SpaceApps Challenges ruby scraper

spaceapps_scraper.rb

# gem install nokogiri

require 'nokogiri'
require 'open-uri'

base_uri = "https://2014.spaceappschallenge.org/"
category_links = Nokogiri::HTML(open("#{base_uri}/challenge")).css('#category_array a').map {|l| l.attributes['href'].text}
categories = category_links.map {|cat| cat.split('/').last}
category_hashes = {}
category_links.each_with_index do |link, index|
  category = categories[index]
  challenge_links = Nokogiri::HTML(open("#{base_uri}#{link}")).css('#challenge_array a').map {|l| l.attributes['href'].text}
  category_hashes.merge!({category => {links: challenge_links} })
  category_challenges = []
  challenge_links.each do |challenge_link|
    challange_html = Nokogiri::HTML(open("#{base_uri}#{challenge_link}"))
    challenge_name = challange_html.at_css('h2').text
    challenge_text = challange_html.at_css('#descriptionTab').inner_html
    category_challenges << {challenge_name => challenge_text}
  end
  category_hashes[category][:challenges]=category_challenges
end