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: general_configuration.rb
    path of file: ./repos/i-diario/app/models
    
    the code of the file until where you have to start completion: class GeneralConfiguration < ActiveRecord::Base
  acts_as_copy_target

  audited

  include Audit

  has_enumeration_for :backup_status, with: ApiSynchronizationStatus, create_helpers: true
  has_enumeration_f
    
  def daily_frequency_with_type_of_teaching
    return unless type_of_teaching
    return if types_of_teaching_was.sort == types_of_teaching.sort

    removed_types = types_of_teaching_was - types_of_teaching
    return unless DailyFrequencyStudent.find_by(type_of_teaching: removed_types)

    errors.add(:types_of_teaching, I18n.t('enumerations.types_of_teaching.used'))
  end