About zero option, search in page for zero :
http://www.web2py.com/book/default/chapter/07

<http://www.web2py.com/book/default/chapter/07>There is some explanation
near IS_IN_SET...

There maybe more detailed information somewhere else too... I don't use it
in my code since it arrive after I start my dev or I was not aware at the
begining... I should make refoctoring ;-)

Richard

On Tue, Apr 5, 2011 at 3:16 AM, Johann Spies <[email protected]> wrote:

> On 4 April 2011 16:11, Richard Vézina <[email protected]> wrote:
>
>> Are course_week1 and course_week2 not null??
>>
>>
> No.
>
>
>> If not you need ...requires=IS_NULL_OR(IS_IN_DB(your requires) and in
>> ...represent= you should use zero option (see book about that) or something
>> like that :
>>
>> db.t_registration_form.course_week1.represent=\
>>     lambda value: (value!=None and "%(code)s" %db.courses[value]) or
>> 'None'
>>
>>
> Thanks!  That solved the problem.  I could not find something in the book
> about a 'zero option' though.
>
> Regards
> Johann
>
> --
>  May grace and peace be yours in abundance through the full knowledge of
> God and of Jesus our Lord!  His divine power has given us everything we need
> for life and godliness through the full knowledge of the one who called us
> by his own glory and excellence.
>                                                     2 Pet. 1:2b,3a
>
>

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