app/models/recruiter/city.rb
module Recruiter
class City < ActiveRecord::Base
delegate :to_s, to: :name
belongs_to :state
validates :name, presence: true, uniqueness: { case_sensitive: false, scope: :state_id }
scope :with_open_jobs, ->{ where(id: Job.open.select(:city_id).uniq) }
end
end