Cakephp acl help: How are aros and acos table created?

I can't understand how are aros and acos tables created.

There are lft , rht columns in aros table.

I have read the documentation of cake acl.

http://book.cakephp.org/view/1550/Setting-up-permissions开发者_如何学C

I also understand when do i need Acl , i can do $this->Auth->allow(..

Thanks in advance.

they are created here. In the cookbook, there's a tutorial just for ACL.

I found this tutorial useful. Hope it helps you too. But I have not check it via implementation. How to Use CakePHP’s Access Control Lists

NOTE: This tutorial does not follow cake 2.x convention so be careful.