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Ressourcen:
Quellcode:
[bash]
sudo gem install nokogiri — –with-xml2-include=/usr/local/include/libxml2 –with-xml2-lib=/usr/local/lib
[/bash]
[ruby]
# nokogiri_test.rb
require ‚rubygems‘
require ’nokogiri‘
require ‚open-uri‘
url = "http://www.walmart.com/search/search-ng.do?search_constraint=0&ic=48_0&search_query=batman&Find.x=0&Find.y=0&Find=Find"
doc = Nokogiri::HTML(open(url))
puts doc.at_css("title").text
doc.css(".item").each do |item|
title = item.at_css(".prodLink").text
price = item.at_css(".PriceCompare .BodyS, .PriceXLBold").text[/$[0-9.]+/]
puts "#{title} – #{price}"
puts item.at_css(".prodLink")[:href]
end
# lib/tasks/product_prices.rake
desc "Fetch product prices"
task :fetch_prices => :environment do
require ’nokogiri‘
require ‚open-uri‘
Product.find_all_by_price(nil).each do |product|
url = "http://www.walmart.com/search/search-ng.do?search_constraint=0&ic=48_0&search_query=#{CGI.escape(product.name)}&Find.x=0&Find.y=0&Find=Find"
doc = Nokogiri::HTML(open(url))
price = doc.at_css(".PriceCompare .BodyS, .PriceXLBold").text[/[0-9.]+/]
product.update_attribute(:price, price)
end
end
[/ruby]