Rails - Dec 2005 - Polymorphic many to many linking

Hi,

I''m trying to create a model where a few objects can all be linked to
each other through a central linking table. Table structure is like
this:

-- model class Computer
create table computers (
  id serial,
  description varchar
);

-- model Class user
create table users (
  id serial,
  name varchar
);

-- model class Desk
create table desks (
  id serial,
  location varchar
);

-- The linking table
create table linkings (
  source_id int,
  source_type varchar,
  link_id int,
  link_type varchar,
  created_at timestamp,
  comments varchar
)

I want to use has_many / belongs_to or some other association to be
able to have any number of objects from different types linked to each
object. I don''t want to create multiple linkings tables for that, as
the more objects I have the increase in number of tables will be huge.

Any way to cleanly solve this?

I tried also with the latest edge with the new polymorphic relations,
but still can''t get it to do work this way.

Thanks,

Guy.