def fill_article_object(article_id, title, site, updated, content, url, cover_url,
        is_fav):
    """
    article object:
        {
            article_id: article_id,
            title: title,
            site: site_title,
            updated: YYYY-MM-DD,
            content: html content,
            url: origin article url,
            cover_url: url, may be null
            is_fav: is_fav, boolean
        }
    """
    return dict(article_id=article_id, title=title, site=site,
            updated=updated.strftime("%Y-%m-%d"), content=content, url=url,
            cover_url=cover_url, is_fav=is_fav)