Rails - Feb 2006 - Need help setting up and iterating thru a tree

Guys,

Newbie here.  Given the following table named Employee_Links:

ID  Emp_ID  Parent_ID
--  ------  ---------
1   200     100
2   300     100
3   300     200
4   400     100
5   500     400
6   500     300

I''d like to be able to generate a tree that looks like this:

100
  |-200
      |-300
          |-500
  |-300
  |-400
      |-500

Note that where 500''s Parent_ID = 300 (row 6), 500 is linked to the 
first 300 it finds in the tree diagram.

After some experimentation, it appears that ACTS_AS_TREE won''t work 
since I have nodes that will have >1 parent node.  Is there a simple way 
to setup the relationship (HABTM?) AND the code that generates the tree 
diagram?  I''ve looked at various similar examples online, and I have
the
new Rails Recipes PDF book, but I haven''t been able to figure this one 
out without writing a lot of code, which I have a feeling is the wrong 
approach.

Help!

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