Cfrgtkky

How can I get to display elements in the EntityType control in the following way:

Group 1

parent

  - child

  -- second_child

  - child

  - child

  -- second_child

Group 2

  parent

   - child

   -- second_child

   ------third_child

parent

   - child

I have a table that has a relation to itself, this entity have the parent field which defines the parent and children field for next child elements, the level field which determines the depth of nesting.
I tried to manually fill in the array with the elements in such a structure but it did not write to the database:

$data = ;

$data = ['Group 1']['parent'] = $entityElement;

$data = ['Group 1']['- child'] = $entityElement->getChildren()[0];

$data = ['Group 1']['-- second_child'] = $entityElement->getChildren()[1];



->add('elements', ChoiceType::class, [



    'mapped' => false,

    'expanded' => false,

    'multiple' => true,



    'choices' => $options['elements'],

    'placeholder' => false,

])

I tryed create query for this but it's not working, the elements are mixed up even when I add addOrderBy('c.parent')

        ->add('elements', EntityType::class, [

            'class' => Category::class,

            'choice_label' => function($item) { return $item->getIndentName(); },

            'expanded' => false,

            'multiple' => true,

            'query_builder' => function (ElementRepository $er) {

                return $er->createQueryBuilder('e')->groupBy('e.parent');

            },

            'group_by' => function ($choiceValue) {

                if (is_null($choiceValue->getBrand())) {

                    return '';

                }

                return $choiceValue->getBrand()->getName();

            },

        ])

How should I do that ?