/**
* Returns sortable properties by listing
* @return array
*/
private function getSortableProperties()
{
$emptyListing = new SJB_Listing(array(), $this->listingTypeSID);
$emptyListing->addPicturesProperty();
$emptyListing->addIDProperty();
$emptyListing->addListingTypeIDProperty();
$emptyListing->addActivationDateProperty();
$emptyListing->addNumberOfViewsProperty();
$emptyListing->addApplicationsProperty();
$emptyListing->addSubuserProperty();
$emptyListing->addActiveProperty();
$emptyListing->addExpirationDateProperty(null);
$sortableProperties = array();
$propertyList = $emptyListing->getPropertyList();
foreach ($propertyList as $property) {
$sortableProperties[$property]['is_sortable'] = true;
}
return $sortableProperties;
}