ruby - Nokogiri: copy node and add new parent to copy? -

any idea how copy node , give new parent, goal of writing copy new file?

i've noticed when reassign 1 node another's parent, nothing happens. example,

doc.xpath("/child").each do|child|    # copy node new structure. tried dup()   copyofchild = child    # create new node become newdoc's parent   mom = nokogiri::xml::node.new('mom', copyofchild)    copyofchild.parent = mom    puts copyofchild  # lists <child>...</child>, not <mom><child>...</child></mom>    # write newdoc file...    end 

the 1 example on docs page shows analogous working, although they're reassigning 1 item in structure parent of item in same structure.

thanks!

starting this:

require 'nokogiri'  xml = '<xml><bar>text</bar></xml>' doc = nokogiri::xml(xml)  bar = doc.at('bar') bar.parent.children = '<foo>' + bar.to_xml + '</foo>' puts doc.to_xml 

which looks like:

<?xml version="1.0"?> <xml>   <foo>     <bar>text</bar>   </foo> </xml> 

alternately, can like:

bar = doc.at('bar') bar.replace('<foo>' + bar.to_xml + '</foo>') 

part of problem in code xpath accessor:

"/child" 

doesn't think. finds top-level <child> node, not 1 farther in tree. in example xml it'd equivalent <xml> node. perhaps want //child finds <child> nodes throughout document.

personally, prefer css accessors on xpath. both nicely supported nokogiri, , both make things easier other, it's familiar both.