API search field bug (#10108)

* Additional unit tests

* Fix search field

* Additional unit test to apply search term

* Bump API version

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,11 +1,15 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 375
+INVENTREE_API_VERSION = 376
 
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
+
+v376 -> 2025-08-01 : https://github.com/inventree/InvenTree/pull/10108
+    - Fix search fields for ReturnOrderLineItem API list endpoint
+
 v375 -> 2025-07-28 : https://github.com/inventree/InvenTree/pull/10095
     - Sorts searched fields to keep API stable
 

src/backend/InvenTree/order/api.py

@@ -1641,7 +1641,7 @@ class ReturnOrderLineItemList(
     ordering_fields = ['reference', 'target_date', 'received_date']
 
     search_fields = [
-        'item_serial',
+        'item__serial',
         'item__part__name',
         'item__part__description',
         'reference',

src/backend/InvenTree/order/test_api.py

@@ -2507,6 +2507,50 @@ class ReturnOrderTests(InvenTreeAPITestCase):
         calendar = Calendar.from_ical(response.content)
         self.assertIsInstance(calendar, Calendar)
 
+    def test_export(self):
+        """Test data export for the ReturnOrder API endpoints."""
+        # Export return orders
+        data = self.export_data(
+            reverse('api-return-order-list'),
+            export_format='csv',
+            decode=True,
+            expected_code=200,
+        )
+
+        self.process_csv(
+            data,
+            required_cols=['Reference', 'Customer'],
+            required_rows=models.ReturnOrder.objects.count(),
+        )
+
+        N = models.ReturnOrderLineItem.objects.count()
+        self.assertGreater(N, 0, 'No ReturnOrderLineItems found!')
+
+        # Export return order lines
+        data = self.export_data(
+            reverse('api-return-order-line-list'),
+            export_format='csv',
+            decode=True,
+            expected_code=200,
+        )
+
+        self.process_csv(
+            data, required_rows=N, required_cols=['Order', 'Reference', 'Target Date']
+        )
+
+        # Export again, with a search term
+        data = self.export_data(
+            reverse('api-return-order-line-list'),
+            params={'search': 'xyz'},
+            export_format='csv',
+            decode=True,
+            expected_code=200,
+        )
+
+        self.process_csv(
+            data, required_rows=0, required_cols=['Order', 'Reference', 'Target Date']
+        )
+
 
 class OrderMetadataAPITest(InvenTreeAPITestCase):
     """Unit tests for the various metadata endpoints of API."""