saveTaxRules example

$model = new $model();
        }
        if (!$model instanceof ModelEntity) {
            throw new RuntimeException('Model object could not be created correctly');
        }

        switch ($name) {
            case 'tax':
                if (!$model instanceof Tax) {
                    throw new RuntimeException(sprintf('Model object is not an instance of expected class "%s"', Tax::class));
                }
                $this->saveTaxRules($data, $model);

                return;

            case 'customerGroup':
                if (isset($data['discounts'])) {
                    if (!$model instanceof CustomerGroup) {
                        throw new RuntimeException(sprintf('Model object is not an instance of expected class "%s"', CustomerGroup::class));
                    }
                    $model->getDiscounts()->clear();
                    $manager->flush();
                    $discounts = [];