activerecord/lib/active_record/migration/join_table.rb


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module ActiveRecord
  class Migration
    module JoinTable #:nodoc:
      private

      def find_join_table_name(table_1, table_2, options = {})
        options.delete(:table_name) || join_table_name(table_1, table_2)
      end

      def join_table_name(table_1, table_2)
        [table_1.to_s, table_2.to_s].sort.join("_").to_sym
      end
    end
  end
end