Symfony Form Event add Error to specific field - php

Question

My scenario is the following:
If the user choose true from "maxRedemptionForDiscount" and type "0" into the "maxRedemptionForDiscountValue" there should be an error message rendering to the specific field (at the position of the TextType field)
This is the form with an eventListener:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add(
'maxRedemptionForDiscount',
ChoiceType::class,
[
'placeholder' => false,
'multiple' => false,
'choices' => [
true => 'discount.form_fields.set_max_redemptions',
false => 'discount.form_fields.unlimited',
],
'label' => 'discount.form_fields.max_redemption_for_discount',
'translation_domain' => 'entities',
'required' => false,
'error_bubbling' => true,
'attr' => [
'class' => 'maxRedemptionForDiscountSelect',
],
]
)->add(
'maxRedemptionForDiscountValue',
TextType::class,
[
'label' => 'discount.form_fields.set_max_redemptions',
'translation_domain' => 'entities',
'required' => false,
]
)->addEventListener(
FormEvents::PRE_SUBMIT,
[$this, 'onPreSubmit']
);
}
and this is the onPreSubmit function:
/**
* #param FormEvent $event
*/
public function onPreSubmit(FormEvent $event)
{
$data = $event->getData();
$form = $event->getForm();
if ($data['maxRedemptionForDiscount'] == 1) {
if ($data['maxRedemptionForDiscountValue'] == 0) {
$form->addError(new FormError('error message'));
}
}
$event->setData($data);
}
Here is the twig code:
{{ form_row(form.maxRedemptionForDiscount) }}
<div id="maxRedemptionForDiscountValue">
{{ form_row(form.maxRedemptionForDiscountValue) }}
</div>
This render a error message above the form.
But what I want i to render a error message to the specific field.
This does not work:
$form->get('maxRedemptionForDiscountValue')->addError(new FormError('error message'));
If I try this the error message will disappear at the top of my form, but not showing up at the specific field position.
What I am doing wrong here?

Answer 1

First, you should set error_bubbling to false (or remove it as it's default behavior).
As documentation states
If true, any errors for this field will be passed to the parent field or form. For example, if set to true on a normal field, any errors for that field will be attached to the main form, not to the specific field.
Particularly for ChoiceType
Set that error on this field must be attached to the field instead of the parent field (the form in most cases).
Second, you should add error to specific form field
$form
->get('maxRedemptionForDiscountValue')
->addError(new FormError('error message'));
Third, you should edit your template
<div id="maxRedemptionForDiscountValue">
{{ form_errors(form.maxRedemptionForDiscountValue) }}
{{ form_row(form.maxRedemptionForDiscountValue) }}
</div>