Ruby on Rails

New to RoR, trying to model this correctly (which should be super simple I'd think, but I'm stuck at the moment):

Any given "User" of the app can have a group of "friends" (where friends are also users.) (think typical facebook friends concept.)

I know I should have a 'user_friends' table that has two user_ids as fks to the User table one for the user and the other to hold multiple 'friends'

My first shot is looking like this...

class User < ActiveRecord::Base
  acts_as_authentic
  has_many :user_friends, :dependent => :destroy
  has_many :friends, :class_name => "User", :foreign_key => "friend_id", :through => :user_friends, :dependent => :destroy
end

class UserFriend < ActiveRecord::Base
  belongs_to :user
  belongs_to :user, :class_name => "User", :foreign_key => "friend_id"
end

#migration
class CreateUserFriends < ActiveRecord::Migration
  def self.up
    create_table :user_friends, :id => false do |t|
      t.integer :user_id
      t.integer :friend_id
      t.timestamps
    end
  end

When I run my test, it barfs saying

Failures:
  1) User should create a user and some friends
     Failure/Error: user.friends << f1 << f2
     Could not find the source association(s) :user_friends in model UserFriend. 
Try 'has_many :friends, :through => :user_friends, :source => <name>'.  Is it one of :user?

Where my test looks like:

it "should create a user and some friends" do
    user = Factory.create(:user_rick)
    f1 = Factory.create(:user_rachel)
    f2 = Factory.create(:user_fred)
    user.friends << f1 << f2

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