super hack

gistfile1.txt

module Homepage
  module V2
    class Board
      include Redis::Objects
  
      value :name
      value :exists
  
      counter :views
  
      set :comment_ids
      set :like_user_ids
  
      attr_reader :id
  
      def initialize(id)
        @id = id
      end
  
      def self.find(id)
        if redis.exists("board:#{id}:exists")
          new(id)
        else
          populate(::Board.find(id))
        end
      end
  
      def self.populate(ar_board)
        board = new(ar_board.id)
        board.name = ar_board.name
        Array(ar_board.likes).map {|l| board. like_user_ids << l.user_id }
        board.views.incr(ar_board.views)
        board.exists = true
        board
      end
  
      def self.redis
        Redis.new(db:10)
      end
    end
  end
end

output

board = Homepage::V2::Board.find(2)                                                                                                                                              
=> #<Homepage::V2::Board:0x007ff4466b9968 @id=2>

pry(main)> board.views.to_i                                                                                                                                                                     
=> 518

pry(main)> board.name                                                                                                                                                                       
=> #<Redis::Value "SXSW Band Picks 2012">