signed_id_verifier

# File activerecord/lib/active_record/signed_id.rb, line 96
      def signed_id_verifier
        if signed_id_verifier_secret
          @signed_id_verifier ||= begin
            secret = signed_id_verifier_secret
            secret = secret.call if secret.respond_to?(:call)

            if secret.nil?
              raise ArgumentError, "You must set ActiveRecord::Base.signed_id_verifier_secret to use signed IDs"
            end

            ActiveSupport::MessageVerifier.new secret, digest: "SHA256", serializer: JSON, url_safe: true
          end
        else
          return _signed_id_verifier if _signed_id_verifier

          if ActiveRecord.message_verifiers.nil?
            raise "You must set ActiveRecord.message_verifiers to use signed IDs"
          end

          ActiveRecord.message_verifiers["active_record/signed_id"]
        end
      end