#21150 fix filterset UI performance

Adds support for PATCHing ConfigContext and ConfigContextProfile with
integer IDs for `data_source` and `data_file`.
Adds regression tests to validate assignment and API functionality.

Fixes #20933

netbox/core/api/serializers_/data.py

@@ -44,3 +44,4 @@ class DataFileSerializer(NetBoxModelSerializer):
             'id', 'url', 'display_url', 'display', 'source', 'path', 'last_updated', 'size', 'hash',
         ]
         brief_fields = ('id', 'url', 'display', 'path')
+        read_only_fields = ['path', 'last_updated', 'size', 'hash']

netbox/core/models/data.py

@@ -12,7 +12,7 @@ from django.core.validators import RegexValidator
 from django.db import models
 from django.urls import reverse
 from django.utils import timezone
-from django.utils.translation import gettext as _
+from django.utils.translation import gettext_lazy as _
 
 from netbox.constants import CENSOR_TOKEN, CENSOR_TOKEN_CHANGED
 from netbox.models import PrimaryModel
@@ -128,7 +128,9 @@ class DataSource(JobsMixin, PrimaryModel):
         # Ensure URL scheme matches selected type
         if self.backend_class.is_local and self.url_scheme not in ('file', ''):
             raise ValidationError({
-                'source_url': "URLs for local sources must start with file:// (or specify no scheme)"
+                'source_url': _("URLs for local sources must start with {scheme} (or specify no scheme)").format(
+                    scheme='file://'
+                )
             })
 
     def save(self, *args, **kwargs):

netbox/extras/api/serializers_/configcontexts.py

@@ -28,7 +28,7 @@ class ConfigContextProfileSerializer(PrimaryModelSerializer):
     )
     data_file = DataFileSerializer(
         nested=True,
-        read_only=True
+        required=False
     )
 
     class Meta:
@@ -143,7 +143,7 @@ class ConfigContextSerializer(OwnerMixin, ChangeLogMessageSerializer, ValidatedM
     )
     data_file = DataFileSerializer(
         nested=True,
-        read_only=True
+        required=False
     )
 
     class Meta:

netbox/extras/tests/test_api.py

@@ -1,4 +1,5 @@
 import datetime
+import hashlib
 
 from django.contrib.contenttypes.models import ContentType
 from django.urls import reverse
@@ -7,7 +8,7 @@ from rest_framework import status
 
 from core.choices import ManagedFileRootPathChoices
 from core.events import *
-from core.models import ObjectType
+from core.models import DataFile, DataSource, ObjectType
 from dcim.models import Device, DeviceRole, DeviceType, Manufacturer, Rack, Location, RackRole, Site
 from extras.choices import *
 from extras.models import *
@@ -731,6 +732,51 @@ class ConfigContextProfileTest(APIViewTestCases.APIViewTestCase):
         )
         ConfigContextProfile.objects.bulk_create(profiles)
 
+    def test_update_data_source_and_data_file(self):
+        """
+        Regression test: Ensure data_source and data_file can be assigned via the API.
+
+        This specifically covers PATCHing a ConfigContext with integer IDs for both fields.
+        """
+        self.add_permissions(
+            'core.view_datafile',
+            'core.view_datasource',
+            'extras.view_configcontextprofile',
+            'extras.change_configcontextprofile',
+        )
+        config_context_profile = ConfigContextProfile.objects.first()
+
+        # Create a data source and file
+        datasource = DataSource.objects.create(
+            name='Data Source 1',
+            type='local',
+            source_url='file:///tmp/netbox-datasource/',
+        )
+        # Generate a valid dummy YAML file
+        file_data = b'profile: configcontext\n'
+        datafile = DataFile.objects.create(
+            source=datasource,
+            path='dir1/file1.yml',
+            last_updated=now(),
+            size=len(file_data),
+            hash=hashlib.sha256(file_data).hexdigest(),
+            data=file_data,
+        )
+
+        url = self._get_detail_url(config_context_profile)
+        payload = {
+            'data_source': datasource.pk,
+            'data_file': datafile.pk,
+        }
+        response = self.client.patch(url, payload, format='json', **self.header)
+        self.assertHttpStatus(response, status.HTTP_200_OK)
+
+        config_context_profile.refresh_from_db()
+        self.assertEqual(config_context_profile.data_source_id, datasource.pk)
+        self.assertEqual(config_context_profile.data_file_id, datafile.pk)
+        self.assertEqual(response.data['data_source']['id'], datasource.pk)
+        self.assertEqual(response.data['data_file']['id'], datafile.pk)
+
 
 class ConfigContextTest(APIViewTestCases.APIViewTestCase):
     model = ConfigContext
@@ -812,6 +858,51 @@ class ConfigContextTest(APIViewTestCases.APIViewTestCase):
         rendered_context = device.get_config_context()
         self.assertEqual(rendered_context['bar'], 456)
 
