雅虎财经新闻pubDate不能被红宝石访问

Question

我能够访问雅虎财经新闻标题，但解析 pubDate 很困难，所以我只看上周的新闻，而忽略了任何较老的。

require 'nokogiri'
sym = "1313.HK"
url = "https://feeds.finance.yahoo.com/rss/2.0/headline?s=#{sym}&region=US&lang=en-US"
doc = Nokogiri::HTML(open(url))

titles = doc.css("title")
puts titles.length # works, comes back with 0-20
puts titles.text # works

pubDates = doc.css("pubDate")
puts pubDates.length #does NOT work, always 0
puts pubDates.text #does NOT work, always blank

keywordregex = "bad news"
nodes = doc.search('title') # search title tags only, for keywords
puts found_title = nodes.select{ |n| n.name=='title' && n.text =~ keywordregex } # TODO && pubDate > 7 days old 

Answer 1

尝试使用Nokogiri:: XML，rss实际上是XML。

doc = Nokogiri::XML(open(url))

Answer 2

XML源中的pubdate节点名称是小写的。

 > doc.css("pubdate").length
 => 7