[rules-users] Rule For Counting Planning Variables/Entities

[Wolfgang Laun]

Do you have one DepartmentAssignment fact object per employee and
department AND month of the calendar?

-W

On 11/11/2013, newbie <dspecialist18 at yahoo.com> wrote:
> I am new user of drools and I'm trying to recreate an application similar
> to
> nurse rostering. This time assigning an employee to a department for a
> specific period of time. My hard constraint was an employee must be
> assigned
> to a department at least 3 months. My planning entity is
> DepartmentAssignment and planning variable Employee. The planning entity
> class looks like this:
>
> @PlanningEntity(difficultyComparatorClass =
> DepartmentAssignmentDifficultyComparator.class)
> @XStreamAlias("DepartmentAssignment ")
> public class DepartmentAssignment extends AbstractPersistable{
>
> 	private Duration duration; // per month
> 	private Department department;
> 	
> 	//Planning variable : changes during planning, between score calculations.
> 	private Employee employee;
>
> How can I make such rule? I tried using this but it seems not working. Am i
> missing something?
>
> rule "minimumNumberofMonths"
>     when
>     	$employee : Employee()
> 	$department : Department()
>     	$assignedNumberOfMonths : Number(intValue > 0 && < 3) from accumulate(
> 	    	$assignment: DepartmentAssignment(
> 	    		employee!= null,
> 	    		department== $department,
> 	    		employee== $employee
> 	    	), count($assignment)
>         )
>
>
>
>     then
>         insertLogical(new IntConstraintOccurrence("minimumNumberofMonths",
> ConstraintType.NEGATIVE_HARD,
>                 1,
>                 $employee, $department));
>
> end
>
>
>
> --
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