[rules-users] Optaplanner rule to assign employee only to shift when he/she has the skills

[ns]

Thanks for the reply. It helped to see my mistake. I have now simplified the
rule for testing purposes. I now have:

rule "alternativeSkill"
    when
        $skill : Skill(code == '1')
        $employee : Employee()
        not SkillProficiency(employee == $employee, skill == $skill)
    then
        scoreHolder.addHardConstraintMatch(kcontext,
-1);//scoreHolder.addSoftConstraintMatch(kcontext, -
$contractLine.getWeight());
end

I have three employees and 19 shifts. 1 employee has the necessary skills to
do the shifts, the other 2 not. When I run the program I get:

14:42:19.237 [main] DEBUG o.o.c.i.l.DefaultLocalSearchSolverPhase -     Step
index (135), time spend (20000), score (-2hard/-182soft),     best score
(-2hard/-182soft), accepted/selected move count (85/252) for picked step
(2013-12-09(Mon)_intake->evgey_Intaketeam(Evelien Geysen - Intaketeam) <=>
2013-12-05(Thu)_intake->mavan_Intaketeam(Marie Van de Vliet - Intaketeam)).
14:42:19.237 [main] INFO  o.o.c.i.l.DefaultLocalSearchSolverPhase - Phase
(1) localSearch ended: step total (136), time spend (20000), best score
(-2hard/-182soft).
14:42:19.237 [main] INFO  o.o.core.impl.solver.DefaultSolver - Solving
ended: time spend (20000), best score (-2hard/-182soft), average calculate
count per second (19839).

I get 2 hard errors as expected. But the best solution still assigns all
three employees to the shifts. Why do I not get a solution where only the
one qualified employee is assigned to all shifts? That way I would get 0
hard errors. Am I missing something?



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