Difficulty screen scraping http://www.momondo.com using nokogiri

Posted by Khai Kiong on Stack Overflow See other posts from Stack Overflow or by Khai Kiong
Published on 2012-11-25T14:09:50Z Indexed on 2012/11/25 17:04 UTC
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ruby-on-rails

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nokogiri

I have some difficulty to extract the total price (css selector = '.total') from the flight result.

http://www.momondo.com/multicity/?Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false#Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false

I get the error "undefined method `text' for nil:NilClass nokogiri ".

My code

desc "Fetch product prices"
task :fetch_details => :environment do
  require 'nokogiri'
  require 'open-uri'
  include ERB::Util

  OneWayFlight.find_all_by_money(nil).each do |flight|
    url = "http://www.momondo.com/multicity/Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false#Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false"
    doc = Nokogiri::HTML(open(url))
    price = doc.at_css(".total").text[/[0-9\.]+/]
    flight.update_attribute(:price, price)
  end
end

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