I'm finding inconsistent documentation on how to update product stock for M2 2.4.1.

Magento\Catalog\Model\Product::setStockData is documented in code to be deprecated and points to Magento\CatalogInventory\Api\Data\StockItemInterface.

StockItemInterface in turn is documented in code to be deprecated and links to pages https://devdocs.magento.com/guides/v2.3/inventory/index.html and https://devdocs.magento.com/guides/v2.3/inventory/catalog-inventory-replacements.html, which are obviously out of date.

Going to the latest page, https://devdocs.magento.com/guides/v2.4/inventory/inventory-api-reference.html, points to Magento\CatalogInventory\Api\StockRepositoryInterface, along with a bunch of other APIs, which is also documented to be deprecated and says "Replaced with Multi Source Inventory".

What is the proper way to programmatically update stock on 2.4?


In order to use the new API to update stock, add this to the constructor:

public function __construct(
    \Magento\InventoryApi\Api\SourceItemsSaveInterface $sourceItemsSaveInterface,
    \Magento\InventoryApi\Api\Data\SourceItemInterfaceFactory $sourceItemFactory,
) {
    $this->sourceItemsSaveInterface = $sourceItemsSaveInterface;
    $this->sourceItemFactory = $sourceItemFactory;

Updating the quantity looks like this:

$sourceItem = $this->sourceItemFactory->create();

Source link: https://www.czettner.com/2020/08/24/magento-2-3-update-stock-multi-source.html

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