yii2 afterSave memo

$insert = TRUE

 $changedAttributes = [
        'status' => null,
        'uuid' => null,
        'download_num' => null,
        'device_num' => null,
        'version_code' => null,
        'qr_url' => null,
        'agent_id' => null,
        'app_name' => null,
        'package_name' => null,
        'version' => null,
        'desc' => null,
        'ipa' => null,
        'icon' => null,
        'auth_code' => null,
        'create_time' => null,
        'update_time' => null,
        'id' => null,
    ],

The value of $ changedAttributes is the value before the update