Nokogiri::XML not creating xml document - ruby-on-rails

Question

Alright, so the ultimate goal here is to parse the data inside of an xml response. The response comes in the format of a ruby string. The problem is that I'm getting an error when creating the xml file from that string (I know for a fact that response.body.to_s is a valid string of xml:
<?xml version="1.0" encoding="UTF-8"?>
<Response>
<CardTxn>
<authcode>123</authcode>
<card_scheme>Mastercard</card_scheme>
<country>United Kingdom</country>
</CardTxn>
<datacash_reference>XXXX</datacash_reference>
<merchantreference>XX0001</merchantreference>
<mode>TEST</mode>
<reason>ACCEPTED</reason>
<status>1</status>
<time>1286477267</time>
</Response>
Inside the ruby method I try to generate an xml file:
doc = Nokogiri::XML(response.body.to_s)
the output of doc.to_s after the above code executes is:
<?xml version="1.0"?>
Any ideas why the file is not getting generated correctly?

Answer 1

This works for me on 1.9.2. Notice it's Nokogiri::XML.parse().
require 'nokogiri'
asdf = %q{<?xml version="1.0" encoding="UTF-8"?>
<Response>
<CardTxn>
<authcode>123</authcode>
<card_scheme>Mastercard</card_scheme>
<country>United Kingdom</country>
</CardTxn>
<datacash_reference>XXXX</datacash_reference>
<merchantreference>XX0001</merchantreference>
<mode>TEST</mode>
<reason>ACCEPTED</reason>
<status>1</status>
<time>1286477267</time>
</Response>
}
doc = Nokogiri::XML.parse(asdf)
print doc.to_s
This parses the XML into a Nokogiri XML document, but doesn't create a file. doc.to_s only shows you what it would be like if you printed it.
To create a file replace "print doc.to_s" with
File.open('xml.out', 'w') do |fo|
fo.print doc.to_s
end