將可選參數設置爲buildForm

Question

我使用OptionsResolverInterface將一些額外參數傳遞給我的表單。這是形式的代碼：

class OrdersType extends AbstractType { 
    public function buildForm(FormBuilderInterface $builder, array $options) 
    { 
     if ($options['curr_action'] !== NULL) 
     { 
      $builder 
        ->add('status', 'choice', array(
         'choices' => array("Pendiente", "Leido"), 
         'required' => TRUE, 
         'label' => FALSE, 
         'mapped' => FALSE 
        )) 
        ->add('invoice_no', 'text', array(
         'required' => TRUE, 
         'label' => FALSE, 
         'trim' => TRUE 
        )) 
        ->add('shipment_no', 'text', array(
         'required' => TRUE, 
         'label' => FALSE, 
         'trim' => TRUE 
      )); 
     } 

     if ($options['register_type'] == "natural") 
     { 
      $builder->add('person', new NaturalPersonType(), array('label' => FALSE)); 
     } 
     elseif ($options['register_type'] == "legal") 
     { 
      $builder->add('person', new LegalPersonType(), array('label' => FALSE)); 
     } 
    } 

    public function setDefaultOptions(OptionsResolverInterface $resolver) 
    { 
     $resolver->setRequired(array(
      'register_type' 
     )); 

     $resolver->setOptional(array(
      'curr_action' 
     )); 

     $resolver->setDefaults(array(
      'data_class' => 'Tanane\FrontendBundle\Entity\Orders', 
      'render_fieldset' => FALSE, 
      'show_legend' => FALSE, 
      'intention' => 'orders_form' 
     )); 
    } 

    public function getName() 
    { 
     return 'orders'; 
    } 

} 

而且這是我的」建設在控制器形式：

$order = new Orders(); 
$orderForm = $this->createForm(new OrdersType(), $order, array('action' => $this->generateUrl('save_order'), 'register_type' => $type)); 

但我發現了這個錯誤：

Notice: Undefined index: curr_action in /var/www/html/tanane/src/Tanane/FrontendBundle/Form/Type/OrdersType.php line 95

爲什麼？此代碼設置是否不是curr_action可選形式$options？

$resolver->setOptional(array(
    'curr_action' 
)); 

Answer 1

正是。訪問未知數組密鑰時，PHP觸發NOTICE。

要妥善處理好這一點，你有2個解決方案：

** 1）更換：if ($options['curr_action'] !== NULL)

與if (array_key_exists('curr_action', $options) && $options['curr_action'] !== NULL)

有點麻煩，但它的工作原理...

2 ）另一種解決方案是定義默認值：

$resolver->setDefaults(array(
     'data_class' => 'Tanane\FrontendBundle\Entity\Orders', 
     'render_fieldset' => FALSE, 
     'show_legend' => FALSE, 
     'intention' => 'orders_form', 
     'curr_action' => NULL // <--- THIS 
    ));