Add support for querying for people and adding notifications to messages.

basecamp.rb

module Basecamp
  class Message
    attr_accessor :notify

    def to_xml(arg={})
      # Little heavy handed but...it does the trick.
      doc = Nokogiri::XML(super(arg))

      # This doesn't create a "request" element by default, so lets
      # create one.
      request = doc.create_element('request')

      # Move the <post/> element in to the request element...
      request.add_child(doc.children.find { |n| n.name.eql?('post') })

      # Add all the notification thingers...
      notify.each do |n|
        if n.is_a? Basecamp::Person
          id = n.id
        else
          id = n
        end

        request.add_child(doc.create_element('notify', id.to_s))
      end

      # Stick it back in the doc...and thunk back to a string.
      doc.add_child(request)
      doc.to_s
    end

    def notify
      @notify ||= []
    end
  end

  class Project
    def people
      get(:people).map { |h| Basecamp::Person.new(h) }
    end
  end
end