How to Embed a Collection of Forms

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// src/AppBundle/Entity/Task.php
namespace AppBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;

class Task
{
    protected $description;
    protected $tags;

    public function __construct()
    {
        $this->tags = new ArrayCollection();
    }

    public function getDescription()
    {
        return $this->description;
    }

    public function setDescription($description)
    {
        $this->description = $description;
    }

    public function getTags()
    {
        return $this->tags;
    }
}

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// src/AppBundle/Entity/Tag.php
namespace AppBundle\Entity;

class Tag
{
    private $name;

    public function getName()
    {
        return $this->name;
    }

    public function setName($name)
    {
        $this->name = $name;
    }
}

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// src/AppBundle/Form/TagType.php
namespace AppBundle\Form;

use AppBundle\Entity\Tag;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class TagType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name');
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Tag::class,
        ]);
    }
}

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// src/AppBundle/Form/TaskType.php
namespace AppBundle\Form;

use AppBundle\Entity\Task;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\CollectionType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class TaskType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('description');

        $builder->add('tags', CollectionType::class, [
            'entry_type' => TagType::class,
            'entry_options' => ['label' => false],
        ]);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Task::class,
        ]);
    }
}

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// src/AppBundle/Controller/TaskController.php
namespace AppBundle\Controller;

use AppBundle\Entity\Tag;
use AppBundle\Entity\Task;
use AppBundle\Form\TaskType;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class TaskController extends Controller
{
    public function newAction(Request $request)
    {
        $task = new Task();

        // dummy code - add some example tags to the task
        // (otherwise, the template will render an empty list of tags)
        $tag1 = new Tag();
        $tag1->setName('tag1');
        $task->getTags()->add($tag1);
        $tag2 = new Tag();
        $tag2->setName('tag2');
        $task->getTags()->add($tag2);
        // end dummy code

        $form = $this->createForm(TaskType::class, $task);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // ... do your form processing, like saving the Task and Tag entities
        }

        return $this->render('task/new.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}