monkeypatching.rb

module DataMapper
  class Query
    alias :old_assert_valid_order :assert_valid_order
    def assert_valid_order(order, fields)
      old_assert_valid_order(order, fields) unless !order.nil? && order.any? { |p| p.is_a?(Direction) && p.property.name == :sort_order }
    end
  end
end