Optional embed form in Symfony 2

Question

I have two entities in my system: Person and Phone as the following code.

class Person
{
    /**
     * @ORM\\Id
     * @ORM\\Colum         


        

Answer 1

It is also possible to use a very simple data Transformer to solve this problem.

1. Create your Phone data transformer :

   class PhoneTransformer implements DataTransformerInterface
   {
       public function transform($phone)
       {
           if (is_null($phone))
               return new Phone();
   
           return $phone;
       }
   
       public function reverseTransform($phone)
       {
           if (is_null($phone))
               return null;
   
           if (!$phone->getType() && !$phone->getCountryCode() /* ... Test if phone is not valid here */)
               return null;
   
           return $phone;
   }
   

2. Then simply prepend this transformer in your PhoneType form :

   class PhoneType extends AbstractType
   {
       public function buildForm(FormBuilder $builder, array $options)
       {
           $builder
               /* Add fields here :
               ->add( ... )
               */
               ->prependNormTransformer(new PhoneTransformer())
           ;
       }
   }
   

See http://symfony.com/doc/2.0/cookbook/form/data_transformers.html for more details on how implement data transformers.