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: hold.rb
    path of file: ./repos/circulate/app/models
    
    the code of the file until where you have to start completion: class Hold < ApplicationRecord
  HOLD_LENGTH = 7.days

  has_one :appointmen
    
  def self.start_waiting_holds(now = Time.current, &block)
    started = 0

    active(now).includes(item: :borrow_policy).find_each do |hold|
      if hold.item.status == Item.statuses[:maintenance]
        Rails.logger.debug "[hold #{hold.id}]: item in maintenance mode"
        next
      end

      unless hold.item.holdable?
        Rails.logger.debug "[hold #{hold.id}]: item is not holdable"
        next
      end