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();