class PrecomputeFeedService < BaseService MAX_FEED_SIZE = 800 # Fill up a user's home/mentions feed from DB and return it # @param [Symbol] type :home or :mentions # @param [Account] account # @return [Array] def call(type, account) statuses = send(type.to_s, account).order('created_at desc').limit(MAX_FEED_SIZE) statuses.each { |status| push(type, account.id, status) } statuses end private def push(type, receiver_id, status) redis.zadd(key(type, receiver_id), status.id, status.id) end def home(account) Status.where(account: [account] + account.following).with_includes.with_counters end def mentions(account) Status.where(id: Mention.where(account: account).pluck(:status_id)).with_includes.with_counters end def key(type, id) "feed:#{type}:#{id}" end def redis $redis end end