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)