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 [email protected] 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

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