tried this?
requires=IS_EMPTY_OR(IS_IN_SET(...))

2017-04-10 14:07 GMT+02:00 Karoly Kantor <kar...@kantor.hu>:

> I have a picklist type of field where the user selects from a set of
> predefined values. I am using IS_IN_SET(list_of_values) in the Field
> constructor.
> The form cannot be saved unless a value is selected, i.e. the field is
> essentially a required field.
>
> I would like to allow the user NOT to select a value, and still be able to
> save the form.
>
> --
> Resources:
> - http://web2py.com
> - http://web2py.com/book (Documentation)
> - http://github.com/web2py/web2py (Source code)
> - https://code.google.com/p/web2py/issues/list (Report Issues)
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-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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