Thanks Anthony. I don't think I've seen that in the docs.
On Thursday, December 15, 2011, Anthony wrote:
> Try
>
> IS_IN_DB(..., multiple=(0, 3))
>
> The "multiple" argument to IS_IN_SET and IS_IN_DB can be a list or tuple
> specifying a minimum and maximum number of items to be selected (strictly
> less than on the max, so set the max to 3 to make sure there are no more
> than 2).
>
> Anthony
>
> On Wednesday, December 14, 2011 11:19:40 PM UTC-5, ニコノコ wrote:
>>
>> I have a list:reference field and would like a user to select none or up
>> to two values from the list
>>
>> I could validate by calling onvalidation but I'm wondering if there's any
>> built-in validator that should work? I've tried the following, none of
>> which worked for me:
>>
>> - IS_LENGTH(minsize=0,maxsize=2)
>> - IS_EXPR('len(value)<=2')
>>
>>
>>
>>
