Generate dynamic amount of CollectionType - php

Question

I want to create a few CollectionType fields.
I have moderators, I load all moderators from db and want to assign sub-users to each modeator in form
Try to do something like that:
public function buildForm(FormBuilderInterface $builder, array $options)
{
foreach ($options['moderators'] as $mod) {
$builder
->add('users['.$mod->getId().']', CollectionType::class, array(
'entry_type' => UserFields::class,
'allow_add' => true,
'label' => false,
'entry_options' => array(
),
));
}
}
In $options['moderators'] there is array of moderators entities.
I want to create the same amount of CollectionType fields as moderators entities (example above - does not work because I cant pass [] as field name)
Each moderator have unique id, so I can use it and pass this id to each CollectionType but how?
How to get back this id of CollectionType in Controller function?
How to display this form on page?

Answer 1

I think you need to dive a little deeper into what collections are ;)
Your collection is invalid, because the entry_type should be a formType. I'm guessing in your case this should be EntityType (if you want the user to choose from a list of users).
So assuming you want a Collection of moderators with each moderator a Collection of sub-users (btw you'd normally make a CRUD and edit each moderator separately, so you don't need a collection with a sub-collection), you'd need something like this:
ModeratorCollectionType.php
<?php
namespace AppBundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\CollectionType;
use Symfony\Component\Form\FormBuilderInterface;
class ModeratorCollectionType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('moderators', CollectionType::class, [
'entry_type' => ModeratorType::class,
'prototype' => true,
'allow_add' => true
]);
}
}
ModeratorType.php
<?php
namespace AppBundle\Form;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\CollectionType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
class ModeratorType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('users', CollectionType::class, [
'entry_type' => EntityType::class,
'entry_options' => [
'class' => 'AppBundle:User',
],
'prototype' => true,
'allow_add' => true
]);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => 'AppBundle\Entity\Moderator',
]);
}
}
In your Controller you'd make a form with the ModeratorCollection
$form = $this->createForm(ModeratorCollectionType::class, $data = []);