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