Ruby: Parse Nokogiri XML-node to Ruby Hash instance

nokogiri_xml_to_hash.rb

nokogiri_xml_to_hash = lambda do |node|
  out_hash = {}
  return out_hash if node.nil?

  node.attributes.each { |k,_| out_hash[k] = node.attr(k) }

  node.elements.try(:each) do |elem|
    prop = nokogiri_xml_to_hash(elem)

    if prop.is_a?(Array) && prop.size > 1
      out_hash[elem.name] = prop
    else
      out_hash[elem.name] ||= []
      out_hash[elem.name].push(prop)
    end

    out_hash[elem.name].flatten!
  end

  return out_hash.values.flatten if out_hash.size < 2

  out_hash
end

It can be used as a method of Nokogiri element (not recommended):

module Nokogiri
  module XML
    class Element
      def to_hash
        out_hash = {}

        attributes.each { |k,_| out_hash[k] = attr(k) }

        elements.try(:each) do |elem|
          prop = nokogiri_xml_to_hash(elem)

          if prop.is_a?(Array) && prop.size > 1
            out_hash[elem.name] = prop
          else
            out_hash[elem.name] ||= []
            out_hash[elem.name].push(prop)
          end

          out_hash[elem.name].flatten!
        end

        return out_hash.values.flatten if out_hash.size < 2

        out_hash
      end
    end
  end
end