How to track the changes of an order status programmatically?

dmitrii_fediuk · January 25, 2017, 7:34am

You should learn about events:

magento/magento2/blob/2.1.3/lib/internal/Magento/Framework/Model/AbstractModel.php#L792-L805


/**
 * Processing object after save data
 *
 * @return $this
 */
public function afterSave()
{
    $this->cleanModelCache();
    $this->_eventManager->dispatch('model_save_after', ['object' => $this]);
    $this->_eventManager->dispatch('clean_cache_by_tags', ['object' => $this]);
    $this->_eventManager->dispatch($this->_eventPrefix . '_save_after', $this->_getEventData());
    $this->updateStoredData();
    return $this;
}