在保存到數據庫之前修改數據

如何在cakephp將數據放入mysql之前修改控制器中的數據？

function add() { 
    if (!empty($this->data)) { 
     $this->Template->create(); 

        /* This works! */ 
     $this->data['Template']['slug']  = Inflector::slug(utf8_encode(strtolower($this->data['Template']['name'])),'-'); 

        /* does not work ! */ 
        $this->data['Template']['created'] = time();   
     $this->data['Template']['category_id'] = $this->data['Template']['category']; 

     if ($this->Template->save($this->data)) { 
      $this->Session->setFlash('Your post has been saved.'); 
      $this->redirect(array('action' => 'index')); 
     } 
    }else{ 
        /* dropdown */ 
     $this->set('categories',$this->Template->Category->find('list')); 
    } 
}

場在我的數據庫：

模板