app/models/departments_user.rb
class DepartmentsUser < ActiveRecord::Base
belongs_to :department
belongs_to :user
#this model exists so that the join table can have the bool "active"
# and we use the "has_many through" relationship
#thus, a user can be deactivated in any given department without affecting the others.
#a user also now has a department-specific pay rate!
#woo-frickin-hoo y'all
end