def tag(tag_id):
tag = Tag.cache(tag_id)
post_ids = PostTag.query.filter_by(tag_id=tag_id).order_by(
PostTag.post_id.desc()).with_entities(PostTag.post_id).all()
posts = Post.get_multi(post_ids)
return render_template('tag.html', tag=tag, posts=posts)
