Cakephp标记 - 自动保存新标记和标记关系

I read a lot about tagging in CakePHP but I can't find a "clean" way to save a Post and the Tags to this post. I have all which is necessary the Post Table, Model and Controller, the Tag table, Model and Controller and the posts_tags table. I created the HABTM Associations in the Post and the Tag Model.I read a lot about tagging in CakePHP but I can