Allow bulk-edit for ReturnOrderLineItem (#12635)

* Allow bulk-edit for ReturnOrderLineItem

- Allow bulk change of line item outcome

* Update API version documentation with pull request links

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,11 +1,14 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 530
+INVENTREE_API_VERSION = 531
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v531 -> 2026-08-13 : https://github.com/inventree/InvenTree/pull/12635
+    - Adds "bulk update" support for the ReturnOrderLineItem API endpoint
+
 v530 -> 2026-07-28 : https://github.com/inventree/InvenTree/pull/12487
     - Adds searching against ReportSnippet API endpoint
 

src/backend/InvenTree/order/api.py

@@ -1793,6 +1793,7 @@ class ReturnOrderLineItemOutputOptions(OutputConfiguration):
 
 class ReturnOrderLineItemList(
     ReturnOrderLineItemMixin,
+    BulkUpdateMixin,
     DataExportViewMixin,
     OutputOptionsMixin,
     ListCreateDestroyAPIView,

src/backend/InvenTree/order/test_api.py

@@ -3716,6 +3716,42 @@ class ReturnOrderLineItemTests(InvenTreeAPITestCase):
 
         self.assertEqual(models.ReturnOrderLineItem.objects.count(), n - 1)
 
+    def test_bulk_update(self):
+        """Test that we can bulk update the 'outcome' field for multiple ReturnOrderLineItems via the API."""
+        ro = models.ReturnOrder.objects.get(pk=6)
+
+        # Create some extra line items against the same order, so we have multiple to update
+        models.ReturnOrderLineItem.objects.bulk_create([
+            models.ReturnOrderLineItem(order=ro, item_id=1006, quantity=1),
+            models.ReturnOrderLineItem(order=ro, item_id=1007, quantity=1),
+        ])
+
+        items = list(
+            models.ReturnOrderLineItem.objects.filter(order=ro).values_list(
+                'pk', flat=True
+            )
+        )
+
+        self.assertEqual(len(items), 3)
+
+        for line in models.ReturnOrderLineItem.objects.filter(pk__in=items):
+            self.assertEqual(line.outcome, ReturnOrderLineStatus.PENDING)
+
+        url = reverse('api-return-order-line-list')
+
+        data = {'items': items, 'outcome': ReturnOrderLineStatus.REPAIR.value}
+
+        # Update should fail without the correct role
+        self.patch(url, data, expected_code=403)
+
+        self.assignRole('return_order.change')
+
+        response = self.patch(url, data, expected_code=200).data
+        self.assertEqual(len(response['items']), 3)
+
+        for line in models.ReturnOrderLineItem.objects.filter(pk__in=items):
+            self.assertEqual(line.outcome, ReturnOrderLineStatus.REPAIR.value)
+
     def test_extra_line_bulk_delete(self):
         """Test that we can bulk delete multiple ReturnOrderExtraLine items via the API."""
         ro = models.ReturnOrder.objects.first()