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_search_index_attributes.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::CanLookupSearchIndexAttributes
  extend ActiveSupport::Concern

  class RequestCache < ActiveSupport::CurrentAttributes
    attribute :integer_attribute_names

    def integer_fields(class_name)
      self.integer_attribute_names ||= {}

      updated_at = ObjectManager::Attribute.maximum('updated_at')
      return self.integer_attribute_names[class_name][:data] if self.integer_attribute_names[class_name].present? && self.integer_attribute_names[class_name][:updated_at] 
    
  def search_index_attribute_lookup(include_references: true)
    attributes = self.attributes
    self.attributes.each do |key, value|
      break if !include_references

      attribute_name = key.to_s

      # ignore standard attribute if needed
      if self.class.search_index_attribute_ignored?(attribute_name)
        attributes.delete(attribute_name)
        next
      end

      # need value for reference data
      next if !value

      # check if we have a referenced object which we could include here
      next if !search_index_attribute_method(attribute_name)

      # get referenced attribute name
      attribute_ref_name = self.class.search_index_attribute_ref_name(attribute_name)
      next if !attribute_ref_name

      # ignore referenced attributes if needed
      next if self.class.search_index_attribute_ignored?(attribute_ref_name)

      # get referenced attribute value
      value = search_index_value_by_attribute(attribute_name)
      next if !value

      # save name of ref object
      attributes[ attribute_ref_name ] = value
    end