如何使用cakephp更新数据库中的一个字段？

Question

public function checkStatus(){              
    $this->PostOffer->id = $post_offer_id;  
    if($this->PostOffer->save(array(
        'payment_status' => OrderStatus::PaymentCompleted ))) {
             $this->Order->post_offer_id = $post_offer_id;
             if($this->Order->saveField(array(
                 'payment_status' => OrderStatus::SellerPaymentComplete))) {
                  return "true"; 

               }
           }
        }

当我使用此代码PostOffer时 - 在DB上更新了payment_status但是 订单 - payment_status未在DB中更新。