Inject Symfony EntityManager into Form Type via Services

Question

I need to modify some fields in my form (label and class), based on whether the entity is the latest published version or not. So I need to be able to inject the entity mana

Answer 1

You got that error because you`re creating form type like this:

$form = $this->createForm(new ViewType(), $view);

You create new object ViewType without any arguments and it needs to be called with EntityManager. You can simply pass entity manager from controller, like this:

$em = $this->get('doctrine.orm.entity_manager'); // or doctrine.orm.billing_entity_manager
$form = $this->createForm(new ViewType($em), $view);

In this case you don't even need to define this form type as a service.

Use of doctrine.orm.entity_manager or doctrine.orm.billing_entity_manager depends on what you need to fetch inside ViewType - (from witch database).

UPDATE:

Define form type as a service.

Add this two services to your configuration (services.yml):

services
    gutensite_cms.form.view:
        factory_method: createNamed
        factory_service: form.factory
        class: Symfony\Component\Form\Form
        arguments:
            - view_form                        # name of the form
            - view                             # alias of the form type
            - null                             # data to bind, this is where your entity could go if you have that defined as a service
            - { validation_groups: [Default] } # validation groups

    gutensite_cms.form.type.view:
        class: Gutensite\CmsBundle\Form\Type\ViewType
        arguments: [ "@doctrine.orm.entity_manager" ]
        tags:
            - { name: form.type, alias: view }

Then you can create new form by executing this inside your controller (or whatever has container) without manualy passing any arguments (they will be injected automaticly):

public function newAction()
{
    $view = ...;
    $form = $this->get( 'gutensite_cms.form.view' );

    // set initial form data if needed
    $form->setData( $view );
}