[Python] How to implement this variation on a Timefold constraint

Consider the following constraint in the Timefold documentation (see this page):

def too_many_visits(factory: ConstraintFactory) -> Constraint:
return (factory.for_each(Visit)
.group_by(lambda visit: visit.vehicle, ConstraintCollectors.count())
.filter(lambda vehicle, visit_count: visit_count > 10)
.penalize(HardSoftScore.ONE_HARD,
lambda vehicle, visit_count: visit_count - 10)
.as_constraint("too_many_visits");
)


After the group_by, a filter is applied to vehicle, visit_count pairs. I wonder how to set this up so that I can apply a filter to visit, vehicle, visit_count triples, where the vehicle is visit.vehicle and visit_count is the amount of vehicle visits?

This sounds like it should be pretty easy to do, but I haven't figured out a way to do it yet.

Continue reading...