在 Ruby 中使用 Nokogiri 抓取特定标题

Question

I'm currently practicing web scraping using the NYT Best Sellers website. I want to get the title of the #1 book on the list and found the HTML element:

<div class="book-body">
  <p class="freshness">12 weeks on the list</p>
  <h3 class="title" itemprop="name">CRAZY RICH ASIANS</h3>
  <p class="author" itemprop="author">by Kevin Kwan</p>
  <p itemprop="description" class="description">A New Yorker gets a surprise when she spends the summer with her boyfriend in Singapore.</p>
</div>

I'm using the following code to grab the specific text:

doc.css(".title").text

However, it returns the titles of every book on the list. How would I go about getting just the specific book title, "CRAZY RICH ASIANS"?

Answer 1

If you look at the return from doc.css(".title") you will see it is a collection of all the titles. As Nokogiri::XML::Element Objects

CSS to my knowledge does not have a selector for targeting the first element of a given class. (Someone may certainly correct me if I am wrong) but to get just the first element from a Nokogiri::XML::NodeSet is still very simple as it acts like an Array in many cases. For Example:

doc.css(".title")[0].text

You could also use xpath to select just the first one (since XPath does support index based selection) like so:

doc.xpath(doc.xpath("(//h3[@class='title'])[1]").text

Please Note:

• Ruby indexes start at 0 as in the first example;
• XPath indexes start at 1 as in the second example.