1
이 코드는 완전히 손상되었습니다.Variable에 값을 할당 할 수 없습니다 : 정의되지 않은 메소드`[] 'for nil : NilClass (NoMethodError)
나는 다음과 같은 코드가 있습니다
puts block.at_xpath("*/img")["width"].to_i
을하지만
width = block.at_xpath("*/img")["width"].to_i
로 변경할 때이 오류 얻을 : 내가 거기에 박았을 때
NokogiriTUT.rb:70:in `blockProcessor': undefined method `[]' for nil:NilClass (NoMethodError)
그것을 기대 값을 반환합니다.
업데이트 : 여기
def blockProcessor(block)
header = block.xpath('td[@class="default"]/*/span[@class="comhead"]')
array = header.text.split
if array[0] != nil #checks to make sure we aren't at the top of the parent list
### Date and Time ###
if array[2] == 'hours' || array[2] == 'minutes'
date = Time.now
else
days = (array[1].to_i * 24 * 60 * 60)
date = Time.now - days
end
##Get Comment##
comment = block.at_xpath('*/span[@class="comment"]')
hash = comment.text.hash
#puts hash
##Manage Parent Here##
width = block.at_xpath("*/img")["width"].to_i
prevlevel = @parent_array[@parent_array.length-1][1]
if width == 0 #has parents
parentURL = header.xpath('a[@href][3]').to_s
parentURL = parentURL[17..23]
parentURL = "http://news.ycombinator.com/item?id=#{parentURL}"
parentdoc = Nokogiri::HTML(open(parentURL))
a = parentdoc.at_xpath("//html/body/center/table/tr[3]/td/table/tr")
nodeparent = blockProcessor(a)
@parent_array = []
node = [hash, width, nodeparent] #id, level, parent
@parent_array.push node
elsif width > prevlevel
nodeparent = @parent_array[@parent_array.length-1][0]
node = [hash, width, nodeparent]
@parent_array.push node
elsif width == prevlevel
nodeparent = @parent_array[@parent_array.length-1][2]
node = [hash, width, nodeparent]
@parent_array.push node
elsif width < prevlevel
until prevlevel == w do
@parent_array.pop
prevlevel = @parent_array[@parent_array.length-1][1]
end
nodeparent = @parent_array[@parent_array.length-1][2]
node = [hash, width, nodeparent]
@parent_array.push node
end
puts "Author: #{array[0]} with hash #{hash} with parent: #{nodeparent}"
##Handles Any Parents of Existing Comments ##
return hash
end
end
end
는에 역할을하는 블록이다.
<tr>
<td><img src="http://ycombinator.com/images/s.gif" height="1" width="0"></td>
<td valign="top"><center>
<a id="up_3004849" href="vote?for=3004849&dir=up&whence=%2f%78%3f%66%6e%69%64%3d%34%6b%56%68%71%6f%52%4d%38%44"><img src="http://ycombinator.com/images/grayarrow.gif" border="0" vspace="3" hspace="2"></a><span id="down_3004849"></span>
</center></td>
<td class="default">
<div style="margin-top:2px; margin-bottom:-10px; "><span class="comhead"><a href="user?id=patio11">patio11</a> 12 days ago | <a href="item?id=3004849">link</a> | <a href="item?id=3004793">parent</a> | on: <a href="item?id=3004471">Ask HN: What % of your job interviewees pass FizzB...</a></span></div>
<br><span class="comment"><font color="#000000">Every time FizzBuzz problems come up among engineers, people race to solve them and post their answers, then compete to see who can write increasingly more nifty answers for a question which does not seek niftiness at all.<p>I'm all for intellectual gamesmanship, but these are our professional equivalent of a doctor being asked to identify the difference between blood and water. You can do it. <i>We know</i>. Demonstrating that you can do it is not the point of the exercise. We do it to have a cheap-to-administer test to exclude people-who-cannot-actually-program-despite-previous-job-titles from the expensive portions of the hiring process.</p></font></span><p><font size="1"><u><a href="reply?id=3004849&whence=%2f%78%3f%66%6e%69%64%3d%34%6b%56%68%71%6f%52%4d%38%44">reply</a></u></font></p>
</td>
</tr>
at_xpath를 호출하기 전에'puts 블록 '을 추가하려고 했습니까? 어쩌면 당신은'block'을 바꾸는 부작용이있을 수도 있습니다. – knut
@knut, 나는 그저 두번 확인했는데 그 것이 작동합니다. 또한 puts가 내가 기대하고 바라는 가치를 제공한다는 것은 이상한 일입니다. 내가 원하는 것은 그것을 변수에 할당하는 것뿐입니다. –
'width = ...'과제의 문맥은 무엇이고 '공장'은 무엇입니까? –