Untitled

What's the best way to destroy both sides of a self-referential association?
class User < ActiveRecord::Base
  has_many :relationships, :dependent => :destroy
  has_many :peers, :through => :relationships
end

class Relationship < ActiveRecord::Base
  belongs_to :user
  belongs_to :peer, :class_name => "User"
end

after_destroy do |record|
  other = Relationship.find_by_user_id_and_peer_id(record.peer_id, record.user_id)
  other.destroy if other
end