module Hari
  class Relation < Entity
    module SortedSet
      extend self

      def create(rel)
        Relation::DIRECTIONS.each { |d| Hari.redis.zadd rel.key(d), rel.weight(d), rel.id }
      end

      def delete(rel)
        Relation::DIRECTIONS.each { |d| Hari.redis.zrem rel.key(d), rel.id }
      end

    end
  end
end