Anthony, could you elaborate a bit on that notation?
multiple=(0,3)

I wanted a maximum of two items and yet I need to write "3". In the book,
I've seen something similar with the limitby argument for DAL select:
>>>for row in db().select(db.person.ALL, limitby=(0, 2)): print row.name

which fetches "the first two, starting at zero" records.


On Friday, December 16, 2011, Anthony wrote:

> Shhh! It's a secret.
>
> Actually, it has been added to the new 4th edition, which should be
> available online soon.
>
> Anthony
>
> On Thursday, December 15, 2011 7:06:21 PM UTC-5, ニコノコ wrote:
>>
>> 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')
>>>>
>>>>
>>>>
>>>>

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