According to the documentation (http://www.web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Field-types), `list:string` does not have a validator. Maybe you can create your own?

On 16-05-2018 22:26, Martin Weissenboeck wrote:

That is ok:
form = SQLFORM.factory(
        Field("auswahl", "string", length=15, requires=IS_LENGTH(15,3)),
        )

This does not work:
form = SQLFORM.factory(
        Field("auswahl", "list:string", length=15, requires=IS_LENGTH(15,3)),
        )


​Regards, Martin​

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