I found (i guess) a way to iterate over list, but it is not comparing and assigning the workorder now. I tried this way:

-----------------

rule "requiredSkill"

   when

       There is an unassigned workorder

       and the workorder has a requiredSkill other than null

       and there is an engineer

       and the engineer has a skill other than null

       and engineer skill is the same as workorder skill

   then

       assign workorder to engineer

engineer

-----------------

this is how i tried implementing;

-----------------

rule "requiredSkill"

when

$workOrder : WorkOrder() 

   $woReqSkill : SkillWorkOrder($requiredSkillWO : skill , eval(skill != null)) from $workOrder.requiredSkills 

   

   $engineer : Engineer()

   $engineerSkill : SkillEngineer($engSkill : skill, eval(skill != null)) from $engineer.skillEngineerList

   

   exists SkillEngineer( $engineerSkill.skill == $woReqSkill.skill )

then

insertLogical(new IntConstraintOccurrence("requiredSkill", ConstraintType.NEGATIVE_HARD,

1, $engineer));

end

-----------------

But all workorders are going to the same one, it is not validating if one is equals to other.

2013/2/18 André Fróes <arfmoraes@gmail.com>

Hello everyone!

How can I compare 2 lists with a rule?

I upgraded my basic model to a more complex one now, but now I hit a wall. My WorkOrder have a List of skills, and my Engineer also have a list of Skills and I have to compare one with another.

Example:

Engineer A have skill ABC 1

Engineer B have skill ABC 2

Engineer C have skill ABC 3

WorkOrder A needs an engineer with skill ABC 3

WorkOrder B needs an engineer with skill ABC 1

WorkOrder C needs an engineer with skill ABC 2

The result should be this:

Engineer A will receive WorkOrder B

Engineer B will receive WorkOrder C

Engineer C will receive WorkOrder A

---------------

I am able to sort it by time, but not by skill, and I don't know how to loop over each list to find if one have the skills needed to fulful the other. These are my classes involved:

WorkOrder attributes:

--------

private int requiredWorktime;

private Priority priority;(enum)

private Severity severity;(enum)

private List<SkillWorkOrder> requiredSkills;

--------

Engineer attributes:

--------

private int worktime;

private String name;

private List<SkillEngineer> skillEngineerList;

--------

Skill attributes:

--------

private String name;

--------

both SkillEngineer and SkillWorkOrder are classes that simple receives the named class and a Skill:

Eg:

private Engineer engineer; //Or WorkOrder

private Skill skill;

Is it possible to iterate over these 2 lists, by drool rule, to check wich engineer have most coincidences with an workorder? (Eg: if and Engineer have skill ABC1, ABC2 and a WorkOrder needs an engineer with skill ABC1, ABC2 and ABC3 he would be choseng among the others because his skills)