Added Product ID to list of available Product Identifiers

Author: ihorvansach

Model/AbstractDataLayer.php

@@ -217,7 +217,7 @@ protected function getProductAttributeValue(Product $product, ?string $attribute
     {
         if ($attributeCode) {
             $result = $product->getData($attributeCode);
-            if (is_numeric($result) && 'sku' != $attributeCode) {
+            if (is_numeric($result) && !in_array($attributeCode, ['sku', 'entity_id'])) {
                 $result = $product->getResource()->getAttribute($attributeCode)->getFrontend()->getValue($product);
             }
 

Model/Config/Source/ProductAttribute.php

@@ -44,6 +44,11 @@ public function toOptionArray(): array
         if ($this->options === null) {
             $this->options = [];
 
+            $this->options[] = [
+                'value' => 'entity_id',
+                'label' => 'Product ID'
+            ];
+
             $attributeCollection = $this->attributeCollectionFactory->create();
             $attributeCollection->addVisibleFilter()
                 ->setOrder('frontend_label', 'ASC');