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

[Martin Minka]

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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