first upload all files

Modules/Attribute/Listeners/SaveProductAttributes.php

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+<?php
+
+namespace Modules\Attribute\Listeners;
+
+use Modules\Product\Entities\Product;
+use Modules\Attribute\Entities\ProductAttributeValue;
+
+class SaveProductAttributes
+{
+    /**
+     * Handle the event.
+     *
+     * @param \Modules\Product\Entities\Product $product
+     * @return void
+     */
+    public function handle(Product $product)
+    {
+        $this->deleteProductAttributes($product);
+        $this->createProductAttributes($product);
+    }
+
+    /**
+     * Delete all product attributes associated with the given product.
+     *
+     * @param \Modules\Product\Entities\Product $product
+     * @return void
+     */
+    private function deleteProductAttributes(Product $product)
+    {
+        $product->attributes()->delete();
+    }
+
+    /**
+     * Create product attributes for the given product.
+     *
+     * @param \Modules\Product\Entities\Product $product
+     * @return void
+     */
+    private function createProductAttributes(Product $product)
+    {
+        $productAttributeValues = [];
+
+        foreach (request('attributes', []) as $attribute) {
+            $productAttribute = $product->attributes()->create([
+                'attribute_id' => $attribute['attribute_id'],
+            ]);
+
+            foreach ($attribute['values'] as $valueId) {
+                $productAttributeValues[] = [
+                    'product_attribute_id' => $productAttribute->id,
+                    'attribute_value_id' => $valueId,
+                ];
+            }
+        }
+
+        $this->createProductAttributeValues($productAttributeValues);
+    }
+
+    /**
+     * Create the given product attribute values.
+     *
+     * @param array $productAttributeValues
+     * @return void
+     */
+    private function createProductAttributeValues(array $productAttributeValues)
+    {
+        ProductAttributeValue::insert($productAttributeValues);
+    }
+}