public function _ruleType($from, $to, $action)
{
switch ($action) {
case static::ACT_CONVERT_TO_OBJECT:
/* @var $from Entity\FarmRoleScalingMetric */
$to->ruleType = static::getRuleType($from->metric->alias);
break;
case static::ACT_CONVERT_TO_ENTITY:
break;
case static::ACT_GET_FILTER_CRITERIA:
return [[]];
}
}