[rules-users] Can I check if a collection contains one, and only one item of another collection

[Scott Burrows]

You have the answer in your example, reserved word "contains" will give you
that information.

Scott Burrows



On Sat, Aug 23, 2008 at 9:23 AM, David Cracauer <dcracauer at earthlink.net>wrote:

>
> Hi,
> I'm getting stuck on this and I'm hoping someone can help..
> I need to be able to check that a collection contains one, and only one
> item
> from another collection.
>
> Ideally, I would do something like this:
>
>  a:Answer(responses contains one of ("a","b","c"));
>
> Is there a way do do this without resorting to evals or predicate
> expressions? (drools 4.07)
>
> Thanks,
> Dave
>
>
>
> --
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>
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