如何将 Nokogiri 元素分配给哈希键

问：

我正在抓取 Techcrunch.com 并抓取每篇文章的标题、URL 和预览文本。

我有：

require 'nokogiri'
require 'open-uri'

class TestScraper::Scraper
@doc = Nokogiri::HTML(open("https://techcrunch.com")

  def scrape_tech_crunch
    articles = @doc.css("h2.post-block__title").css("a")
    top_stories = articles.each do |story|
      stories = {
        :title => story.children.text.strip,
        :url => story.attribute("href").value,
        :preview => @doc.css("div.post-block__content").children.first.text
      }
      TestScraper::Article.new(stories)
    end
  end
end

TestScraper::Article.new(stories)将哈希作为参数，并使用它来初始化 Article 类：

class TestScraper::Article
  attr_accessor :title, :url, :preview 

  @@all = []

  def initialize(hash)
    hash.each do |k, v|
      self.send "#{k}=", v
    end
    @@all << self
  end

  def self.all
    @@all
  end
end

当我跑步时，我得到：TestScraper::Scraper.new("https://techcrunch.com").scrape_tech_crunch

[#<TestScraper::Article:0x00000000015f69e0
  @preview=
   "\n\t\tSecurity researchers have found dozens of Android apps in the Google Play store serving ads to unsuspecting victims as part of a money-making scheme. ESET researchers found 42 apps conta
ining adware, \t",
  @title=
   "Millions downloaded dozens of Android apps on Google Play infected with adware",
  @url=
   "https://techcrunch.com/2019/10/24/millions-dozens-android-apps-adware/">,
 #<TestScraper::Article:0x00000000015f5658
  @preview=
   "\n\t\tSecurity researchers have found dozens of Android apps in the Google Play store serving ads to unsuspecting victims as part of a money-making scheme. ESET researchers found 42 apps conta
ining adware, \t",
  @title="Netflix launches $4 mobile-only monthly plan in Malaysia",
  @url=
   "https://techcrunch.com/2019/10/24/netflix-malaysia-mobile-only-cheap-plan/">

它为文章类的每个实例创建一个具有相应标题和 URL 的对象，但它会继续为每个文章实例分配相同的预览文本。应该有 20 篇文章，每篇文章都有自己的“预览”（在单击链接阅读全文之前获得的文章的小样本）。