Please, give code example!

[qawsed55]

Hello!
Sorry for pore English (
I have some projects, trackers, roles and users.
I need to change assignee, when status changing: for tracker_in_project (other projects with this trackers will have another setup).
As I think (may be wrong), easiest way to setup array with all I need and code will parse this and make all magic.
Here pic with, where I try to explain:

Code will be something like (sorry, I do no know Ruby at all) :

If status in project_name with tracker_name changes from status_was to status_is
change assignee to user_name (or group_name)

array_to_change {
PROJECT A, TRACKER1, STATUS1, STATUS2, Mike;
PROJECT A, TRACKER1, STATUS2, STATUS3, Anna;
PROJECT A, TRACKER1, STATUS2, STATUS4, Anna;
PROJECT A, TRACKER1, STATUS3, STATUS1, George;
}

Looks like this function has Additionals plugin, but without settings and just for one status\role