validate_order_args

# File activerecord/lib/active_record/relation/query_methods.rb, line 1160
    def validate_order_args(args)
      args.each do |arg|
        next unless arg.is_a?(Hash)
        arg.each do |_key, value|
          raise ArgumentError, "Direction \"#{value}\" is invalid. Valid "                                 "directions are: #{VALID_DIRECTIONS.inspect}" unless VALID_DIRECTIONS.include?(value)
        end
      end
    end