Magento 2.2 product collection doesn't return out of stock products

Question

Magento 2.2.* seems to make it very difficult to get out of stock products in a collection! I have the following code which works fine in Magento 2.0 and 2.1:

use Magento\Framework\View\Result\PageFactory;
use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;

class Index extends \Magento\Framework\App\Action\Action
{

public function __construct(
    \Magento\Framework\App\Action\Context $context,
    PageFactory $resultPageFactory,
    \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
    \Magento\Store\Model\StoreManagerInterface $storeManager,
    CollectionFactory $collectionFactory
) {
    parent::__construct($context);
    $this->resultJsonFactory = $resultJsonFactory;
    $this->resultPageFactory = $resultPageFactory;
    $this->_storeManager = $storeManager;
    $this->_collectionFactory = $collectionFactory;
}

public function execute()
{
    // should get ALL products including out of stock ones
    $collection = $this->_collectionFactory->create();

Now testing it on Magento 2.2.1 and 2.2.2, and it is only retrieving products which are in stock - does anyone know a way to work around this?

I have looked at the internal code for collections and can't find any obvious differences - Any info much appreciated as this is a very irritating change that they've made!

Answer 1

Here magento2 added this. Feel free to change it

<type name="Magento\Catalog\Model\ResourceModel\Product\Collection">
        <plugin name="add_stock_information" type="Magento\CatalogInventory\Model\AddStockStatusToCollection" />
    </type>

You can always disable it in your di.xml using this

plugin disabled: To disable a plugin, set this element to true. The default value is false. Use this property to disable core or third-party plugins in your di.xml file.

https://devdocs.magento.com/guides/v2.0/extension-dev-guide/plugins.html#declaring-a-plugin

Here is the file

vendor/magento/module-catalog-inventory/Model/AddStockStatusToCollection.php.

You can override and remove that.

EDIT

Even better there is a config option in magento 2.2

configuration->catalog->inventory->Display out of stock products