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I cannot disagree this is low-priority, soft constraint.

The use case is very simple - each of our teachers lists her preference for off day(s).
So she would give us for example 2 possibilities for her off-day....
We can ignore, however we try to maximize "happiness" in our school

Need a refinement for this constraint which will specify preferred working days for the teacher.

For example teacher T is working 4 (out of 5) days a week, however her off day must be either Tuesday or Thursday.

Thanks!

Cool!  Implemented.
Works fine! Thanks!

Implemented min days (grammatically) - works fine! Thanks!

I have multiple activity_tags assigned to each activity.
It is not allowed for 2 activities who share an activity_tag to be scheduled on the same day for a student group. 

I am aware I can use "min days between a set of activities" constraints -  but this requires generating enormous number of constraints. Is there more elegant way ?

Lets assume 3 computers (rooms)  "comp1","comp2","comp3"

Lets assume activity #1 needs 2 computers - then I need to add to it 2 pseudo activities one for room "comp1" and one from room "comp2".

Lets assume activity #2 needs 1 computer -  then I need to add to it 1 pseudo activity, let say for room "comp1"

It will not be possible to schedule both activities in parallel - as the rooms are named.
Unless there is a way to tell FET there are 3 X "comp" rooms and have the pseudo activity ask for room "comp".

a) This will not work as each activity requires multiples of the resource - and there is no way
     to  allocate for each activity the right quantity.

b) Not sure... to my best understanding this will only work if named computers will be specified
    for each activity - however if there is no identity to the computers, and they are all interchangeable
    this variant will not do.

I need to implement a constraint that allocates N units of resource R to an activity.
In any point in time max T units are available for allocation.

(example: activity which requires 3 computers for the group, total available computers in school 10)


Possible ?  How ?

Thanks