ChoiceType multiple = true, expanded = false throws a TransformationFailedException [2.8] #24107
Description
| Q | A |
|---|---|
| Bug report? | yes |
| Feature request? | no |
| BC Break report? | no |
| RFC? | no |
| Symfony version | 2.8.27 |
Related : #21267
I have a custom Type (LocationType), extending ChoiceType which loads a (translated) list of locations from the Database. Which worked fine so far. Now I want to update this type to support multiple selections.
'multiple' => true,
'expanded' => false,
The configureOptions of the LocationType :
public function configureOptions(OptionsResolver $resolver)
{
parent::configureOptions($resolver);
if ($this->requestStack) {
if ($request = $this->requestStack->getCurrentRequest()) {
$this->locale = RequestUtils::getLocale($request);
}
}
$choiceList = $this->getChoiceList();
$choices = $choiceList->getChoices();
$resolver->setDefaults([
'choices' => $choices,
'disabled' => empty($choices),
'choices_as_values' => true,
'choice_label' => function ($value, $key, $index) use ($choiceList) {
return $choiceList->getLabel($key);
},
]);
}
$choices contains :
'Tokyo' => 'tokyo',
'Osaka' => 'osaka',
'Nagoya' => 'nagoya',
When submitting the form with values, I get a validation error and after some debugging, I found the submitted data is stuctured as a nested array.
Which throws an exception in ChoiceType :
// To avoid issues when the submitted choices are arrays (i.e. array to string conversions),
// we have to ensure that all elements of the submitted choice data are NULL, strings or ints.
$builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
$data = $event->getData();
if (!is_array($data)) {
return;
}
foreach ($data as $v) {
if (null !== $v && !is_string($v) && !is_int($v)) {
throw new TransformationFailedException('All choices submitted must be NULL, strings or ints.');
}
}
}, 256);
This only happens when using the select tag (with multiple attribute). When setting 'expanded' = true and using the checkboxes, there is no problem.
When checking the HTML code, the name attribute contains 2 square brackets :
name="JobType[location][][]"
Using dom editor changing this to
name="JobType[location][]"
allows the form to be submitted successfully and the values saved.
I've been trying to figure this one out for a few hours now, searching the web for answers, and I hope I'm correct here.