# File lib/google-authenticator-rails/active_record/helpers.rb, line 34
      def google_qr_uri(size = nil)
        GoogleQR.new(:data => ROTP::TOTP.new(google_secret_value, :issuer => google_issuer).provisioning_uri(google_label), :size => size || self.class.google_qr_size).to_s
      end