Symfony - Form with multiple entity objects - symfony

Question

I'm running Symfony 3.4 LTS and I have an entity Attribute:
<?php
class Attribute
{
private $id;
private $code;
private $value;
private $active;
// My getters and setters
Below the database table:
I would like to get, in a form, all the rows with code == 'productstatus'. I tried:
<?php
$attributes = $this->getDoctrine()->getRepository(Attribute::class)->findBy(['code' => 'productstatus']);
// $attributes contains array with 3 objects 'Attribute'
$form = $this->createFormBuilder($attributes);
$form->add('value', TextType::class);
$output = $form->getForm()->createView();
If I dump() the $output var in Twig:
... I'm unable to make a loop to display the 3 fields with values.
{{ form_start(form) }}
{{ form_widget(form) }}
{{ form_end(form) }}
Result :
My goal is to allow the user to edit all the values of a specific attributes in the same form (or multiple forms, but in the same page). I already tried with CollectionType without success.

Answer 1

I found a solution: create 2 nested forms and use CollectionType. Hope it helps.
<?php
// Controller
$attributes = $this->getDoctrine()->getRepository(Attribute::class)->findBy(['code' => 'productstatus']);
$form = $this->createForm(AttributeForm::class, ['attributes' => $attributes]);
// AttributeForm
$builder
->add('attributes', CollectionType::class, [
'entry_type' => AttributeValueForm::class,
'allow_add' => true,
'by_reference' => false,
'allow_delete' => true,
]);
// AttributeValueForm
$builder
->add('value', TextType::class, ['label' => false, 'required' => false])
->add('active', CheckboxType::class, ['label' => false, 'required' => false])
// Twig view
{{ form_start(form) }}
{% for attribute in form.attributes.children %}
<tr>
<td>{{ form_widget(attribute.value) }}</td>
<td>{{ form_widget(attribute.active) }}</td>
</tr>
{% endfor %}
{{ form_end(form) }}

Answer 2

You an use an if statement in the your AttributeType like in the example below:
$builder
->add('entree', EntityType::class, array('class'=>'cantineBundle:plat',
'choice_label'=>function($plat){
if($plat->getType()=='Entree'&&$plat->getStatus()=="non reserve"){
return $plat->getNomPlat();
}
},
'multiple'=>false)
);