ApiPlatform\Core\Bridge\Symfony\Routing\OperationMethodResolver::getRouteName PHP Method

    private function getRouteName(ResourceMetadata $resourceMetadata, string $operationName, bool $collection)
    {
        if ($collection) {
            return $resourceMetadata->getCollectionOperationAttribute($operationName, 'route_name');
        }
        return $resourceMetadata->getItemOperationAttribute($operationName, 'route_name');
    }