Allow add new entities in AssociationField

[michaelKaefer]

• Closes https://github.com/EasyCorp/EasyAdminBundle/issues/3523 (which was already closed but it seems that it should not have been closed)
• Closes https://github.com/EasyCorp/EasyAdminBundle/issues/3646
• Closes https://github.com/EasyCorp/EasyAdminBundle/issues/5267
• Closes https://github.com/EasyCorp/EasyAdminBundle/issues/4065

An example for having an association from a product to categories, where the user can add new, not yet existing categories in the autocomplete select input which are persisted by the entity manager:

class ProductCrudController extends AbstractCrudController
{
    private EntityManagerInterface $entityManager;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->entityManager = $entityManager;
    }

    public static function getEntityFqcn(): string
    {
        return Product::class;
    }

    public function configureFields(string $pageName): iterable
    {
        return [
            AssociationField::new('categories')
                // $datas is something like: ['T-Shirts', 'Sweaters'] - whatever the user types in
                ->autocomplete(function (array $datas, Product $product) {
                    foreach ($datas as $data) {
                        $category = (new Category())
                            ->setTitle($data)
                            ->setLocale($product->getLocale());
                        $this->entityManager->persist($category);
                        $product->addCategory($category);
                    }
                }),
        ];
    }
}

I created a reproducer: https://github.com/michaelKaefer/ea-reproducer/tree/feature/add-new-button-in-association-field

[michaelKaefer]

@javiereguiluz This is finished from my side :) But as always there is no need to hurry!

[alyjee]

Thanks for this contribution. A bit clarification - this will only be able to handle associated entities like Category in your case which only needs 1 property "title". It will not be able to handle associated entities with multiple properties?

[michaelKaefer]

@alyjee Yes, that's true. (But you could still define your custom format like "John Doe" and then parse the string into first name and last name on your own)

[alyjee]

@michaelKaefer thanks for the clarification.

[nurradityam]

@michaelKaefer hi, any recommended workaround for this scenario while waiting to be merged or added support for multiple properties? thanks

[bencagri]

A nice solution. May i ask why is this closed?