How to convert the array correctly when submitting the form to the view?

Question

symfony

Tell me how to convert the array correctly when submitting the form to the Symfony view?

There are 2 entities: Chat and Group, they have a ManyToOne relationship. You need to make a view with the ability to edit the chat, and in it edit the group with which the chat has a connection. I made a form, cut it in the controller and passed it to the view, but the following error pops up:

Object of class Proxies\__CG__\App\Entity\Group could not be converted to string

In the form itself, if I comment on the line with group, then it's OK, but there is no way to edit the connecting group in this chat:

$builder
            ...
            ->add('group')

Answer 1

Either add a method \App\Entity\Group::__toStringor add a choice_label option

->add('group', null, [
    'choice_label' => 'getName', // Метод, который вернет название группы
])