Add EmptyStringFilter and type__empty filter on CableFilterSet

netbox/dcim/filtersets.py

@@ -18,7 +18,7 @@ from tenancy.models import *
 from users.models import User
 from utilities.filters import (
     ContentTypeFilter, MultiValueCharFilter, MultiValueMACAddressFilter, MultiValueNumberFilter, MultiValueWWNFilter,
-    NumericArrayFilter, TreeNodeMultipleChoiceFilter,
+    NumericArrayFilter, TreeNodeMultipleChoiceFilter, EmptyStringFilter,
 )
 from virtualization.models import Cluster, ClusterGroup
 from vpn.models import L2VPN
@@ -1983,6 +1983,9 @@ class CableFilterSet(TenancyFilterSet, NetBoxModelFilterSet):
     type = django_filters.MultipleChoiceFilter(
         choices=CableTypeChoices
     )
+    type__empty = EmptyStringFilter(
+        field_name='type'
+    )
     status = django_filters.MultipleChoiceFilter(
         choices=LinkStatusChoices
     )

netbox/dcim/tests/test_filtersets.py

@@ -5245,6 +5245,12 @@ class CableTestCase(TestCase, ChangeLoggedFilterSetTests):
         params = {'type__empty': 'false'}
         self.assertEqual(self.filterset(params, self.queryset).qs.count(), 6)
 
+    def test_type_empty(self):
+        params = {'type__empty': 'true'}
+        self.assertEqual(self.filterset(params, self.queryset).qs.count(), 8)
+        params = {'type__empty': 'false'}
+        self.assertEqual(self.filterset(params, self.queryset).qs.count(), 6)
+
     def test_status(self):
         params = {'status': [LinkStatusChoices.STATUS_CONNECTED]}
         self.assertEqual(self.filterset(params, self.queryset).qs.count(), 11)

netbox/utilities/filters.py

@@ -171,3 +171,14 @@ class ContentTypeFilter(django_filters.CharFilter):
                 f'{self.field_name}__model': model
             }
         )
+
+
+class EmptyStringFilter(django_filters.BooleanFilter):
+    def filter(self, qs, value):
+        if value in EMPTY_VALUES:
+            return qs
+
+        exclude = self.exclude ^ (value is False)
+        method = qs.exclude if exclude else qs.filter
+
+        return method(**{self.field_name: ""})