Ruby edit and save XML file - ruby

Question

I have written some code to transform the name of the audio files (appending 'XX' to the name on this example). The code is working but I don't find a way to save it as a new xml file. I did try all the solutions I found on the forums but still not working;(
This is a piece of my xml file :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xmeml>
<xmeml version="4">
<sequence authoringapp="Storyboard Pro"
projectpath="/Users/rougnaux/Desktop/XML_TEST/man_142_test/man_142_test.sboard"
id="man_142_test">
<media>
<audio>
<track>
<clipitem id="MAN_142_RADIOPLAY - SCRATCH_ESCAPING THE MANOR_20200929">
<file id="MAN_142_RADIOPLAY - SCRATCH_ESCAPING THE MANOR_20200929 1">
<name>MAN_142_RADIOPLAY - SCRATCH_ESCAPING THE MANOR_20200929.wav</name>
</file>
</clipitem>
</track>
</audio>
</media>
<ismasterclip>FALSE</ismasterclip>
</sequence>
</xmeml>
this is my code:
require 'nokogiri'
file = File.read('man_142_test.xml')
document = Nokogiri::XML(file)
document.xpath(("//sequence/media/audio/track/clipitem/file/name")).map {|name|
name.children.text }.map!{ |name| 'XX'+name}
File.open("new_test.xml", "w") do |f|
f.write document.to_xml
end
When I check in irb with puts document, I have this output
["XXMAN_142_RADIOPLAY - SCRATCH_ESCAPING THE MANOR_20200929.wav", "XXchimes 02_1.mp3"]
On the 'new_test.xml' file, the name of the audio tracks are not changed. What is missing here?!

Answer 1

Try the below:
require 'nokogiri'
file = File.read('man_142_test.xml')
document = Nokogiri::XML(file)
document.xpath(("//sequence/media/audio/track/clipitem/file/name")).map do |name|
name.content = 'XX' + name
end
File.open("new_test.xml", "w") do |f|
f.write document.to_xml
end

Answer 2

For those who are facing same kind of problem, here is the way to do it:
require 'nokogiri'
file = File.read('man_142_test.xml')
document = Nokogiri::XML(file)
document.search("//sequence/media/audio/track/clipitem/file/name").each do |node|
node.content = "XX_#{node.content}"
end
File.open("new_test.xml", "w") do |f|
f.write document.to_xml
end
I think xpath and map were the wrong approaches to modify the xml, even though I don't understand yet why I saw them in lots of solutions about editing xml. If someone can give more details about that, I think it could help lots of people like me!