Symfony2 get parameters.yml in entity, special case - symfony

Question

I know its against the framework to make an entity container aware, but this is a special case, i have a credit card entity, and i want to do this:
/**
* #return mixed
*/
public function getNumber()
{
$number = $this->number;
$crypt = base64_decode($number);
$number = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $crypt, MCRYPT_MODE_ECB);
return trim($number);
}
/**
* #param $number
* #return $this
*/
public function setNumber($number)
{
$crypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $number, MCRYPT_MODE_ECB);
$number = trim(base64_encode($crypt));
$this->number = $number;
return $this;
}
And i want the $key to be the secret from parameters.yml, since i dont want to save it in the code.
I can't pass it as a parameter, when i use the FormType, cause the form type will not pass it when it binds the request.
$credit_card = new CreditCard();
$credit_card->setCustomer($customer);
$payment_form = $this->createPaymentForm($credit_card);
$payment_form->handleRequest($request);

Answer 1

Remove data modifications from your Entity, and add it to your FormType.
public function getNumber()
{
return $this->number;
}
public function setNumber($number)
{
$this->number = $number;
return $this;
}
Make your FormType take the parameter as argument.
class CreditCardType extends AbstractType {
private $key;
public function __construct($key) {
$this->key = $key;
}
// ...
// Listen on the PRE_BIND event to update your value before binding
$builder->addEventListener(FormEvents::PRE_BIND, function (FormEvent $event)
{
$data = $event->getData();
$number = $data['number'];
$crypt = $this->encryptNumber($number);
$data['number'] = $crypt;
$event->setData($data);
});
public function encryptNumber($key, $number)
{
$crypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $number, MCRYPT_MODE_ECB);
$number = trim(base64_encode($crypt));
return $number;
}
}
Now, in your createPaymentForm, add the parameter to your FormType instance, like this :
$param = $this->container->getParameter('yourkeyparam');
$form = $this->createForm(new CreditCardType($param), $credit_card, array());
Hope this is what you need.