You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: list.rb
    path of file: ./repos/picky/server/lib/picky/backends/redis
    
    the code of the file until where you have to start completion: module Picky

  module Backends

    class Redis

      class List < Basic

        # Clear the index for this list.
        #
        # Note: Perhaps we can use a server only com
    
        def dump hash
          unless @realtime
            clear
            hash.each_pair do |key, values|
              redis_key = "#{namespace}:#{key}"
              i = 0
              values.each do |value|
                i += 1
                client.zadd redis_key, i, value
              end
            end
          end