小编Alb*_*lla的帖子

我和实体A将oneToMany与实体B联系起来.我希望用户可以选择从现有的B实体中选择或者在A类的形式上创建一个新的实体.到目前为止,我在我的表单上有这个:

->add('ExistingB', 'entity', array(
            'class' => 'AppBundle\Entity\B',
            'required'    => false,
            'property_path' => 'B',
            'mapped' => false,
        ))

 ->add('newB',  new BType(), array(
            'required'    => false,
            'property_path' => 'B',
            'mapped' => false,
        ));

 $builder->addEventListener(
     FormEvents::POST_SUBMIT , function (FormEvent $event) {
          $formB= $event->getForm()->get('newB');

         if ($formB->get('name')->getData() != null){
                 //here i need to somehow say to the form that it needs to set mapped true 
                //to the formB field so it can create a new entity and update the relationship
         }else{
                  //here I need to …

对不起,我是重复的,但我似乎没有找到我需要澄清的确切方案.

所以我的问题是为什么:

var = array ();
echo count (var);

打印0.

还有这个:

var = array (array());
echo count (var);

打印1？

谢谢!