gistfile1.rb

hydra = Typhoeus::Hydra.new(20) # number is the size of the easy object pool

user_request = User.find_request(1) # where 1 is the id of the user
user_request.when_complete do
  @user = User.parse(user_request.response.body)
  comment_requests = @user.comment_ids.map {|id| Comment.find_request(id)}
  comment_requests.each do |comment_request|
    comment_request.when_complete do
      @user.comments << Comment.parse(comment_request.response.body)
    end
    hydra.queue_request(comment_request)
  end
end
hydra.queue_request(user_request)

hydra.run
# now we have a user object with all the comments