Limit tags by object type during assignment

netbox/extras/filtersets.py

@@ -258,10 +258,9 @@ class TagFilterSet(ChangeLoggedModelFilterSet):
     content_type_id = MultiValueNumberFilter(
         method='_content_type_id'
     )
-    object_type_id = MultiValueNumberFilter(
-        field_name='object_types__id'
+    for_object_type_id = MultiValueNumberFilter(
+        method='_for_object_type'
     )
-    object_types = ContentTypeFilter()
 
     class Meta:
         model = Tag
@@ -302,6 +301,11 @@ class TagFilterSet(ChangeLoggedModelFilterSet):
 
         return queryset.filter(extras_taggeditem_items__content_type__in=content_types).distinct()
 
+    def _for_object_type(self, queryset, name, values):
+        return queryset.filter(
+            Q(object_types__id__in=values) | Q(object_types__isnull=True)
+        )
+
 
 class ConfigContextFilterSet(ChangeLoggedModelFilterSet):
     q = django_filters.CharFilter(

netbox/extras/forms/filtersets.py

@@ -245,7 +245,7 @@ class TagFilterForm(SavedFiltersMixin, FilterForm):
         required=False,
         label=_('Tagged object type')
     )
-    object_type_id = ContentTypeMultipleChoiceField(
+    for_object_type_id = ContentTypeChoiceField(
         queryset=ContentType.objects.filter(FeatureQuery('tags').get_query()),
         required=False,
         label=_('Allowed object type')

netbox/netbox/forms/base.py

@@ -31,6 +31,13 @@ class NetBoxModelForm(BootstrapMixin, CustomFieldsMixin, forms.ModelForm):
         required=False
     )
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Limit tags to those applicable to the object type
+        if ct := self._get_content_type():
+            self.fields['tags'].widget.add_query_param('for_object_type_id', ct.pk)
+
     def _get_content_type(self):
         return ContentType.objects.get_for_model(self._meta.model)