Symfony 2.4 create form through a service - symfony

Question

In Symfony 2.4, I want to create a registration form through a service. I played around with the service configuration and the form components factories but everytime i got the following exception:
Catchable Fatal Error: Argument 1 passed to Symfony\Component\Form\Form::__construct() must be an instance of Symfony\Component\Form\FormConfigInterface, instance of Bestxtech\UserBundle\Form\RegistrationType given
code as follow:
services:
bestxtech.form.type.registration:
class: Bestxtech\UserBundle\Form\RegistrationType
arguments: [null]
tags:
- { name: form.type, alias: registration }
public: flase
bestxtech.form.registration:
factory-method: create
factory-service: form.factory
class: Symfony\Component\Form\Form
arguments: ["#bestxtech.form.type.registration"]
RegistrationType as
//Bestxtech\UserBundle\Form\RegistrationType
<?php
namespace Bestxtech\UserBundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
class RegistrationType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('username')
->add('plainPassword', 'repeated', array(
'type' => 'password',
'first_options' => array('label' => 'Password'),
'second_options' => array('label' => 'Confirm password'),
'invalid_message' => 'Password mismatch'
))
->add('email', 'email', array('label' => 'Email address'));
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Bestxtech\UserBundle\Entity\User',
'validation_groups' => array('Registration')
));
}
public function getName()
{
return 'user';
}
}
Would be nice if someone can give me some advice, thank you.

Answer 1

Your form factory service definition is wrong. Try to look at this: http://symfony.com/doc/current/components/dependency_injection/factories.html.
But. Are you sure it is good idea? Pay attention that create method from FormFactory takes two additional arguments: $data and $options. If you define building your form as you've showed you won't be able to pass these arguments to create method.
I would use form.factory service directly if I was you. Like this:
$formFactory = $container->get('form.factory');
$form = $formFactory->create($container->get('form.type.registration'));
edit:
The problem was you've used dashes instead of underscores, try below:
services:
bestxtech.form.type.registration:
class: Bestxtech\UserBundle\Form\RegistrationType
arguments: [null]
tags:
- { name: form.type, alias: registration }
public: flase
bestxtech.form.registration:
factory_method: create
factory_service: form.factory
class: Symfony\Component\Form\Form
arguments: ["#bestxtech.form.type.registration"]