gistfile1.rb

# lib/multi_parameter_attributes.rb
module MultiParameterAttributes

  def time(attributes, name)
     attrs = attributes.collect do |key, value|
       if key =~ /^#{Regexp.escape(name.to_s)}\((\d+)(\w)\)$/
         [$1.to_i, value.send("to_#$2")]
       end
     end.compact.sort_by(&:first).map(&:last)
     Time.zone.local(*attrs) unless attrs.empty?
  end

end

# spec/lib/multi_parameter_attributes_spec.rb
describe MultiParameterAttributes do
  include MultiParameterAttributes

  describe "#time" do

    context "when attributes are not in order" do

      before do
        @attributes = {
          "rescheduled_at(3i)" => "6",
          "rescheduled_at(1i)" => "2009",
          "rescheduled_at(4i)" => "09",
          "rescheduled_at(5i)" => "44",
          "rescheduled_at(2i)" => "10",
        }
      end

      it "returns a time for the specified attributes" do
        time(@attributes, "rescheduled_at").should == Time.zone.local(2009, 10, 6, 9, 44)
      end

    end

  end

end