We have upgraded our project to Symfony 4.4.35 2 months ago and now I noticed a strange behavior. When I use ChoiceType with the following configuration, the form returns error (This value is not valid):
JavaScript
x
$builder->add('items', ChoiceType::class, [
'required' => FALSE,
'multiple' => TRUE,
]);
$builder->get('items')->resetViewTransformers();
The POST:
JavaScript
form[items][0]: "val1"
form[items][1]: "val2"
Can someone tell me what has changed? I have tried to inspect ChoiceType.php, and find out the problem is here:
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$builder->addEventListener(FormEvents::POST_SUBMIT, function (FormEvent $event) use (&$unknownValues, $messageTemplate) {
if (count($unknownValues) > 0) {
// here is append error to form
}
});
The question is: How to create multiselect with variable length and custom values?
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Answer
I had to use SymfonyComponentFormExtensionCoreTypeCollectionType
with option allow_add
.
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$builder->add('items', CollectionType::class, [
'allow_add' => TRUE,
]);