Access session from formType in Symfony2

Question

I'm trying to get session data into my forms but i don't know how to do.

I could pass it to the constructor of my FormType but the FormType that actually use the session is nested 3 levels deeper in the main form. So i think that it is dirty to pass the session object in each constructor of each form type like this :

->add('name', new NestedFormType($this->session))

I also thought about using formsType as service. So i would have a parent for each of my formsType that should be injected with session.

But how can i do that without defininf all my forms as services ?

Futhermore, i can't access to the DIC inside of my FormTypes. So, it's ok for the creation of the first formType object (which is created in the controller which can access to DIC ) but the nested FormTypes cannot be instianciated from their parent.

Is there a clean solution?

Answer 1

You need to define this parent form as a service and pass the session as the argument.

look at this question: Create a form as a service in Symfony2

Answer 2

You don't need to define services for your higher level form types as long as you refer to the inner, injected form type by its alias:

NestedFormType service definition:

nested.form.type:
    class: Type\NestedFormType
    tags:
        - { name: form.type, alias: nested_form }
    arguments: [ @security.context ]

NestedFormType:

class NestedFormType extends AbstractType
{
    private $security_context;

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

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // do something with $this->security_context
    }

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

ParentFormType:

public function buildForm(FormBuilderInterface $builder, array $options) {
    $builder->add('name', 'nested_form'); 
    // 'nested_form' matches service definition and NestedFormType::getName()
}