def api_comments(*, page='1'):
    page_index = get_page_index(page)
    num = yield from Comment.findNumber('count(id)')
    p = Page(num, page_index)
    if num == 0:
        return dict(page=p, comments=())
    comments = yield from Comment.findAll(orderBy='created_at desc', limit=(p.offset, p.limit))
    return dict(page=p, comments=comments)
def get_blog(id):
    blog = yield from Blog.find(id)
    comments = yield from Comment.findAll('blog_id=?', [id], orderBy='created_at desc')
    for c in comments:
        c.html_content = text2html(c.content)
    blog.html_content = markdown2.markdown(blog.content)
    return {
        '__template__': 'blog.html',
        'blog': blog,
        'comments': comments
    }