Disabled attribute for sold out products

Helper/Data.php

@@ -0,0 +1,111 @@
+<?php
+
+namespace Interjar\ConfigurableChildVisibility\Helper;
+
+use Magento\Catalog\Model\Product;
+use Magento\ConfigurableProduct\Helper\Data as ParentHelperData;
+
+/**
+ * Class Data
+ * Helper class for getting options
+ * @api
+ * @since 100.0.2
+ */
+class Data extends ParentHelperData
+{
+    /**
+     * Catalog Image Helper
+     *
+     * @var \Magento\Catalog\Helper\Image
+     */
+    protected $imageHelper;
+
+    /**
+     * @param \Magento\Catalog\Helper\Image $imageHelper
+     */
+    public function __construct(\Magento\Catalog\Helper\Image $imageHelper)
+    {
+        $this->imageHelper = $imageHelper;
+    }
+
+    /**
+     * Retrieve collection of gallery images
+     *
+     * @param \Magento\Catalog\Api\Data\ProductInterface $product
+     * @return \Magento\Catalog\Model\Product\Image[]|null
+     */
+    public function getGalleryImages(\Magento\Catalog\Api\Data\ProductInterface $product)
+    {
+        $images = $product->getMediaGalleryImages();
+        if ($images instanceof \Magento\Framework\Data\Collection) {
+            foreach ($images as $image) {
+                /** @var $image \Magento\Catalog\Model\Product\Image */
+                $image->setData(
+                    'small_image_url',
+                    $this->imageHelper->init($product, 'product_page_image_small')
+                        ->setImageFile($image->getFile())
+                        ->getUrl()
+                );
+                $image->setData(
+                    'medium_image_url',
+                    $this->imageHelper->init($product, 'product_page_image_medium_no_frame')
+                        ->setImageFile($image->getFile())
+                        ->getUrl()
+                );
+                $image->setData(
+                    'large_image_url',
+                    $this->imageHelper->init($product, 'product_page_image_large_no_frame')
+                        ->setImageFile($image->getFile())
+                        ->getUrl()
+                );
+            }
+        }
+
+        return $images;
+    }
+
+    /**
+     * Get Options for Configurable Product Options
+     *
+     * @param \Magento\Catalog\Model\Product $currentProduct
+     * @param array $allowedProducts
+     * @return array
+     */
+    public function getOptions($currentProduct, $allowedProducts)
+    {
+        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
+        $stockRegistry = $objectManager->get('Magento\CatalogInventory\Api\StockRegistryInterface');
+
+        $options = [];
+        $allowAttributes = $this->getAllowAttributes($currentProduct);
+
+        foreach ($allowedProducts as $product) {
+            $productId = $product->getId();
+
+            $product = $objectManager->get('Magento\Catalog\Model\Product')->load($productId);
+            $stockitem = $stockRegistry->getStockItem($product->getId(), $product->getStore()->getWebsiteId());
+            if($stockitem->getQty() == 0) continue;
+
+            foreach ($allowAttributes as $attribute) {
+                $productAttribute = $attribute->getProductAttribute();
+                $productAttributeId = $productAttribute->getId();
+                $attributeValue = $product->getData($productAttribute->getAttributeCode());
+
+                $options[$productAttributeId][$attributeValue][] = $productId;
+                $options['index'][$productId][$productAttributeId] = $attributeValue;
+            }
+        }
+        return $options;
+    }
+
+    /**
+     * Get allowed attributes
+     *
+     * @param \Magento\Catalog\Model\Product $product
+     * @return array
+     */
+    public function getAllowAttributes($product)
+    {
+        return $product->getTypeInstance()->getConfigurableAttributes($product);
+    }
+}

etc/di.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <preference for="Magento\ConfigurableProduct\Model\Product\Type\Collection\SalableProcessor" type="Interjar\ConfigurableChildVisibility\Model\Product\Type\Configurable\Collection\SalableProcessor" />
+	<preference for="Magento\ConfigurableProduct\Helper\Data" type="Interjar\ConfigurableChildVisibility\Helper\Data" />
+
     <type name="Magento\ConfigurableProduct\Model\ResourceModel\Product\LinkedProductSelectBuilder">
         <arguments>
             <argument name="baseSelectProcessor" xsi:type="object">Interjar\ConfigurableChildVisibility\Model\ResourceModel\Product\StockStatusBaseSelectProcessor</argument>