Added RackGroup slug filter

netbox/dcim/filters.py

@@ -47,6 +47,12 @@ class RackFilter(django_filters.FilterSet):
         queryset=RackGroup.objects.all(),
         label='Group (ID)',
     )
+    group = django_filters.ModelMultipleChoiceFilter(
+        name='group',
+        queryset=RackGroup.objects.all(),
+        to_field_name='slug',
+        label='Group',
+    )
 
     class Meta:
         model = Rack