Odtnhj

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 ?