Two tables in the same page

Hello

I am trying to understand Cakephp but i am missing something. I want to display two tables. I tried many different things but i ALWAYS end up on the same message "Call to a member function find() on a non-object"

CREATE TABLE posts (

    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,

    title VARCHAR(50),

    body TEXT,

    created DATETIME DEFAULT NULL,

    modified DATETIME DEFAULT NULL

);

CREATE TABLE comments (

post_id INT UNSIGNED AUTO_INCREMENT,

    name VARCHAR(50),

    comment TEXT,

    created DATETIME DEFAULT NULL,

FOREIGN KEY (post_id) REFERENCES posts(id)

);

PostsController.php

<?php

class PostsController extends AppController {

    public $helpers = array('Html', 'Form');

    public function index() {

        $this->set('posts', $this->Post->find('all'));

$this->set('comments', $this->Comment->find('all'));

    }

}

?>

Posts.php

<?php

class Posts extends AppModel {

}

?>

Comments.php

<?php

class Comments extends AppModel {

    public $hasMany = array(

        'Comments' => array(

            'className' => 'Comment',

            'foreignKey' => 'post_id',

            'dependent' => true

        )

    );

}

?>

The problems seems to be in the PostController file but i don't know what is the problem.

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