Message:

I'm doing an app with Symfony 5 and there is a problem i don't manage to find a solution, I have no idea.

I want to make a form of an entity "Person".
A Person can add in his family other Person.

So in my entity I made a Many-To-Many self referencing to Person.

class Person

{

    /**

     * @ORM\Id

     * @ORM\GeneratedValue

     * @ORM\Column(type="integer")

     */

    private $id;



    /**

     * @ORM\Column(type="string", length=50)

     */

    private $name;



    /**

     * @ORM\Column(type="string", length=50)

     */

    private $firstname;



    /**

     * @ORM\Column(type="string", length=255)

     */

    private $birthdaydate;



    /**

     * @ORM\Column(type="string", length=255)

     */

    private $gender;



    /** 

     * @ManyToMany(targetEntity="Person")

     * @JoinTable(name="family",

     *      joinColumns={@JoinColumn(name="person__id", referencedColumnName="person__id")},

     *      inverseJoinColumns={@JoinColumn(name="family_id", referencedColumnName="person__id")}

     *      )

     */

    private $myFamily;

And now, I want to make a form in which I can add new Person, in a person.
I did a CollectionType, like symfony said, but when i want to print it to the page, I get a timeout because of an infinite loop.

It's the "allow_add" which causes the problem.

And i need the prototype variable returned by "allow_add" to add new field in the front.

class PersonType extends AbstractType

{

    public function buildForm(FormBuilderInterface $builder, array $options): void

    {

        $builder

            ->add('name', TextType::class,  ['attr' => ['class' => 'form_textfield']])

            ->add('firstname')

            ->add('birthdayDate', TextType::class,  ['attr' => ['class' => 'form_datetime']])

            ->add('gender', GenderType::class)

            ->add('submit', SubmitType::class)

            ->add('myFamily', CollectionType::class, array('entry_type' => PersonType::class, 'mapped' => false, 'allow_add' => true, 'by_reference' => false, 'allow_delete' => true));

    }



    public function configureOptions(OptionsResolver $resolver): void

    {

        $resolver->setDefaults([

            'data_class' => Person::class,

        ]);

    }

}

Here is my form, but there is nothing interesting, I will add the js necessary when i will be resolve this problem.

{% extends 'base.html.twig' %}



{% block title %}Hello PersonController!

{% endblock %}



{% block body %}

    {{ form_start(form) }}

    {{ form_row(form.name) }}

    {{ form_row(form.firstname) }}

    {{ form_row(form.birthdayDate) }}

    {{ form_row(form.gender) }}

{{ form_row(form.myFamily) }}

    <button type="button" class="add_item_link" data-collection-holder-class="tags">Add a tag</but

    {{ form_end(form) }}

{% endblock %}

Thanks everyone in advance.

---

My Answer:
that references itself. For example, let's say I have an entity called "Category" and each category can have a parent category (which is also a category).

To achieve this, you can create a form type for the Category entity and use a EntityType field to reference the parent category. Here's an example of how you can do this:

1. Create a Category entity with a property for the parent category:

php
// src/Entity/Category.php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
* @ORM\Entity
*/
class Category
{
/**
* @ORM\Id
* @ORM\GeneratedValue
* @ORM\Column(type="integer")
*/
private $id;

/**
* @ORM\Column(type="string")
*/
private $name;

/**
* @ORM\ManyToOne(targetEntity="Category", inversedBy="children")
*/
private $parent;

/**
* @ORM\OneToMany(targetEntity="Category", mappedBy="parent")
*/
private $children;

// Getters and setters
}


2. Create a form type for the Category entity:

php
// src/Form/CategoryType.php

namespace App\Form;

use App\Entity\Category;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;

class CategoryType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name')
->add('parent', EntityType::class, [
'class' => Category::class,
'choice_label' => 'name',
'required' => false,
]);
}

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


3. Use the CategoryType form in your controller to create and handle the form:

php
// src/Controller/CategoryController.php

namespace App\Controller;

use App\Entity\Category;
use App\Form\CategoryType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class CategoryController extends AbstractController
{
/**
* @Route("/category/new", name="category_new")
*/
public function new(Request $request): Response
{
$category = new Category();
$form = $this->createForm(CategoryType::class, $category);

$form->handleRequest($request);

if ($form->isSubmitted() && $form->isValid()) {
$entityManager = $this->getDoctrine()->getManager();
$entityManager->persist($category);
$entityManager->flush();

return $this->redirectToRoute('category_new');
}

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


4. Create a template to render the form:

twig
{# templates/category/new.html.twig #}

{% extends 'base.html.twig' %}

{% block body %}

Create a new category

{{ form_start(form) }}
{{ form_row(form.name) }}
{{ form_row(form.parent) }}
Save
{{ form_end(form) }}
{% endblock %}


With this setup, you should be able to create a form for the Category entity that references itself for the parent category. You can then use this form in your controller to create new categories with parent categories.