Magento 2.4.1 Move Out of Stock In last Of Category Listing

Question

I want to move out of stock product in last of the category listing, itried below code but same seems not working.

app/code/Meetanshi/StockQuantity/etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
   <module name="Meetanshi_StockQuantity" setup_version="1.0.0"/>
</config>

app/code/Meetanshi/StockQuantity/etc/events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
   <event name="catalog_block_product_list_collection">
       <observer name="stockLast" instance="Meetanshi\StockQuantity\Observer\StockLast" />
   </event>
</config>

app/code/Meetanshi/StockQuantity/Observer/StockLast.php

<?php
namespace Meetanshi\StockQuantity\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Framework\Event\Observer;
use Magento\Catalog\Block\Product\ProductList\Toolbar as CoreToolbar;
class StockLast implements ObserverInterface
{
   protected $scopeConfig;
   protected $_storeManager;
   protected $coreToolbar;
   public function __construct(
       ScopeConfigInterface $scopeConfig,
       StoreManagerInterface $storeManager,
       CoreToolbar $toolbar
   )
   {
       $this->scopeConfig = $scopeConfig;
       $this->_storeManager = $storeManager;
       $this->coreToolbar = $toolbar;
   }
   public function execute(Observer $observer)
   {
       $collection = $observer->getEvent()->getData('collection');
       try {
           $websiteId = 0;
           $stockId = 'stock_id';
           $collection->getSelect()->joinLeft(
               array('_inv' => $collection->getResource()->getTable('cataloginventory_stock_status')),
               "_inv.product_id = e.entity_id and _inv.website_id=$websiteId",
               array('stock_status')
           );
           $collection->addExpressionAttributeToSelect('in_stock', 'IFNULL(_inv.stock_status,0)', array());
           $collection->getSelect()->reset('order');
           $collection->getSelect()->order('in_stock DESC');
           //code for Filter Price Low to High or High to Low with stock filter.
           if ($this->coreToolbar->getCurrentOrder() == 'price') {
               $direction = $this->coreToolbar->getCurrentDirection();
               $collection->getSelect()->order("min_price $direction");
           }
       } catch (\Exception $e) {
       }
       return $this;
   }
}

Answer 1

Since you cannot use the code above to apply to magento 2.4.x because Magento 2.4.x used ElasticSearch as default search engine.

Here I've created a sample module for your purpose

https://github.com/tuyennn/magento2-outofstockatlast

Hope this help.

Answer 2

Magento 2 move out of stock products to the end of category page, this solution is Elasticsearch base, suitable for 2.4.x versions. https://github.com/majidiyan/magento2-out-of-stock-move-end-category