[rules-users] Problem with memberOf and/or eval used in collect statement
Chris West
crayzfishr at gmail.com
Tue Sep 18 12:11:46 EDT 2007
All,
I'm having a problem using memberOf combined with a collect statement. My
test includes 3 rules each written to output the same results (I think), but
I get different results (depending on which version of Drools I use).
The rules are:
rule "TestMemberOf"
salience 10
when
$messages: ArrayList() from collect (Message(status == 100))
$wrappers: ArrayList() from collect (Wrapper(message memberOf
$messages))
then
System.out.println("TestMemberOf: " + $wrappers.size());
end
rule "TestEval1"
salience 9
when
$messages: ArrayList() from collect (Message(status == 100))
$wrappers: ArrayList() from collect (Wrapper($message: message,
eval($messages.contains($message))))
then
System.out.println("TestEval1: " + $wrappers.size());
end
rule "TestEval2"
salience 8
when
$wrappers: ArrayList() from collect (Wrapper($message: message,
eval($message.getStatus() == 100)))
then
System.out.println("TestEval2: " + $wrappers.size());
end
The output is (by version):
4.0.0
TestMemberOf: 0
TestEval1: 0
TestEval2: 2
4.0.1
TestMemberOf: 0
TestEval1: 2
TestEval2: 2
4.0.2.SNAPSHOT (taken 9/18/07)
TestMemberOf: 0
TestEval1: 2
TestEval2: 2
The correct output should be:
TestMemberOf: 2
TestEval1: 2
TestEval2: 2
Am I using memberOf correctly? Is there some issue using an eval to test
conditions on a list created by a collect?
Any help would be appreciated.
Attached is the full example.
Thanks,
-Chris West
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