Rails - Jul 2006 - self referential xml using builder

Hi listers,

I''m trying to build an xml doc using Builder, but I''m having
trouble
getting it to draw a tree structure from a self-referential table. 
Here''s what I''m after:
=========================---- object structure ----
node      (name => root)
 - node   (name => child 1)
 - node   (name => child 2)
   - node (name => child 2.1)
   - node (name => child 2.2)

-- should become --
<node name="root">
  <node name="child 1" />
  <node name="child 2">
    <node name="child 2.1" />
    <node name="child 22" />
  </node>
</node>
=========================Basically, I''m struggling to contain the
childnodes within their parents
(getting a list of nodes is easy) - the structure is important, and 
needs to be maintained for the parser that is working with this sucker.
I''m trying to keep this DRY, but currently am stuck on something like 
this in the rxml template (which works but is obviously is limited to 2 
levels deep):

  node.children.each do |n|
    xml.node(:name => n.name)
    n.children.each do |c|
      xml.node(:name => c.name)
    end
  end

Any ideas of how to do this cleanly in the template? Or do I need to 
bust out some helper methods to get through this?
thanks,
Dan


-- 
Posted via http://www.ruby-forum.com/.

its a little expensive [correct me if Im wrong but I don''t think ruby 
supports tail-recursion], but you might have to consider recursion esp 
if you have unknown number of subnodes of subnodes, etc.

yea a helper would be in order to sort that out..

-- 
Posted via http://www.ruby-forum.com/.