On Thursday, March 30, 2017 at 6:17:25 AM UTC-4, Frank Claessen wrote:
>
> Thx Nico,
>
> I just figured out that it is indeed a string. However, as soon as I 
> select more than 1 row, it becomes a list. I was under the assumption that 
> it is always a list - appears not to be true.
>
> Perhaps a suggestion to use one single format - list??
>

When you post data from a single checkbox, web2py has no way of knowing 
that the item could in some circumstances be part of a list and that you 
therefore want it in a list. You are responsible for writing such code. It 
would not make sense to put all checkbox values in lists, and even if it 
did, web2py doesn't know that a given form value came from a checkbox (the 
browser just sends the field name and value, not its type).

Note, in some circumstance, web2py does handle this for you. For example, 
if you use the IS_IN_SET or IS_IN_DB validators with multiple=True, when 
only a single item is selected, web2py will still return that item in a 
list (after running the validator).

Anthony

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