symfony : get object Forms - php

Question

how I can get the object attributes that i use to build this form :
controller code
$assistance1 = new Assistance();
$assistance1->setEtudiant($etudiant1);
$form = $this->get('form.factory')->create(new AssistanceType(), $assistance1);
buildform function on the Form class
/**
* #param FormBuilderInterface $builder
* #param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('present', 'checkbox',array(
'required' => false,
))
;
}

Answer 1

You could add $this->assistance1; to AssistenceType and do new AssistenceType($assistence1); But this is not good design imo.
class AssistenceType extends AbstractType
{
private $assistence1;
public function __construct($assistence1)
{
$this->assistence1 = $assistence1;
}
public function buidlForm(FormBuilderInterface $builder, array $options)
{
$builder->add('present', 'checkbox', array(
'required' => false,
'label' => $this->assistence1->getEtudiant()
));
}
}
and use it like this
$form = $this->get('form.factory')->create(new AssistanceType($assistence1), $assistance1);

Answer 2

You should keep in mind that building the form is decoupled from it's data. If you need the form to change based on it's properties, you will need to implement different kinds of event listeners or subscribers. Think of it like this: you only need one builder for many forms.
To implement a listener or subscriber on the form, you will most probably be off easiest to first declare your form type as a service, then register the service you will need to alter the form's behaviour, and tag it as an event listener for the form. This is all in the docs :)
However, the Form component of Symfony tends to be one of the most complex, so don't hesitate to clarify your problem a bit more so I can assist you more effectively.