private function getFileUploadPropertyName($realCallerMethod)
    {
        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
        $callerMethodName = $backtrace[1]['function'];
        if ($callerMethodName === $realCallerMethod) {
            $callerMethodName = $backtrace[2]['function'];
        }

        return lcfirst(substr($callerMethodName, 3, -6));
    }