Symfony2 - 对表单类型的依赖注入不传递值

Question

I have a form type, but would like to use the container within this form to detect the current user ID (FOSUserBundle). I'm not sure if it's best to inject the container into the form or the user class directly, but I can't get either to work. Below is my form type:

class AddValueType extends AbstractType
{
    private $container;

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        //build form, get user ID
    }
}

Services.yml:

parameters:
    AddValueType.class: Main\MyBundle\Form\Type\AddValueType

services:
    main.form.addValueType:
        class: "%AddValueType.class%"
        arguments: ['@service_container']

I'm getting the error Warning: Missing argument 1 for Main\MyBundle\Form\Type\AddValueType::__construct() so it's obviously not being passed to the form type correctly. I'm pretty new to dependency injection but can't work out where I'm going wrong? I've got others working in my application in the same way for services.

UPDATE

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add(
                $builder->create('aDate', 'hidden' ,array('empty_data' => new \DateTime() ))->addViewTransformer( new DateTimeToStringTransformer() )
            )
            ->add('field1', 'hidden')
            ->add('field2', 'hidden')
            ->add('submit', 'submit')
            ->getForm();

        $builder->addEventListener(FormEvents::PRE_BIND, function(FormEvent $event) {

            $data = $event->getData();
            $data['addedByUser'] = $userId;//this is what I need to fetch
            //some other simple logic to set data after form is sent
            $event->setData($data);
        });
    }

    public function getName()
    {
        return 'AddValue';
    }

created in my controller with:

$form = $this->createForm(new AddValueType(), $myDoctrineEntity/Class);

Answer 1

You need to tag the service as a form.

main.form.addValueType:
    class: "%AddValueType.class%"
    arguments: ['@service_container']
    tags:
        - { name: form.type, alias: valueType }

The name of the form needs valueType. You're now able to use the form by it's name instead of creating a new instance manually.

And indeed injecting the service container is bad practice.