[rules-users] Hard constraint on selecting a skill

[André Fróes]

Beside the line "not Engineer(skill == $....." i managed to get close of
that, but my system is way simpler, withing WorkOrder pojo, i have a skill
and within Engineer pojo, also a skill field, both int field. So I wouldn't
be able to do the EngineerSkillRelation as you described since engineer
does not have a field to call itself.

basically, the objects are
WorkOrder
  - id (inherited from abstractpersistable) (long)
  - requiredWorkTime (int)
  - requiredSkill (int)
  - Engineer engineer

Engineer
   - worktime (int);
  - name (String);
  - skill (int);

So, if I try something like this:

rule "assignSkillWOToSkilledEngineer"
  when
  $wo : WorkOrder( $requiredSkill : requiredSkill, $engineer : engineer  )
  not Engineer(skill == $requiredSkill)
      then
      insertLogical(new
IntConstraintOccurrence("assignSkillWOToSkilledEngineer",
ConstraintType.NEGATIVE_HARD,1, $wo));
end

it runs, but does not sort.


2013/2/7 Geoffrey De Smet <ge0ffrey.spam at gmail.com>

>
> Op 07-02-13 15:15, André Fróes schreef:
>
> Hello!
> I'm still not getting good with drools rules, i'm trying several examples
> and basic ones. Some i did without any problem and understood plenty well,
> but when I try to make an approach to what i'm aiming, I'm not able to.
>
>  Right now I'm trying to compose this:
>
>  When
>    there's an workorder with skill
>    and there's and engineer with the skill and capable of doing that
> workorder
> then
>    the engineer should do it
>
>  So i tried something like this:
>
>  rule "assignSkillWOToSkilledEngineer"
>  when
>  $wo : WorkOrder( $requiredSkill : requiredSkill  )
>  $engineer : Engineer(skill == $requiredSkill)
>
> there's no restriction that the WorkerOrder is assigned to that engineer,
> so it matches with every engineer of that skill?
>
>   then
>  insertLogical(new
> IntConstraintOccurrence("assignSkillWOToSkilledEngineer",
> ConstraintType.NEGATIVE_HARD,
>  1, $engineer));
>
> the cause $engineer is a problem: If an engineer combines with 2
> workorders, it will only count for 1 point due the way insertLogical work.
> Normally the causes are the planning entities involved.
> Try
> insertLogical(new
> IntConstraintOccurrence("assignSkillWOToSkilledEngineer",
> ConstraintType.NEGATIVE_HARD,
> 1, $wo));
>
>   end
>
>   I would write it like this (pseudo code):
>
>  rule "assignSkillWOToSkilledEngineer"
>  when
>  $wo : WorkOrder( $requiredSkill : requiredSkill, $assignedEngineer :
> assignedEngineer  )
>  not EngineerSkillRelation(skill == $requiredSkill, engineer ==
> $assignedEngineer)
>
>       then
>                 insertLogical(new
> IntConstraintOccurrence("assignSkillWOToSkilledEngineer",
> ConstraintType.NEGATIVE_HARD,
>                   1, $wo));
>  end
>
>  i get no exceptions, but the sort is not working properly
>
>
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