[Rails] how to show a hierarchical list (like Mac Finder/Explorer)

I have a list of Groups with members and sub-groups in an unlimited
depth.

It has the same basic structure as a directory listing in either Mac
Finder or Windoze Explorer where the files a roughly analogous to my
members, and the sub-dirs are analogous to my sub-groups. Just as in
Mac Finder, I would like to have it remember the "open-ness" of the
dirs/sub-dirs in the db so user will see it the same way on subsequent
uses of the app.

Is there some sort of a plugin for displaying this kind of a data set in
Rails?

If not, how would you go about designing this? I'm stuck.

thanks,
jp
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