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I'm using Ruby to read an XML document and update a single node, if it exists, with a new value.
http://www.nokogiri.org/tutorials/modifying_an_html_xml_document.html is not obvious to me how to change the node data, let alone how to save it back to the file.
def ammend_parent_xml(folder, target_file, new_file)
# open parent XML file that contains file reference
get_xml_files = Dir.glob("#{@target_folder}/#{folder}/*.xml").sort.select {|f| !File.directory? f}
get_xml_files.each { |xml|
f = File.open(xml)
# Use Nokgiri to read the file into an XML object
doc = Nokogiri::XML(f)
filename = doc.xpath('//Route//To//Node//FileName')
filename.each_with_index {
|fl, i|
if target_file == fl.text
# we found the file, now rename it to new_file
# ???????
end
}
}
end
This is some example XML:
<?xml version="1.0" encoding="utf-8">
<my_id>123</my_id>
<Route>
<To>
<Node>
<Filename>file1.txt</Filename>
<Filename>file2.mp3</Filename>
<Filename>file3.doc</Filename>
<Filename>file4.php</Filename>
<Filename>file5.jpg</Filename>
</Node>
</To>
</Route>
</xml>
I want to change "file3.doc" to "file3_new.html".
I would call:
def ammend_parent_xml("folder_location", "file3.doc", "file3_new.html")
597
To change an element in the XML:
@doc = Nokogiri::XML::DocumentFragment.parse <<-EOXML
<body>
<h1>OLD_CONTENT</h1>
<div>blah</div>
</body>
EOXML
h1 = @doc.at_xpath "body/h1"
h1.content = "NEW_CONTENT"
puts @doc.to_xml #h1 will be NEW_CONTENT
To save the XML:
file = File.new("xml_file.xml", "wb")
file.write(@doc)
file.close
There's a few things wrong with your sample XML.
my_id and Route
? in the first tag</xml>?After fixing the sample I was able to get the element by using the example by Phrogz:
element = @doc.xpath("Route//To//Node//Filename[.='#{target_file}']").first
Note .first since it will return a NodeSet.
Then I would update the content with:
element.content = "foobar"
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