Magento 2: Set product stock programmatically

Question

I have to setup Product 'in stock' and update Quantity programmatically. Here is my code I am trying:

$product->setData('is_in_stock', 1);
$product->setData('qty', 5);
$product->save();

Answer 1

Can you please try below code? It will save inventory data.

$product->setStockData(['qty' => $stockData, 'is_in_stock' => $stockData]);
$product->setQuantityAndStockStatus(['qty' => $stockData, 'is_in_stock' => $stockData]);
$product->save();

Answer 2

In Magento 2.3 was deprecated change stock directly via setStockData(...) Instead of it, you MUST use this way for updating product stock

1. Init product stock repository

    public function __construct(
        \Magento\InventoryApi\Api\StockRepositoryInterface $productStockRepository
    ) {
        $this->productStockRepository = $productStockRepository;
    }

2. Use Repository for product stock update

    $productStock = $productStockRepository->get($entity->getId());
    $productStock->setStockData(['is_in_stock' => false]);
    $productStockRepository->save($productStock);

In case if you don't use Multi Source Inventory (Magento_InventoryApi extesions), you can update product stock this way:

1. Init product stock registry

    public function __construct(
        \Magento\InventoryApi\Api\StockRepositoryInterface $productStockRepository
    ) {
        $this->productStockRepository = $productStockRepository;
    }

2. Get product stock item and change product stock

    $productStock = $productStockRegistry->getStockItem($entity->getId());
    $productStock = $productStockRepository->get($entity->getId());
    $productStock->setIsInStock(true);
    $productStock->setQty(10);
    $productStock->save();

Answer 3

Magento latest version uses the MSI inventory module for managing the inventory. Also providing provisions to create multiple inventory sources. By default, It will use the default source. If you want to set or update product stock then use the below code.

public function __construct(
    .....
    \Magento\InventoryCatalogApi\Model\SourceItemsProcessorInterface $sourceItemsProcessor
) {
    .....
    $this->sourceItemsProcessor = $sourceItemsProcessor;
}
public function execute()
{
    $data = [
        ['source_code'=>'default', 'status'=>1, 'quantity'=>50],
    ];
    
    $this->sourceItemsProcessor->execute(
        'your_sku',
        $data
    );
}

Answer 4

Other solutions are workable but they are deprecated.

So, You may follow the links below. I found these ones helpful.

https://magento.stackexchange.com/questions/325544/proper-way-to-update-stock-in-2-4
https://magento.stackexchange.com/questions/272296/how-to-set-qty-to-product-on-msi-magento-2-3