ParameterValidatorProvider::getProperty() fails when Parameter::getOpenApi() returns an array (e.g. DateFilter QueryParameter)

[pentiminax]

API Platform version(s) affected: 4.2.0

Description

When using a QueryParameter with a DateFilter, API Platform generates multiple OpenAPI parameters
(revisionDate[after], revisionDate[before], etc.).

In ParameterValidatorProvider::getProperty(), $parameter->getOpenApi() then returns an array of
ApiPlatform\OpenApi\Model\Parameter objects.

But the code assumes it's an object or null:

if ('deepObject' === $openApi?->getStyle()) {
    ...
}

This leads to a fatal error when the required parameter is missing:

Call to a member function getStyle() on array
vendor/api-platform/core/src/Symfony/Validator/State/ParameterValidatorProvider.php:122

How to reproduce

new QueryParameter(
   key: 'revisionDate',
   filter: new DateFilter(),
   required: true
),

Make a request withous specifying required parameter

Possible Solution

if (is_array($openApi)) {
            $match = null;
            foreach ($openApi as $oaParam) {
                if ($oaParam instanceof Parameter) {
                    if ($oaParam->getKey() === $key || str_starts_with($oaParam->getName(), $key.'[')) {
                        $match = $oaParam;
                        break;
                    }
                }
            }

            $openApi = $match ?? reset($openApi);
        }

Also setting "openApi: false" to the QueryParameter works

[soyuka]

Good catch thanks!