Symfony - How to call the Service Container object from form events? - forms

Question

How to call the Service Container object from form events?
I created a form where the webmaster can create books. I want to create a Sylius Product when an Book is created through this form:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title', TextType::class, array(
'attr' => array('class'=>'block1')
))
->addEventListener(
FormEvents::PRE_SET_DATA,
array($this, 'onPreSetData')
)
;
}
public function onPreSetData(FormEvent $event)
{
$book = $event->getData();
$form = $event->getForm();
$productFactory = $this->container->get('sylius.factory.product');
}
For that purpose, I need to reach 'sylius.factory.product' service as explained there: http://docs.sylius.org/en/latest/book/products/products.html
$productFactory = $this->container->get('sylius.factory.product');
I can access it from any Controller, but unfortunately I can't access it from the BookType class I defined.
Here is the error returned by Symfony when I try to access it from the buildForm() or onPreSetData() function:
Notice: Undefined property: FrontendBundle\Form\BookType::$container

Answer 1

Pass the service, to the form, via the options

Answer 2

Actually this process is very well explained in Symfony Documentation: http://symfony.com/doc/current/form/form_dependencies.html
So I updated the way I was calling my form like that:
$editForm = $this->createForm($form, $item, array( //WITH SYLIUS
'sylius_factory_product' => $this->get('sylius.factory.product')
));
Instead:
$editForm = $this->createForm($form, $item); //WIHOUT SYLIUS
Plus, I adapted the configureOptions function like that:
public function configureOptions(OptionsResolver $resolver)
{
$resolver
->setDefaults(array(
'data_class' => 'FrontendBundle\Entity\Book'
))
->setRequired('sylius_factory_product')
;
}
Instead:
public function configureOptions(OptionsResolver $resolver)
{
$resolver
->setDefaults(array(
'data_class' => 'FrontendBundle\Entity\Book'
))
;
}
You can now access your service in the buildForm function like so:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$productFactory = $options['sylius_factory_product'];
//...
}