Allow bulk edit of stock batch code (#11499)

* Allow bulk edit of stock batch code

Closes https://github.com/inventree/InvenTree/issues/10817

* Bump API version

* Add unit test

src/backend/InvenTree/InvenTree/api.py

@@ -594,17 +594,24 @@ class BulkUpdateMixin(BulkOperationMixin):
 
         n = queryset.count()
 
+        instance_data = []
+
         with transaction.atomic():
             # Perform object update
             # Note that we do not perform a bulk-update operation here,
             # as we want to trigger any custom post_save methods on the model
+
+            # Run validation first
             for instance in queryset:
                 serializer = self.get_serializer(instance, data=data, partial=True)
-
                 serializer.is_valid(raise_exception=True)
                 serializer.save()
 
-        return Response({'success': f'Updated {n} items'}, status=200)
+                instance_data.append(serializer.data)
+
+        return Response(
+            {'success': f'Updated {n} items', 'items': instance_data}, status=200
+        )
 
 
 class ParameterListMixin:

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,11 +1,14 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 462
+INVENTREE_API_VERSION = 463
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v463 -> 2026-03-12 : https://github.com/inventree/InvenTree/pull/11499
+    - Allow "bulk update" actions against StockItem endpoint
+
 v462 -> 2026-03-12 : https://github.com/inventree/InvenTree/pull/11497
     - Allow "ScheduledTask" API endpoint to be filtered by "name" field
 

src/backend/InvenTree/stock/api.py

@@ -1050,7 +1050,11 @@ class StockOutputOptions(OutputConfiguration):
 
 
 class StockList(
-    DataExportViewMixin, StockApiMixin, OutputOptionsMixin, ListCreateDestroyAPIView
+    DataExportViewMixin,
+    BulkUpdateMixin,
+    StockApiMixin,
+    OutputOptionsMixin,
+    ListCreateDestroyAPIView,
 ):
     """API endpoint for list view of Stock objects.
 

src/backend/InvenTree/stock/test_api.py

@@ -2006,6 +2006,33 @@ class StockItemTest(StockAPITestCase):
             self.assertEqual(tracking.deltas['status'], StockStatus.OK.value)
             self.assertEqual(tracking.deltas['status_logical'], StockStatus.OK.value)
 
+    def test_bulk_batch_change(self):
+        """Test that we can bulk-change batch code for a set of stock items."""
+        url = reverse('api-stock-list')
+
+        # Find the first 10 stock items
+        items = StockItem.objects.all()[:10]
+        self.assertEqual(len(items), 10)
+
+        response = self.patch(
+            url,
+            data={'items': [item.pk for item in items], 'batch': 'NEW-BATCH-CODE'},
+            max_query_count=300,
+        )
+
+        data = response.data
+
+        self.assertEqual(data['success'], 'Updated 10 items')
+        self.assertEqual(len(data['items']), 10)
+
+        for item in data['items']:
+            self.assertEqual(item['batch'], 'NEW-BATCH-CODE')
+
+        # Check database items also
+        for item in items:
+            item.refresh_from_db()
+            self.assertEqual(item.batch, 'NEW-BATCH-CODE')
+
 
 class StocktakeTest(StockAPITestCase):
     """Series of tests for the Stocktake API."""