Rails - Mar 2007 - How to define relationship for user-to-user friendship

Was wondering how I would define this relationship in my User model if:
A friendship relationship consists of two users.

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Jesse wrote:
> Was wondering how I would define this relationship in my User model if:
> A friendship relationship consists of two users. 
class CreateUsers < ActiveRecord::Migration
   def self.up
     create_table :users do |t|
       t.column :name, :string, :limit => 80, :null => false
       t.column :friend_id, :integer
     end
   end

   def self.down
     drop_table :users
   end
end


class User < ActiveRecord::Base

   belongs_to :friend,
              :class_name => "User",
              :foreign_key => "friend_id"

end


[276]script/console
Loading development environment.
 >> john = User.create(:id => 1, :name => "John")
 >> jane = User.create(:id => 2, :name => "Jane")
 >> john.friend = jane
 >> jane.friend = john
 >> john.friend_id
=> 2
 >> jane.friend_id
=> 1


-- 
Michael Wang

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Jesse wrote:
> Was wondering how I would define this relationship in my User model if:
> A friendship relationship consists of two users.
You''ll want to set up a self-referential many-to-many relationship. 
For
that you''ll need two models, User and Friendship (the join model). You 
can base it on the example I show in this article:

http://blog.hasmanythrough.com/2006/4/21/self-referential-through

Map Node to User, Edge to Friendship. Change the association names as 
makes sense for your models. You may also want to read this article:

http://blog.hasmanythrough.com/2006/8/19/magic-join-model-creation

--
Josh Susser
http://blog.hasmanythrough.com

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