使用CakePHP制作通用评论系统

本示例介绍如何使用CakePHP框架快速制作通用评论系统。该评论系统支持用户评论、回复、点赞等操作，并且能够方便地嵌入到各种网站中。

1. 创建数据库表
CREATE TABLE `comments` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) DEFAULT NULL,
  `parent_id` int(11) DEFAULT NULL,
  `model` varchar(255) NOT NULL,
  `model_id` int(11) NOT NULL,
  `message` text NOT NULL,
  `likes` int(11) DEFAULT '0',
  `created` datetime DEFAULT NULL,
  `modified` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
);

2. 创建评论模型
<?php
class Comment extends AppModel {
    public $belongsTo = array(
        'User'
    );

    public $validate = array(
        'message' => 'notEmpty'
    );

    public function beforeSave($options = array()) {
        if (empty($this->data[$this->alias]['id'])) {
            $this->data[$this->alias]['created'] = date('Y-m-d H:i:s');
        }
        $this->data[$this->alias]['modified'] = date('Y-m-d H:i:s');
        return true;
    }
}

3. 创建评论控制器
<?php
class CommentsController extends AppController {
    public $helpers = array('Html', 'Form');
    public $components = array('Session');

    public function add() {
        if ($this->request->is('post')) {
            $this->Comment->create();
            $this->request->data['Comment']['user_id'] = $this->Auth->user('id');
            if ($this->Comment->save($this->request->data)) {
                $this->Session->setFlash(__('The comment has been saved.'));
                return $this->redirect(array('action' => 'index'));
            } else {
                $this->Session->setFlash(__('The comment could not be saved. Please, try again.'));
            }
        }
    }

    public function index() {
        $this->set('comments', $this->Comment->find('all'));
    }
}

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