How to get Creditmemo ID from sales_order_creditmemo_refund?

Question

If I observe sales_order_creditmemo_refund event, there’s no entity_id or increment_id data in the passed object. I presume those are added before the sales_order_creditmemo_safe_after event. However, if I use the latter, it fires even if I add comments to a previously saved credit memo.

Is there a way to distinguish whether the event is triggered after a freshly refunded credit memo or anything else, or to get Id from the _refund event?

Checking for a state is not an option as orders can have multiple credit memos.

Thank you!

Answer 1

You will have an entity_id only after the object has been saved to database, therefore the earliest event to get that value is sales_order_creditmemo_safe_after.

But an increment_id can be generated in an earlier phase - you just have to generate it by yourself. Automatically the increment_id is generated in the save bevore process of the ressource model but only if there is no value for increment_id.

So one approach for you requirement can be to create the increment_id in your observer in sales_order_creditmemo_refund like this:

if (!$creditmemo->getIncrementId()){
    $entityType = Mage::getModel('eav/entity_type')->loadByCode('creditmemo');
    $creditmemo->setIncrementId($entityType->fetchNewIncrementId($creditmemo->getStoreId()));
}
//from here you have an increment id
$creditmemo->getIncrementId();

You may also use sales_order_creditmemo_safe_after event and check if an increment_id or an entity_id has just been generated, by checking the getOrigData of the creditmemo. That may also work and you will fire the event only once for the newly generated creditmemo:

if ($creditmemo->getOrigData('increment_id') == null){
  //creditmemo has just been generated and saved to database so you have increment_id and entity_id
  $creditmemo->getId();
  $creditmemo->getIncrementId();
}

You can try both approaches and see which one is the best for you - I would prefer the second varaint since you are sure the creditmemo has been generated and saved to database.