use the EntityType with text input - php

Question

I have created an EntityType form where you can add to your participation to an event the field and your position. Unfortunately the number and name of the fields is updated dynamically on the page so when creating the form, I don't have all the fields available (or worse some that doesn't exist anymore)
For simplicity I would like to use a simple textType, where my javascripts could enter an Id number and link the corresponding element from the db.
the code is very simple
class FieldPositionType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('position', EntityType::class, [
'class' => Position::class,
'choice_label' => 'name'
])
->add('field', EntityType::class, [
'class' => Field::class,
'choice_label' => 'id'
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Participation::class,
]);
}
}
but instead of EntityType, I would prefer TextType.
I imagine that I need to perform some modification on my setter but I have no clue how to transform an Id into a Entity as the EntityType does.

Answer 1

As suggested by Cerad, the dataTransformer was the solution.
So just for the position, I created a dataTransformer
class PositionToIdTransformer implements DataTransformerInterface
{
private $em;
public function __construct(EntityManagerInterface $em)
{
$this->em = $em;
}
public function transform($position)
{
if (null === $position) {
return '';
}
return $position->getId();
}
public function reverseTransform($id)
{
if (!$id){
return;
}
$position = $this->em->getRepository(Position::class)->find($id);
if (null === $position){
throw new TransformationFailedException(sprintf("the position '%s' does not exist!", $id));
}
return $position;
}
}
that I use in my formBuilder:
class FieldPositionType extends AbstractType
{
private $pt; //PositionToIdTransformer
public function __construct(PositionToIdTransformer $pt)
{
$this->pt = $pt;
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('position', TextType::class)
;
$builder->get('position')->addModelTransformer($this->pt);
}
}
and it work like a charm!

Answer 2

Link for query builder: https://symfony.com/doc/current/reference/forms/types/entity.html#ref-form-entity-query-builder
As told in comment try using it. I can not halp you further because I do not see rest of your logic but to limit entries which are shown in entity field it looks like this:
$builder->add('users', EntityType::class, [
'class' => User::class,
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('u')
->orderBy('u.username', 'ASC');
},
'choice_label' => 'username',
]);