How do I do reflexive self-join relationships in ActiveRecord?

I'm trying to implement a social networking style friendship model and I didnt have much much luck trying to figure out the plugins available out there. I think I'll learn Rails better if I do it myself. So here's what I have : ``` class User < ActiveRecord::Base has_many :invitee_friendships , :foreign_key => :friend_id, :class_name => 'Friendship' has_many :inviter_friends, :through => :invitee_friendships has_many :inviter_friendships , :foreign_key => :user_id, :class_name => 'Friendship' has_many :invited_friends, :through => :inviter_friendships end class Friendship < ActiveRecord::Base belongs_to :user //I think something needs to come here, i dont know what end ``` In `irb` when I try this: ``` friend1 = Friend.create(:name => 'Jack') friend2 = Friend.create(:name => 'John') bff = Friendship.create(:user_id =>1, :friend_id => 2) f1.invited_friends ``` I get an error: ``` ActiveRecord::HasManyThroughSourceAssociationNotFoundError: Could not find the source association(s) :invited_friend or :invited_friends in model Friendship. Try 'has_many :invited_friends, :through => :invited_friendships, :source => <name>'. Is it one of :user? ``` Expanation of friendship system: - A user can invite other users to become friends. - Users who you invited to become friends are represented by `invited_friends`. - Users who invited you to become friends are represented by `inviter_friends`. - Your total friend list is represented by `invited_friends` + `inviter_friends`. Schema ``` table Friendship t.integer :user_id t.integer :friend_id t.boolean :invite_accepted t.timestamps table User t.string :name t.string :description ```