使用 Kimurai 进行网页抓取 gem

Question

我正在使用 Kimurai Ruby gem 进行一些网络抓取。我有这个脚本，效果很好：

require 'kimurai'

class SimpleSpider < Kimurai::Base
  @name = "simple_spider"
  @engine = :selenium_chrome
  @start_urls = ["https://apply.workable.com/taxjar/"]

  def parse(response, url:, data: {})
    # Update response to current response after interaction with a browser
    count = 0
    # browser.click_button "Show more"
    doc = browser.current_response
    returned_jobs = doc.css('.careers-jobs-list-styles__jobsList--3_v12')
    returned_jobs.css('li').each do |char_element|
        # puts char_element
        title = char_element.css('a')[0]['aria-label']
        link = "https://apply.workable.com" + char_element.css('a')[0]['href']

        #click on job link and get description
        browser.visit(link)
        job_page = browser.current_response
        description = job_page.xpath('/html/body/div[1]/div/div[1]/div[2]/div[2]/div[2]').text

        puts '*******'
        puts title
      puts link
        puts description
        puts count += 1
    end
    puts "There are #{count} jobs total"
  end
end

SimpleSpider.crawl!

但是，我希望这一切都成为 return 一组对象……在本例中为作业。我想在 parse 方法中创建一个 jobs 数组，并在 returned_jobs 循环中做类似 jobs << [title, link, description, company] 的事情，并在我调用 SimpleSpider.crawl! 时得到 returned 但那不起作用。

感谢任何帮助。

Answer 1

您可以像这样稍微修改您的代码：

class SimpleSpider < Kimurai::Base
  @name = "simple_spider"
  @engine = :selenium_chrome
  @start_urls = ["https://apply.workable.com/taxjar/"]

  def parse(response, url:, data: {})
    # Update response to current response after interaction with a browser
    count = 0
    # browser.click_button "Show more"
    doc = browser.current_response
    returned_jobs = doc.css('.careers-jobs-list-styles__jobsList--3_v12')

    jobs = []
    returned_jobs.css('li').each do |char_element|
        # puts char_element
        title = char_element.css('a')[0]['aria-label']
        link = "https://apply.workable.com" + char_element.css('a')[0]['href']

        #click on job link and get description
        browser.visit(link)
        job_page = browser.current_response
        description = job_page.xpath('/html/body/div[1]/div/div[1]/div[2]/div[2]/div[2]').text

        jobs << [title, link, description]
    end

    puts "There are #{jobs.count} jobs total"
    puts jobs
  end
end

我不确定公司的情况，因为我在您的代码中没有看到该变量。但是，您可以在上面看到调用数组并对其进行处理的想法。

这是终端中输出运行的一部分：

我还有一个博客 post here 关于如何在 Rails 应用程序上使用 Ruby 的 Kimurai 框架。

Answer 2

原来有一个 parse method 允许返回一个值。这是工作示例：

require 'open-uri'
require 'nokogiri'
require 'kimurai'

class TaxJar < Kimurai::Base
  @name = "tax_jar"
  @engine = :selenium_chrome
  @start_urls = ["https://apply.workable.com/taxjar/"]

  def parse(response, url:, data: {})
  jobs = Array.new

    doc = browser.current_response
    returned_jobs = doc.css('.careers-jobs-list-styles__jobsList--3_v12')
    returned_jobs.css('li').each do |char_element|
      title = char_element.css('a')[0]['aria-label']
      link = "https://apply.workable.com" + char_element.css('a')[0]['href']

      #click on job link and get description
      browser.visit(link)
      job_page = browser.current_response
      description = job_page.xpath('/html/body/div[1]/div/div[1]/div[2]/div[2]/div[2]').text
      company = 'TaxJar'
      puts "title is: #{title}, link is: #{link}, \n description is: #{description}"
      jobs << [title, link, description, company]
    end
    return jobs
  end
end

jobs = TaxJar.parse!(:parse, url: "https://apply.workable.com/taxjar/")
puts jobs.inspect

如果你正在抓取 JS 网站，这个 gem 与我试过的其他 (waitr/selenium) 相比似乎相当强大。

使用 Kimurai 进行网页抓取 gem

Web scraping with Kimurai gem

ruby

web-scraping

kimurai