class Listing < ActiveRecord::Base
  has_many :domain_listings
  has_many :domains, :through => :domain_listings 
end

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class DomainListing < ActiveRecord::Base
  belongs_to :listing
  belongs_to :domain
end

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class CreateDomainListings < ActiveRecord::Migration

  def self.up
 
  create_table "domain_listings", :id => false do |t|
    t.column "domain_id", :integer
    t.column "listing_id", :integer
  end
end

def self.down
  drop_table :domain_listings
end

end