Error at Symfony3 : Entity of type passed to the choice field must be managed

Question

When I upgraded the system running Symfony3.0 to version 3.4, the following error occured.
Since choice_list will not be supported due to version upgrade, choices I changed it to use.

Error Code

Entity of type "AppBundle\Model\Service\StaffService" passed to the choice field must be managed. Maybe you forget to persist it in the entity manager?

Code ArticleType.php

        // Contributor
        $authorChoiceList = array($this->staffService, $options['login_staff']);
       
        $builder->add("author", EntityType::class, array(
            "required" => true,
            "class" => "AhiSpCommonBundle:Staff",
            "choices" => $authorChoiceList,
            "placeholder" => "Please select",
        ));
        $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) use ($authorChoiceList) {
            $article = $event->getData();
            $authorChoiceList->setCurrentStaff($article->getAuthor());
        });

ChoiceList.php

use Symfony\Component\Form\ChoiceList\Factory\DefaultChoiceListFactory;
use Symfony\Component\Form\ChoiceList\LazyChoiceList;

class StaffChoiceList extends LazyChoiceList
{
    private $staffService;

    private $loginStaff;

    private $currentStaff;

    public function __construct($staffService, $loginStaff)
    {
        $this->staffService = $staffService;
        $this->loginStaff = $loginStaff;
    }

    public function setCurrentStaff($currentStaff)
    {
        $this->currentStaff = $currentStaff;
    }

    protected function loadChoiceList()
    {
        //Get the same shop staff as the login staff
        $staffs = $this->staffService->getStaffByShop($this->loginStaff->getShop());

        // If the current staff is not included in the acquired staff (due to transfer etc.), add it to the end
        if ($this->currentStaff && !array_search($this->currentStaff, $staffs)) {
            $staffs[] = $this->currentStaff;
        }
        $factory = new DefaultChoiceListFactory();
        return new ChoiceList($staffs, $staffs);
    }
}

Version
Cent OS 6.7 PHP 7.3 Symfony 3.4

Answer 1

can't you just use the query_builder option?

see doc here -> https://symfony.com/doc/current/reference/forms/types/entity.html#using-a-custom-query-for-the-entities

you could implement a custom method in the repository and call it inside you callable