Convert Nokogiri Document to Ruby Hash

Question

Is there an easy way to convert a Nokogiri XML document to Hash?

Something like Rails' Hash.from_xml .

Answer 1

I use this code with libxml-ruby (1.1.3). I have not used nokogiri myself, but I understand that it uses libxml-ruby anyway. I would also suggest you take a look at ROXML ( http://github.com/Empact/roxml/tree ), which displays xml elements for ruby ​​objects; it is built on top of libxml.

 # USAGE: Hash.from_libxml(YOUR_XML_STRING) require 'xml/libxml' # adapted from # http://movesonrails.com/articles/2008/02/25/libxml-for-active-resource-2-0 class Hash class << self def from_libxml(xml, strict=true) begin XML.default_load_external_dtd = false XML.default_pedantic_parser = strict result = XML::Parser.string(xml).parse return { result.root.name.to_s => xml_node_to_hash(result.root)} rescue Exception => e # raise your custom exception here end end def xml_node_to_hash(node) # If we are at the root of the document, start the hash if node.element? if node.children? result_hash = {} node.each_child do |child| result = xml_node_to_hash(child) if child.name == "text" if !child.next? and !child.prev? return result end elsif result_hash[child.name.to_sym] if result_hash[child.name.to_sym].is_a?(Object::Array) result_hash[child.name.to_sym] << result else result_hash[child.name.to_sym] = [result_hash[child.name.to_sym]] << result end else result_hash[child.name.to_sym] = result end end return result_hash else return nil end else return node.content.to_s end end end end 

Answer 2

If you want to convert the Nokogiri XML document to a hash, follow these steps:

 require 'active_support/core_ext/hash/conversions' hash = Hash.from_xml(nokogiri_document.to_s) 

Answer 3

Here's a much simpler version that creates a reliable hash that includes namespace information for both elements and attributes:

 require 'nokogiri' class Nokogiri::XML::Node TYPENAMES = {1=>'element',2=>'attribute',3=>'text',4=>'cdata',8=>'comment'} def to_hash {kind:TYPENAMES[node_type],name:name}.tap do |h| h.merge! nshref:namespace.href, nsprefix:namespace.prefix if namespace h.merge! text:text h.merge! attr:attribute_nodes.map(&:to_hash) if element? h.merge! kids:children.map(&:to_hash) if element? end end end class Nokogiri::XML::Document def to_hash; root.to_hash; end end 

In action:

 xml = '<ra="b" xmlns:z="foo"><z:a>Hello <bz:m="n" x="y">World</b>!</z:a></r>' doc = Nokogiri::XML(xml) p doc.to_hash #=> { #=> :kind=>"element", #=> :name=>"r", #=> :text=>"Hello World!", #=> :attr=>[ #=> { #=> :kind=>"attribute", #=> :name=>"a", #=> :text=>"b" #=> } #=> ], #=> :kids=>[ #=> { #=> :kind=>"element", #=> :name=>"a", #=> :nshref=>"foo", #=> :nsprefix=>"z", #=> :text=>"Hello World!", #=> :attr=>[], #=> :kids=>[ #=> { #=> :kind=>"text", #=> :name=>"text", #=> :text=>"Hello " #=> }, #=> { #=> :kind=>"element", #=> :name=>"b", #=> :text=>"World", #=> :attr=>[ #=> { #=> :kind=>"attribute", #=> :name=>"m", #=> :nshref=>"foo", #=> :nsprefix=>"z", #=> :text=>"n" #=> }, #=> { #=> :kind=>"attribute", #=> :name=>"x", #=> :text=>"y" #=> } #=> ], #=> :kids=>[ #=> { #=> :kind=>"text", #=> :name=>"text", #=> :text=>"World" #=> } #=> ] #=> }, #=> { #=> :kind=>"text", #=> :name=>"text", #=> :text=>"!" #=> } #=> ] #=> } #=> ] #=> } 

Answer 4

I found this while trying to simply convert XML to Hash (not to Rails). I thought I would use Nokogiri, but in the end I went with Nori .

Then my code was a triangle:

 response_hash = Nori.parse(response) 

---

Other users have indicated that this does not work. I did not check, but it seems that the parse method has been moved from class to instance. My code above worked at some point. New (unverified) code:

 response_hash = Nori.new.parse(response) 

Answer 5

Use Nokogiri to parse the XML response to the rubies hash code. This is pretty fast.

 doc = Nokogiri::XML(response_body) Hash.from_xml(doc.to_s) 

Answer 6

If you define something like this in your configuration:

 ActiveSupport::XmlMini.backend = 'Nokogiri' 

it includes the module in Nokogiri, and you get the to_hash method.

Answer 7

If the node that you selected in Nokogiri consists of only one tag, you can extract the keys, values ​​and pin them to a single hash, for example:

  @doc ||= Nokogiri::XML(File.read("myxmldoc.xml")) @node = @doc.at('#uniqueID') # this works if this selects only one node nodeHash = Hash[*@node.keys().zip(@node.values()).flatten] 

For more information on merging the Ruby array, see http://www.ruby-forum.com/topic/125944 .

Answer 8

Take a look at the simple mix I made for the Nokogiri Node XML.

http://github.com/kuroir/Nokogiri-to-Hash

Here is a usage example:

 require 'rubygems' require 'nokogiri' require 'nokogiri_to_hash' html = ' <div id="hello" class="container"> <p>Hello! visit my site <a href="http://kuroir.com">Kuroir.com</a></p> </div> ' p Nokogiri.HTML(html).to_hash => [{:div=>{:class=>["container"], :children=>[{:p=>{:children=>[{:a=>{:href=>["http://kuroir.com"], :children=>[]}}]}}], :id=>["hello"]}}]