add wate to inventory

backend/controllers/ProductController.php

@@ -2,6 +2,7 @@
 
 namespace backend\controllers;
 
+use common\models\Log;
 use Yii;
 use common\models\Product;
 use backend\models\ProductSearch;
@@ -117,8 +118,19 @@ class ProductController extends \backend\controllers\BackendController
 
         $accounts = Account::readAccounts($model->id_account);
         $categories = ProductCategory::read($model->id_product_category);
-        
+
+        $stockOriginal = $model->stock;
         if ($model->load(Yii::$app->request->post()) && $model->save()) {
+
+            $stockUpdated = $model->stock;
+
+            $message = "Update product. Stock: " . $stockOriginal . " -> " . $stockUpdated;
+            Log::log([
+                'type' =>Log::$TYPE_CRUD,
+                'message' => $message,
+                'id_product' => $model->id_product
+            ]);
+
             return $this->redirect(['view', 'id' => $model->id_product]);
         } else {
             return $this->render('update', [