Near the end of this section 
<http://web2py.com/books/default/chapter/29/07/forms-and-validators#Validators> 
of the book, it notes that the only validators that work with list:-type 
fields are IS_IN_SET(..., multiple=True), IS_IN_DB(..., multiple=True), 
IS_NOT_EMTPY(), and IS_LIST_OF(). The latter can be used to apply 
IS_ALPHANUMERIC() to each item in the list.

Anthony

On Monday, March 30, 2015 at 9:23:01 AM UTC-4, LoveWeb2py wrote:
>
> Hello,
>
> When using a list:string my validators don't work like they used to on a 
> regular string. For example if I had requires=IS_ALPHANUMERIC()
>
> when I input 1234568--/ I would receive an error
>
> but when I switched my field type from string to list:string I can now put 
> anything in the field such as 1234568--/ and it works. I also noticed the 
> SQLFORM.GRID does not allow you to specify that column in the dropdown list 
> anymore. Why is there no exception for list handling?
>

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