class Suburb < ActiveRecord::Base
  set_primary_keys :city_id, :suburb_id
  has_many :streets,  :foreign_key => [:city_id, :suburb_id]
  has_many :first_streets,  :foreign_key => [:city_id, :suburb_id], 
          :class_name => 'Street', :conditions => "streets.name = 'First Street'"
end