From: Luke Cowell <lcowell@...>
Date: 2009-04-25T09:40:31+09:00
Subject: Re: Finding Quiz Responses (#200)

It's late, but it's here.. my very first ruby quiz submission:

#!/usr/bin/env ruby

require 'rubygems'
require 'hpricot'
require 'open-uri'
require 'cgi'

def build_quiz_uri(quiz_num)
  query = CGI::escape("subject:(+#{quiz_num}) +quiz")
  base_url = "http://www.ruby-forum.com/search?query="
  uri_string = (base_url + query)
  URI.parse(uri_string)
end

def get_quiz_response_url(uri_string)
  doc = Hpricot(open(uri_string))
  quiz_table = doc.at("table[@class='topics list]")
  quizzes = quiz_table.search("tr[@class$='new-posts ']")

  highest_replies = 0
  link = ""

  #find the quiz that has the right subject and has the most replies
  quizzes.each do |quiz|
    subject = quiz.at("td[@class='subject']/a").innerHTML
    quiz_subject = "#" + Quiz_num.to_s

    if(subject.include?(quiz_subject))
      replies = quiz.at("td[@class='replies']").innerHTML.to_i
      if(replies > highest_replies)
        highest_replies = replies
        link = quiz.at("td[@class='subject']/a")[:href]
      end
    end
  end

  #trim the excess anchor
  link.gsub(/#.*$/, "")
end

def get_responses(url)
  doc = Hpricot(open(url))

  response_elements = doc.search(".post")

  responses = []

  response_elements.inject([]) do |responses, response|
    link = url + response.search("div[@class='subject]").at("a")[:href]
    author = 
response.search("span[@class]='name'").text.split("(").first.strip
    responses << {:link => link, :author => author}
  end

  #remove the first quiz (which is from the quizmaster)
  responses.delete_at(0)

  #if the summary has been posted, we want to remove that too
  #it's difficult to know if we should actually remove the response...
  if(responses.length > 0)
    if(QuizMaster_Name.include?(responses.last[:author]))
      responses.pop
    end
  end

  responses
end



Quiz_num = 100
QuizMaster_Name = ["Di Mo", "James Gray"]

query_uri = build_quiz_uri(Quiz_num)

response_path = get_quiz_response_url(query_uri)

response_url = query_uri.scheme + "://" + query_uri.host + response_path

puts get_responses(response_url).to_yaml
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