封裝一下CakePHP的Model，增加鏈式操作

class AppModel extends Model {
	public function save($data=null, $validate=true, $fieldList=array()) {
		if (isset($this->data) && isset($this->data[$this->name])) {
			unset($this->data[$this->name]['modified']);
		}
		if (isset($data) && isset($data[$this->name])) {
			unset($data[$this->name]['modified']);
		}
 		return parent::save($data, $validate, $fieldList);
	}
	
	protected $_params;
	/*
     * custom data query method goes here
     */
	public function relation($params) { $this->_params['recursive'] = $params; return $this; }
	
	public function where($params) { $this->_params['conditions'] = $params; return $this; }
	
	public function order($params) { $this->_params['order'] = $params; return $this; }
	
	public function fields($params) { $this->_params['fields'] = $params; return $this; }
	
	public function page($params) { $this->_params['page'] = $params; return $this; }
	
	public function limit($params) { $this->_params['limit'] = $params; return $this; }

	public function offset($params) { $this->_params['offset'] = $params; return $this; }
	
	public function joins($params) { $this->_params['joins'] = $params; return $this; }
	
	public function group($params) { $this->_params['group'] = $params; return $this; }
	
	public function count() {
        $r = $this->find('count', $this->_params);
        $this->_params = array();
        return $r;
    }
    
    public function first() {
        $r = $this->find('first', $this->_params);
        $this->_params = array();
        return $r;
    }
    
    public function select() {
        $r = $this->find('all', $this->_params);
        $this->_params = array();
        return $r;
    }
    
    public function lists() {
        $r = $this->find('list', $this->_params);
        $this->_params = array();
        return $r;
    } 
    
    public function threaded() {
        $r = $this->find('threaded', $this->_params);
        $this->_params = array();
        return $r;
    }

    public function neighbors() {
        $r = $this->find('neighbors', $this->_params);
        $this->_params = array();
        return $r;
    } 
    
	public function drop($cascade=false) {
        if (!empty($this->_params['conditions'])) {
            $r = $this->deleteAll($this->_params['conditions'], $cascade);
        } else {
            $r = array();
        }
        $this->_params = array();
        return $r;
    }
}