On order filter (#12476)

* Add "on order" filter for Part model

- Added API filter
- Added table filter
- Added table column

* Bump API version

* Add table sorting

* Adjust API text

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,11 +1,15 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 528
+INVENTREE_API_VERSION = 529
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v529 -> 2026-07-26 : https://github.com/inventree/InvenTree/pull/12471
+    - Adds "on_order" filter to the Part API
+    - Enable sorting by "ordering" quantity on the Part API endpoint
+
 v528 -> 2026-07-26 : https://github.com/inventree/InvenTree/pull/12469
     - Additional ordering options for SalesOrderAllocation API endpoint
 

src/backend/InvenTree/part/api.py

@@ -784,6 +784,15 @@ class PartFilter(FilterSet):
             return queryset.filter(Q(unallocated_stock__gt=0))
         return queryset.filter(Q(unallocated_stock__lte=0))
 
+    # on_order filter
+    on_order = rest_filters.BooleanFilter(label='On order', method='filter_on_order')
+
+    def filter_on_order(self, queryset, name, value):
+        """Filter by whether the Part has any stock on order."""
+        if str2bool(value):
+            return queryset.filter(Q(ordering__gt=0))
+        return queryset.filter(Q(ordering__lte=0))
+
     convert_from = rest_filters.ModelChoiceFilter(
         label='Can convert from',
         queryset=Part.objects.all(),
@@ -1096,6 +1105,7 @@ class PartList(
         'name',
         'creation_date',
         'IPN',
+        'ordering',
         'in_stock',
         'total_in_stock',
         'unallocated_stock',

src/backend/InvenTree/part/test_api.py

@@ -2782,6 +2782,25 @@ class PartAPIAggregationTest(InvenTreeAPITestCase):
             # The annotated quantity must also match the part.on_order quantity
             self.assertEqual(on_order, p.on_order)
 
+        # Test the 'on_order' filter
+        response = self.get(
+            reverse('api-part-list'),
+            {'category': paint.pk, 'on_order': True},
+            expected_code=200,
+        )
+
+        for item in response.data:
+            self.assertGreater(item['ordering'], 0)
+
+        response = self.get(
+            reverse('api-part-list'),
+            {'category': paint.pk, 'on_order': False},
+            expected_code=200,
+        )
+
+        for item in response.data:
+            self.assertLessEqual(item['ordering'], 0)
+
     def test_building(self):
         """Test the 'building' quantity annotations."""
         # Create a new "buildable" part