extensions.rb

class Object

  # with this method you can call stuffs like this Comment.nested_send(:creator, :login)
  # it's the same of Comment.creator.login without the need of checking the absense of creator like:
  # Comment.creator && Comment.creator.login
  def nested_send(*methods)
    obj = self
    methods.each do |e|
      case e
        when Array
          if e.size > 1
            obj = obj.send(e.first, *e[1..-1]) if obj.respond_to?(e.first)
          else
            obj = obj.send(e.first) if obj.respond_to?(e.first)
          end
        when Symbol
          obj = obj.send(e) if obj.respond_to?(e)
      end
      return obj if obj.nil?
    end
    obj
  end
end