Rails - Dec 2006 - friendship models

I implemented a friendship model like Flickr''s where you can have a
friend that doesn''t call you a friend... I used Josh Susser''s
self-referential model
(http://blog.hasmanythrough.com/articles/2006/04/21/self-referential-through).

I want to change to the myspace model where two people are either both
friends, or not at all.

Are there any examples out there that implement it this way?

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There is an example of such self-referential joins and rules in
Fowler''s
"Rails Recipes."

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