ruby - Nokogiri and XML Formatting When Inserting Tags -

i'd use nokogiri insert nodes xml document. nokogiri uses nokogiri::xml::builder class insert or create new xml.

if create xml using new method, i'm able create nice, formatted xml:

builder = nokogiri::xml::builder.new |xml|   xml.product {     xml.test "hi"   } end  puts builder 

outputs following:

<?xml version="1.0"?> <product>   <test>hi</test> </product>        

that's great, but want add above xml existing document, not create new document. according nokogiri documentation, can done using builder's with method, so:

builder = nokogiri::xml::builder.with(document.at('products')) |xml|   xml.product {     xml.test "hi"   } end  puts builder 

when this, however, xml gets put single line no indentation. looks this:

<products><product><test>hi</test></product></products> 

am missing format correctly?

found answer in nokogiri mailing list:

in xml, whitespace can considered meaningful. if parse document contains whitespace nodes, libxml2 assume whitespace nodes meaningful , not insert them you.

you can tell libxml2 whitespace not meaningful passing "noblanks" flag parser. demonstrate, here example reproduces error, want:

require 'nokogiri' def build_from node   builder = nokogiri::xml::builder.with(node) do|xml|     xml.hello       xml.world     end   end end  xml = data.read doc = nokogiri::xml(xml) puts build_from(doc.at('bar')).to_xml doc = nokogiri::xml(xml) { |x| x.noblanks } puts build_from(doc.at('bar')).to_xml 

output:

<root>   <foo>     <bar>       <baz />     </bar>   </foo> </root>