public function delete($commercialGroup)
{
if (is_string($commercialGroup)) {
$commercialGroup = new CommercialGroupModel(array('id' => $commercialGroup));
}
if (!$commercialGroup instanceof CommercialGroupModel) {
throw new AppEx\InvalidArgumentException('No supplied commericial group Id or model');
}
if (is_null($commercialGroup->getSubscriberCount())) {
$commercialGroup = $this->load($commercialGroup->getId());
}
if ($commercialGroup->getSubscriberCount() !== 0) {
throw new AppEx\InvalidArgumentException('Supplied commericial group has subscriptions');
}
return parent::delete($commercialGroup);
}
