Replicate problem with uniq associations

app-models-user.rb

class User < ActiveRecord::Base
  has_and_belongs_to_many :followers,  :class_name=>'User', :foreign_key=>'follower_id', :association_foreign_key=>'user_id',     :join_table=>'followers_users', :uniq=>true
  has_and_belongs_to_many :followings, :class_name=>'User', :foreign_key=>'user_id',     :association_foreign_key=>'follower_id', :join_table=>'followers_users', :uniq=>true
end

db-schema.rb

ActiveRecord::Schema.define(:version => 20120315142037) do
  create_table "users", :force => true
  create_table "followers_users", :force => true do |t|
    t.integer 'user_id'
    t.integer 'follower_id'
  end
end