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我正在尝试解析我以前的高中橄榄球队的日程安排。

我已经设法获取包含每个游戏日期的节点，但是当我尝试将其转换为 Ruby 日期对象时，我得到一个无效的日期错误。但是，当我将生成的日期复制并粘贴puts gamedate到脚本中以进行测试时，它会很好地转换为日期对象。

gamedate传递to的字符串strptime并将其作为硬编码输入粘贴有什么区别？

require 'rubygems'
require 'nokogiri'
require 'open-uri'
url = "http://www.maxpreps.com/high-schools/fitzgerald-hurricanes-(fitzgerald,ga)/football/schedule.htm"
doc = Nokogiri::HTML(open(url))
games = doc.css('.dual-contest')
games.each do |game|
  puts gamedate = game.css(".event-date").xpath('@title').to_s
  #works
  puts date = DateTime.strptime('2013-08-24T02:30:00','%Y-%m-%dT%H:%M:%S')
  #does not work
  puts date = DateTime.strptime(gamedate,'%Y-%m-%dT%H:%M:%S')
end
4

1 回答 1

1

看原因：

require 'rubygems'
require 'nokogiri'
require 'open-uri'
url = "http://www.maxpreps.com/high-schools/fitzgerald-hurricanes-(fitzgerald,ga)/football/schedule.htm"
doc = Nokogiri::HTML(open(url))
games = doc.css('.dual-contest')
games.each do |game|
  puts gamedate = game.css(".event-date").xpath('@title').empty?
end

# >> true
# >> false
# >> false
# >> false
# >> false
# >> false
# >> false
# >> false
# >> false
# >> false
# >> false

换一种方式看，有一个表数据，它具有nil价值：

require 'rubygems'
require 'nokogiri'
require 'open-uri'
url = "http://www.maxpreps.com/high-schools/fitzgerald-hurricanes-(fitzgerald,ga)/football/schedule.htm"
doc = Nokogiri::HTML(open(url))
games = doc.at_css('.dual-contest').at_css(".event-date").at_xpath('@title')
puts games
# ~> -:6:in `<main>': undefined method `at_xpath' for nil:NilClass (NoMethodError)

我会这样：-

require 'rubygems'
require 'nokogiri'
require 'open-uri'

url = "http://www.maxpreps.com/high-schools/fitzgerald-hurricanes-(fitzgerald,ga)/football/schedule.htm"
doc = Nokogiri::HTML(open(url))
doc.css('#schedule .event-date').each do |nd|
  dt = nd['title']
  p dt,DateTime.parse(dt)
end
# >> "2013-08-24T02:30:00"
# >> #<DateTime: 2013-08-24T02:30:00+00:00 ((2456529j,9000s,0n),+0s,2299161j)>
# >> "2013-09-07T02:30:00"
# >> #<DateTime: 2013-09-07T02:30:00+00:00 ((2456543j,9000s,0n),+0s,2299161j)>
# >> "2013-09-14T02:30:00"
# >> #<DateTime: 2013-09-14T02:30:00+00:00 ((2456550j,9000s,0n),+0s,2299161j)>
# >> "2013-09-21T02:30:00"
# >> #<DateTime: 2013-09-21T02:30:00+00:00 ((2456557j,9000s,0n),+0s,2299161j)>
# >> "2013-09-28T02:30:00"
# >> #<DateTime: 2013-09-28T02:30:00+00:00 ((2456564j,9000s,0n),+0s,2299161j)>
# >> "2013-10-05T02:30:00"
# >> #<DateTime: 2013-10-05T02:30:00+00:00 ((2456571j,9000s,0n),+0s,2299161j)>
# >> "2013-10-12T02:30:00"
# >> #<DateTime: 2013-10-12T02:30:00+00:00 ((2456578j,9000s,0n),+0s,2299161j)>
# >> "2013-10-19T02:30:00"
# >> #<DateTime: 2013-10-19T02:30:00+00:00 ((2456585j,9000s,0n),+0s,2299161j)>
# >> "2013-10-26T02:30:00"
# >> #<DateTime: 2013-10-26T02:30:00+00:00 ((2456592j,9000s,0n),+0s,2299161j)>
# >> "2013-11-02T02:30:00"
# >> #<DateTime: 2013-11-02T02:30:00+00:00 ((2456599j,9000s,0n),+0s,2299161j)>
于 2013-07-28T17:48:11.317 回答