public function submit($postContent)
    {
        $linkData = [];
        if (!empty($postContent['internal'])) {
            $linkData['link'] = 'internal://' . $postContent['internal'];
        } elseif (!empty($postContent['custom'])) {
            $linkData['link'] = $postContent['custom'];
        } else {
            $linkData['link'] = '';
        }
        $linkData['target'] = !empty($postContent['target']) ? $postContent['target'] : '';
        return $this->save(empty($linkData['link']) ? '' : serialize($linkData));
    }