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: can_lookup.rb
    path of file: ./repos/zammad/app/models/application_model
    
    the code of the file until where you have to start completion: # Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

module ApplicationModel::CanLookup
  extend ActiveSupport::Concern

  class_methods do

=begin

lookup model from cache (if exists) or retrieve it fr
    
    def lookup(**attr)
      raise ArgumentError, "Multiple lookup attributes given (#{attr.keys.join(', ')}), only support (#{lookup_keys.join(', ')})" if attr.many?

      attr.transform_keys!(&:to_sym).slice!(*lookup_keys)
      raise ArgumentError, "Valid lookup attribute required (#{lookup_keys.join(', ')})" if attr.empty?

      return find_by(attr) if columns.exclude?('updated_at')

      Rails.cache.fetch("#{self}/#{latest_change}/lookup/#{Digest::MD5.hexdigest(Marshal.dump(attr))}") do
        find_by(attr)
      end
    end