validate_order_args

# File activerecord/lib/active_record/relation/query_methods.rb, line 1023
    def validate_order_args(args)
      args.select { |a| Hash === a  }.each do |h|
        unless (h.values - [:asc, :desc]).empty?
          raise ArgumentError, 'Direction should be :asc or :desc'
        end
      end
    end