/**
* @return int
*/
static function upgradeManagementModel()
{
$change_column_num = 0;
foreach (ModelManager::getModels() as $k => $v) {
$model = new $v();
$change_column_num += $model->upgrade();
}
foreach (ModelManager::getModels() as $k => $v) {
$model = new $v();
$change_column_num += $model->addReference();
}
return $change_column_num;
}