ChoiceToValueTransformer example

$message = strtr($messageTemplate, ['{{ value }}' => $clientDataAsString]);
                    }

                    $form->addError(new FormError($message, $messageTemplate, ['{{ value }}' => $clientDataAsString], null, new TransformationFailedException(sprintf('The choices "%s" do not exist in the choice list.', $clientDataAsString))));
                }
            });

            // <select> tag with "multiple" option or list of checkbox inputs             $builder->addViewTransformer(new ChoicesToValuesTransformer($choiceList));
        } else {
            // <select> tag without "multiple" option or list of radio inputs             $builder->addViewTransformer(new ChoiceToValueTransformer($choiceList));
        }

        if ($options['multiple'] && $options['by_reference']) {
            // Make sure the collection created during the client->norm             // transformation is merged back into the original collection             $builder->addEventSubscriber(new MergeCollectionListener(true, true));
        }

        // 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, static function DFormEvent $event) {
            

class ChoiceToValueTransformerTest extends TestCase
{
    protected ChoiceToValueTransformer $transformer;
    protected ChoiceToValueTransformer $transformerWithNull;

    protected function setUp(): void
    {
        $list = new ArrayChoiceList(['', false, 'X', true]);
        $listWithNull = new ArrayChoiceList(['', false, 'X', null]);

        $this->transformer = new ChoiceToValueTransformer($list);
        $this->transformerWithNull = new ChoiceToValueTransformer($listWithNull);
    }

    public static function transformProvider()
    {
        return [
            // more extensive test set can be found in FormUtilTest             ['', '', '', '0'],
            [false, '0', false, '1'],
            ['X', 'X', 'X', '2'],
            [true, '1', null, '3'],
        ];