[rules-users] keep only one, retract all other

[Wolfgang Laun]

On 30/11/2012, Martin Minka <martin.minka at gmail.com> wrote:
> Thank you for the tip. What solution would you suggest to solve my problem
> ?

Look into the javadoc of java.util to find any class implementing List :-)
-W

>
> Martin
>
>
> 2012/11/30 Wolfgang Laun <wolfgang.laun at gmail.com>
>
>> You cannot use an interfact (List) to instantiate an object, which
>> is happening due to the collect.
>> --W
>>
>> On 30/11/2012, Martin Minka <martin.minka at gmail.com> wrote:
>> > I want to keep only 1 fact with id=="aaaa". But this is not working:
>> >
>> > rule "leave only one"
>> > when
>> >     $removeUs : java.util.List(size>1)
>> >         from collect(Fact(id=="aaaa")
>> > then
>> >     size = $removeUs.size();
>> >     for (int i=1; i < size; i++) {
>> >         retract($removeUs.get(i));
>> >     }
>> > end
>> >
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>>
>