non-"table_id" foreign key

Okay folks, I'm feeling like a fool. I'm sure I'm not the first person
to run into this, but I can't find the necessary info.

Basically I need to create two tables. The first to hold actual
content. And the second to link pairs of content records. For
example, a "persons" table and a "friends" table that pairs up two
person records. Obviously, I can't have two fields in the friends
table named 'person_id'. So how do I assign a field as a foreign key,
that isn't named in the default format "table_id"?

your table friends:

has
left_person_id
right_person_id

so
class Friend

...

  belongs_to :right_person, :class_name => 'Person', :foreign_key =>
'right_person_id'
  belongs_to :left_person, :class_name => 'Person', :foreign_key =>
'left_person_id'

check out this article and the comments to it, someone did exactly
something like this...

http://blog.hasmanythrough.com/articles/2006/04/21/self-referential-through

igotimac, Thorsten L, & Bryan - Thank you all so much! You'll ROCK!