Undefined method NoMethodError - Beginner question

[Polly Gannaway]

Hi there

I'm a rookie and have no idea where to start on this. I'm using Nokogiri to work with some quite 'messy' HTML. I wrote a method to tidy up the messy strings, and it worked fine on its own. But then when I run the whole program, including Nokogiri parsing of the original HTML, I get the following error:

kamer.rb:9:in `normalise_instrumentation': undefined method `split' for #<Nokogiri::XML::NodeSet:0x007f92cb93bfb0> (NoMethodError)

Can anyone explain why this is happening? And suggest a way to stop it??

Thanks so much

Polly

Here is the code:

require 'nokogiri'

require 'open-uri'

def normalise_instrumentation(instrumentation)

messy_array = instrumentation.split('.')

normal_array = []

messy_array.each do |section|

if section =~ /\A\d+\z/

normal_array << section

end

end

return normal_array

end

doc = Nokogiri::HTML(open('http://www.cs.vu.nl/~rutger/vuko/nl/lijst_van_ooit/complete-solo.html'))

table = doc.css('table[summary=works] tr')

work_value = []

work_hash = {}

table.each do |row|

piece = [row.css('td[1]'), row.css('td[2]'), row.css('td[3]')].map { |r|

r.text.strip!

}

work_value = work_value.push(piece)

work_key = normalise_instrumentation(row.css('td[3]'))

work_hash[work_key] = work_value

end

puts work_hash

[Jack Royal-Gordon]

Hi Polly,

I’m guessing that you are trying to use “split” on some text that you extract from an HTML element. If the TD represents that element, add “.content” to the end of the CSS call, as in the following:

piece = [row.css('td[1]’).content, row.css('td[2]’).content, row.css('td[3]’).content].map { |r|

The important thing to remember is that CSS returns a Nokogiri object (representing, in this case, the TD element) and content() returns the text within that element. Also note that if the TD includes additional elements (e.g. div, span, p, etc) the text from within those elements is also part of the content of the TD element.

Hope this helps.

Jack

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