returning as Nonetype

[Andrew Evans]

Hello I am trying to validate a form entry against existing entries in my
database on form submission. But user_start and user_end are returning as
None Type. How do I get the values of a form using SQLFORM

*cheers

      if form.accepts(request.vars):
            for project in project_date:
                start = project.date_in
                end = project.date_out
                user_start = request.vars.checkout_date_in
                user_end = request.vars.checkout_date_out
                if start <= user_start <= end or start <= user_end <=
end:
                    return dict(redirect(URL('error','availability')))
                else:
                    session.flash = 'form accepted'
                    return dict(redirect(URL('default', 'next')))

*cheers and ty

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