[rules-users] accumulate over multiple types
I 'd like to get the number of queens which have the same y.
I used to do this with a query:
query "multipleQueensHorizontal"
Queen($id : id, $y : y);
Queen(id > $id, y == $y);
end
And then ask the size() of it.
But now I should be able to do this with the accumulate function:
$multipleQueensHorizontal : Integer()
from accumulate(
$q1 : Queen($id : id, $y : y);
Queen(id > $id, y == $y);
, count($q1)
);
However, I get a parsing error on it:
Caused by: org.drools.rule.InvalidRulePackage: [31,37]: unknown:31:37
Unexpected token ';'[33,6]: unknown:33:6 mismatched token:
[@123,814:814=',',<12>,33:6]; expecting type THEN
Apparently the ; in of "$q1 : Queen($id : id, $y : y);" is inacceptable?
--
With kind regards,
Geoffrey De Smet