Adds "is_variant" filter for Part API (#9077)

* Adds "is_variant" filter for Part API

* Bump API version

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,13 +1,16 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 309
+INVENTREE_API_VERSION = 310
 
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 
 INVENTREE_API_TEXT = """
 
+v310 - 2025-02-14 : https://github.com/inventree/InvenTree/pull/9077
+    - Adds 'is_variant' filter to the Part list API
+
 v309 - 2025-02-02 : https://github.com/inventree/InvenTree/pull/9008
     - Bug fixes for the "Part" serializer
     - Fixes for data import API endpoints

src/backend/InvenTree/part/api.py

@@ -895,6 +895,14 @@ class PartFilter(rest_filters.FilterSet):
         model = Part
         fields = ['revision_of']
 
+    is_variant = rest_filters.BooleanFilter(
+        label=_('Is Variant'), method='filter_is_variant'
+    )
+
+    def filter_is_variant(self, queryset, name, value):
+        """Filter by whether the Part is a variant or not."""
+        return queryset.filter(variant_of__isnull=not str2bool(value))
+
     is_revision = rest_filters.BooleanFilter(
         label=_('Is Revision'), method='filter_is_revision'
     )

src/frontend/src/tables/part/PartTable.tsx

@@ -269,6 +269,12 @@ function partTableFilters(): TableFilter[] {
       description: t`Filter by parts which are templates`,
       type: 'boolean'
     },
+    {
+      name: 'is_variant',
+      label: t`Is Variant`,
+      description: t`Filter by parts which are variants`,
+      type: 'boolean'
+    },
     {
       name: 'is_revision',
       label: t`Is Revision`,