app/models/agency_role.rb
class AgencyRole < ActiveRecord::Base
has_and_belongs_to_many :agency_people,
join_table: 'agency_people_roles'
validates_presence_of :role
validates_length_of :role, maximum: 40
ROLE = {JD: 'Job Developer',
CM: 'Case Manager',
AA: 'Agency Admin'}
validates :role, inclusion: ROLE.values
end