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: auth_app_update_form.rb
    path of file: ./repos/identity-idp/app/forms/two_factor_authentication
    
    the code of the file until where you have to start completion: module TwoFactorAuthentication
  class AuthAppUpdateForm
    include ActiveModel::Model
    include ActionView::Helpers::TranslationHelper

    attr_reader :u
    
    def validate_unique_name
      return unless user.auth_app_configurations.where.not(id: configuration_id).find_by(name:)
      errors.add(
        :name,
        :duplicate,
        message: t('errors.manage_authenticator.unique_name_error'),
      )
    end