Rails - May 2010 - Remote ActiveRecord relation (over network)

Hi,

I have a has and belongs to many relation between User and Article
models, and I would like to link them even if an article if not hosted
on the same database then a user.

For example, If an article exists at http://foo.com/articles/3 and a
user exists at http://bar.com/users/1, If would like to be able to do
from http://foo.com web interface or http://bar.com web interface this
kind of query: a_user.articles (or an_article.users).

I think this can be possible adding a field like "url" in users and
articles tables.  But I don''t know how to process for ActiveRecord.  My
Article model looks like this:

class Article < ActiveRecord::Base
  has_and_belongs_to_many :users
end

Is there yet some example of project using this kind of relation over
internet?

Many thanks
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