Why Sonata Admin doesn't save my custom doctrine field? - symfony

Question

I writed the simpliest Money class ever:
class Money
{
private $amount;
private $currency;
// getters and setters here
public function toArray() {
return ['amount' => $this->amount, 'currency' => $this->currency];
}
}
Then I created Doctrine custom type which extend Sonata's JsonType:
class MoneyType extends JsonType
{
/**
* #param Money $value
* #param AbstractPlatform $platform
* #return mixed|null|string
*/
public function convertToDatabaseValue($value, AbstractPlatform $platform)
{
return parent::convertToDatabaseValue($value->toArray(), $platform);
}
public function convertToPHPValue($value, AbstractPlatform $platform)
{
return new Money(parent::convertToPHPValue($value, $platform));
}
public function getName()
{
return 'money';
}
}
Then I added it in my config.yml:
doctrine:
dbal:
types:
json: Sonata\Doctrine\Types\JsonType
money: Enl\CurrencyBundle\Doctrine\Type\MoneyType
Then I added form type for this data piece:
class MoneyType extends AbstractType
{
// Some trivial getters and setters for dependencies here
/**
* Returns the name of this type.
*
* #return string The name of this type
*/
public function getName()
{
return 'enl_money';
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults([
'currencies' => $this->getPossibleCurrencies(),
'data_class' => 'Enl\CurrencyBundle\Model\Money'
]);
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('currency', 'choice', ['choices' => $options['currencies'], 'required' => true])
->add('amount', 'number', ['required' => true]);
}
public function getParent()
{
return 'form';
}
}
And then I added the field to my model:
/**
* #var Money
* #ORM\Column(type="money", nullable=true)
*/
protected $price;
And finally my sonata admin form:
$form
->with('editor.dish', ['class' => 'col-md-8'])
->add('price', 'enl_money')
// blah-blah-blah
The problem is that Sonata Admin just doesn't save the form value!
I added var_dump($object); to Admin::update() method - the new value is there in object.
After that I created the simple test:
$dish = new Dish();
$dish->setPrice(new Money(7000, "BYR"));
$em = $this->getContainer()->get('doctrine.orm.entity_manager');
$em->persist($dish);
$em->flush();
It works! What should I change in my Admin class to get this working?