I need to detect whenever the inventory level of a product changes. As there is cataloginventory_stock_item_save_after in magento 1.x wanto to implemet same in magento 2.1

<event name="cataloginventory_stock_item_save_after">
    <observer name="cataloginventorysave" instance="Vendor\Module\Observer\Cataloginventorysave" />

Then created observer "Cataloginventorysave.php" in which I want to access

$stockItem = $observer->getEvent()->getItem();

But event name cataloginventory_stock_item_save_after is not found in magento 2 event list. How will I achieve it.

1 Answer 1


This is a bug.

Basically those events are dispatched dynamically in Magento\Framework\Model\AbstractModel in the afterSave() method:

public function afterSave()
    $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());
    return $this;

As you can see, this code use $this->_eventPrefix to generate the name of the event.

But the problem with Magento\CatalogInventory\Model\Stock\Item is that this variable is not declared properly:

protected $eventPrefix = 'cataloginventory_stock_item';

See the problem ? It's missing an underscore, it should be:

protected $_eventPrefix = 'cataloginventory_stock_item';

I suggest you create a bug report here so the team is aware of it: https://github.com/magento/magento2/issues

After digging it, it seems like someone found the bug before us: https://github.com/magento/magento2/issues/4857

Please note that the PR has already been merged to the develop branch

  • thank you. it worked.. but now I want product id so I tried : $stockItem = $observer->getEvent()->getItem();
    – SPK
    Sep 16, 2016 at 6:09
  • 1
    $id = $stockItem->getProductId(); I got error: PHP Fatal error: Call to a member function getProductId() on null
    – SPK
    Sep 16, 2016 at 6:09
  • @SPK It requires a fix to the $_eventObject attribute name. Without this fix the event always passes the event data as 'Object' instead of the expected 'Stock' and 'Item'. Jul 14, 2017 at 10:02
  • is that event dispatched by an order or api? Jul 29, 2017 at 9:02
  • In this event any idea how to get the previous qty in Magento 1 getOrigData('qty') can be used for it.But it is not working in 2. Aug 10, 2017 at 4:28

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