Calling class using service in Form - php

Question

I have a question about service and Form in Symfony2,so I created my calss form and I hope to add a multiselect list of cities then I want to get list of cities from another class "city",so how I can call my class "city" in my form using "Service" to get a function "getcities" to return me a list of cities? (I dont use Doctrine here)...
Edit
namespace Acme\DemoBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
class CityType extends AbstractType
{
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'choices' => array( /**
* Here I will call function getcities(return list of cities)
*/
)
));
}
public function getParent()
{
return 'choice';
}
public function getName()
{
return 'gender';
}
}
class City.php :
Class City {
/**
* here i will get list of cities
*/
public function getcities()
{
.....
return $Listcities;
}
}
So I would like to use "Service" to call function "getcities" in form?

Answer 1

The form objects are not container-aware...at least, they're not meant to be. That said, your controller should use the service to get the cities, and then it should pass that list into the form object either through a constructor or a method.
Controller:
class SomethingController
{
public function someAction()
{
...
$cities = $this->get("citiesService")->getCities();
$form = $this->createForm(new SomeType($cities), $someEntity);
...
}
}
Form:
class SomeType extends AbstractType
{
private $cities;
public function __construct($cities)
{
$this->cities = $cities;
}
public function buildForm(FormBuilder $builder, array $options)
{
// Now you have access to $this->cities, so you can use it to build the form
}
}

Answer 2

Do you can set City object as form data object?
so it can looks like that...
$form = $this->createForm(new SomeType(), new City());
class SomeType extends AbstractType
{
public buildForm(FormBuilderInterface $builder, array $options)
{
$formFactory = $builder->getFormFactory();
$builder->addEventListener(
FormsEvents::PRE_SET_DATA,
function (FormEvent $event) use ($formFactory) {
$event->getForm()->add(
$formFactory->createNamed(
'gender',
'choice',
null,
array(
'choices' => $event->getData()->getCites()
)
)
);
}
);
}
}