I do not remember but please open a ticket and I will look at this asap.

On Tuesday, 18 November 2014 02:02:53 UTC-6, Manuele wrote:
>
>  Il 18/11/14 05:54, Massimo Di Pierro ha scritto:
>  
> Problem is that IS_LIST_OF experts to validate a list. Instead you are 
> passing "" (not a list) and None (also not a list). 
> I agree that it is odd that interprets '' as [] and None as [None].
> They should either be interpreted as [''] and [None] or both as an empty 
> list.
>
>  Your proposed fix makes sense and I would take a patch.
>
> Thank you Massimo!
>
> the problem is that every time you don't insert any value in the field a 
> null string is validated (i.e. "").
> As I can see from code[1] it seams to me the validator expects any kind of 
> value and if it's not a list/tuple it insert into a list and validate it.
> Another problem is that[2] if the result of the operation 
> str(item).strip() is evaluated as False any validation is applied... so 
> there's no way to oblige the user not to pass a null value (i.e. to insert 
> any value).
>
> Could it be ehough to remove the line 2520[2]? Why it has been introduced?
>
> Cheers
>
>     Manuele
>
>
> [1] https://github.com/web2py/web2py/blob/master/gluon/validators.py#L2508
> [2] https://github.com/web2py/web2py/blob/master/gluon/validators.py#L2520
>  

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