Remove particular XML tag with Nokogiri

Suppose that we have XML -

xml_content = <?xml version="1.0"?>
     <book>
        <author>Gambardella, Matthew</author>
        <title>XML Developer's Guide</title>
        <genre>Computer</genre>
        <price>44.95</price>
        <publish_date>2000-10-01</publish_date>
        <description>An in-depth look at creating applications 
        with XML.</description>
     </book>

And we need to remove <genre> tag but keep the inside that tag -

 <?xml version="1.0"?>
    <book>
       <author>Gambardella, Matthew</author>
       <title>XML Developer's Guide</title>
       Computer
       <price>44.95</price>
       <publish_date>2000-10-01</publish_date>
       <description>An in-depth look at creating applications 
       with XML.</description>
    </book>

We can achieve this with Nokogiri -

 
require 'nokogiri'
doc = Nokogiri::XML 'xml_content'
doc.xpath('//genre').each do |tag|
  tag.replace(Nokogiri::XML::Text.new(tag.text, tag.document))
end
doc.inner_html