Source

						protected function _setNested($name, $value) {
		$current =& $this;
		$path = explode('.', $name);
		$length = count($path) - 1;

		for ($i = 0; $i < $length; $i++) {
			$key = $path[$i];

			if (isset($current[$key])) {
				$next =& $current[$key];
			} else {
				unset($next);
				$next = null;
			}

			if ($next === null && ($model = $this->_model)) {
				$current->set(array($key => $model::connection()->item($model)));
				$next =& $current->{$key};
			}
			$current =& $next;
		}

		if (is_object($current)) {
			$current->set(array(end($path) => $value));
		}
	}