I try to access stock data for a product, using
$product->getExtensionAttributes()->getStockItem()->getIsInStock() and receive the following error on this line
PHP Fatal error: Call to a member function getIsInStock() on null.
Obviously the stock_item extension attribute was not loaded. $product comes from the product repository and has been loaded with $productRepository->getList().
How can I get products with stock information from the product repository?
Apparently this is not possible in a reasonable way as of Magento 2.1
You can use the stock registry and pass each item of the result to Magento\CatalogInventory\Helper\Stock::assignStatusToProduct().
But this results in a single database query for each product. In my tests with 2000 products, this takes three times longer than loading the collection directly with Magento\CatalogInventory\Model\ResourceModel\Stock\Status::addStockDataToCollection()
To optimize the stock registry, one would have to add a method to fetch multiple stock items at once and assign them to an array of products.
If you have access to the productRepository you can do this:
$this->_productRepository->getById($product->getId())->getExtensionAttributes()->getStockItem()->getIsInStock();
isInStock() on the items, since they'll always return 1, even if they're not in stock and you also can't use getStockData() since that'll return NULL. As far as I know stock data isn't included in the product list items. \Magento\CatalogInventory\Api\StockItemRepositoryInterface to just load the stock item seperately, like this: $this->_stockItemRepository->get($product->getQuantityAndStockStatus())->getIsInStock() getQuantityAndStockStatus define?