$return_boolean = $background_object->getNameList();
if ($return_boolean) {
echo json_encode($background_object->data());
} else {
echo 'Error getting background name list';
}
break;
case 'change_background':
$background_object = new Background();
$array_of_fields = (array) json_decode($request_json);
$background_object->change($array_of_fields, $request_id);
echo 'OK';
break;
case 'remove_background':
$background_object = new Background();
$background_object->remove($request_id);
echo 'OK';
break;
case 'add_track_type':
$track_type_object = new TrackType();
$array_of_fields = (array) json_decode($request_json);
// remove the db_id (first) item in the array since we're adding a new one to the database table
array_shift($array_of_fields);
$track_type_object->add($array_of_fields);
echo 'OK';
break;
case 'get_track_type':
$track_type_object = new TrackType();
$return_boolean = $track_type_object->get($request_id);
if ($return_boolean) {
echo json_encode($track_type_object->data());
