This field will not fail validation when submitted empty. Web2py 2.8.2 with 
lazy tables and archiving.

REQUIRE_MSG = SPAN('Required', _style="color:orange;")

       Field(
            'problem_title', 
            length=512,
            required=True,
            comment=REQUIRE_MSG,
             )

Written this way, it works.

       Field(
            'problem_title', 
            length=512,
            required=True,
            comment=REQUIRE_MSG,
            requires=IS_LENGTH(
                minsize=1,
                maxsize=512,
                error_message='Problem title cannot be empty. Max 512 
characters.'
                )
       )

I didn't expect this ...

-- 
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- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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