class Feed def initialize(type, account) @type = type @account = account end def get(limit, offset = 0) unhydrated = redis.zrevrange(key, offset, limit) status_map = Hash.new # If we're after most recent items and none are there, we need to precompute the feed return PrecomputeFeedService.new.(@type, @account).take(limit) if unhydrated.empty? && offset == 0 Status.where(id: unhydrated).each { |status| status_map[status.id.to_s] = status } return unhydrated.map { |id| status_map[id] } end private def key "feed:#{@type}:#{@account.id}" end def redis $redis end end