Rails - Aug 2009 - libxml-ruby question

Hi

	This has been driving me nuts for the past hour or two.   I''m hoping
someone here knows the answer.

	I need to be able to dynamically add some nodes to some xml.   The
example below is contrived - but hopefully clear enough so you get the
''picture''

	So - say I have a Foo object and I want to add something to a child
node within Foo''s xml representation before I send the response back
to the user.

	In my controller ...

		def show
			@foo = Foo.find(params[:id])

			 respond_to do |format|
				format.html # show.html.erb
				format.xml { render :xml => extend_foo(@foo.to_xml) }
			 end
		 end

		private

		def extend_foo(xml)

			parser = XML::Parser.new(XML::Parser::Context.string(xml))
			doc = parser.parse

			child_node_xpath = doc.find(" ....  insert funky xpath string
here  ....")

			child_node = child_node_xpath.first

			logger.debug("\n\nbefore ...\n#{child_node.to_s}\n\n")
			# this correctly outputs the contents of the ''child_node''

			child_node << child = XML::Node.new(''new_node'')
   			child[''new_node_attribute''] = ''true''

			logger.debug("\n\nafter ...\n#{child_node.to_s}\n\n")
			# this correctly outputs the contents of the ''child_node'' -
with
the ''new_node'' added (along with the
''new_node_attribute'')

			# NOTE: everything up to here works great.

		end



	The problem is that the updated node is not part of the response sent
to the client.   For lake of a better term - I can''t seem to figure
out how to ''save'' the changed node.

	Any tips/suggestions/pointers would be greatly appreciated.   I''m
using libxml.

Thanks
Dave

On Aug 22, 2:39 am, dekhaus
<dekh...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>         The problem is that the updated node is not part of the response
sent
> to the client.   For lake of a better term - I can''t seem to
figure
> out how to ''save'' the changed node.
Have you tried calling to_s on the document object and returning
that ?

Fred
>
>         Any tips/suggestions/pointers would be greatly appreciated.  
I''m
> using libxml.
>
> Thanks
> Dave