+    def test_update_data_source_and_data_file(self):
+        """
+        Regression test: Ensure data_source and data_file can be assigned via the API.
+
+        This specifically covers PATCHing a ConfigContext with integer IDs for both fields.
+        """
+        self.add_permissions(
+            'core.view_datafile',
+            'core.view_datasource',
+            'extras.view_configcontext',
+            'extras.change_configcontext',
+        )
+        config_context = ConfigContext.objects.first()
+
+        # Create a data source and file
+        datasource = DataSource.objects.create(
+            name='Data Source 1',
+            type='local',
+            source_url='file:///tmp/netbox-datasource/',
+        )
+        # Generate a valid dummy YAML file
+        file_data = b'context: config\n'
+        datafile = DataFile.objects.create(
+            source=datasource,
+            path='dir1/file1.yml',
+            last_updated=now(),
+            size=len(file_data),
+            hash=hashlib.sha256(file_data).hexdigest(),
+            data=file_data,
+        )
+
+        url = self._get_detail_url(config_context)
+        payload = {
+            'data_source': datasource.pk,
+            'data_file': datafile.pk,
+        }
+        response = self.client.patch(url, payload, format='json', **self.header)
+        self.assertHttpStatus(response, status.HTTP_200_OK)
+
+        config_context.refresh_from_db()
+        self.assertEqual(config_context.data_source_id, datasource.pk)
+        self.assertEqual(config_context.data_file_id, datafile.pk)
+        self.assertEqual(response.data['data_source']['id'], datasource.pk)
+        self.assertEqual(response.data['data_file']['id'], datafile.pk)
+
 
 class ConfigTemplateTest(APIViewTestCases.APIViewTestCase):
     model = ConfigTemplate

netbox/translations/en/LC_MESSAGES/django.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2026-01-13 05:05+0000\n"
+"POT-Creation-Date: 2026-01-15 05:05+0000\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -12489,8 +12489,8 @@ msgstr ""
 msgid "Delete Selected"
 msgstr ""
 
-#: netbox/netbox/plugins/navigation.py:55
-#: netbox/netbox/plugins/navigation.py:88
+#: netbox/netbox/plugins/navigation.py:53
+#: netbox/netbox/plugins/navigation.py:89
 msgid "Permissions must be passed as a tuple or list."
 msgstr ""
 
@@ -12498,7 +12498,7 @@ msgstr ""
 msgid "Buttons must be passed as a tuple or list."
 msgstr ""
 
-#: netbox/netbox/plugins/navigation.py:92
+#: netbox/netbox/plugins/navigation.py:95
 msgid "Button color must be a choice within ButtonColorChoices."
 msgstr ""
 

netbox/utilities/forms/mixins.py

@@ -188,13 +188,11 @@ class FilterModifierMixin:
             key = f'{model._meta.app_label}.{model._meta.model_name}'
             filterset_class = registry['filtersets'].get(key)
 
-        filterset = filterset_class() if filterset_class else None
-
         for field_name, field in self.fields.items():
             lookups = self._get_lookup_choices(field)
 
-            if filterset:
-                lookups = self._verify_lookups_with_filterset(field_name, lookups, filterset)
+            if filterset_class:
+                lookups = self._verify_lookups_with_filterset(field_name, lookups, filterset_class)
 
                 if len(lookups) > 1:
                     field.widget = FilterModifierWidget(
@@ -213,8 +211,14 @@ class FilterModifierMixin:
 
         return []
 
-    def _verify_lookups_with_filterset(self, field_name, lookups, filterset):
-        """Verify which lookups are actually supported by the FilterSet."""
+    def _verify_lookups_with_filterset(self, field_name, lookups, filterset_class):
+        """Verify which lookups are actually supported by the FilterSet.
+
+        Args:
+            field_name: The name of the form field
+            lookups: List of (lookup_code, lookup_label) tuples to verify
+            filterset_class: The FilterSet class (not instance) to check against
+        """
         verified_lookups = []
 
         for lookup_code, lookup_label in lookups:
@@ -223,7 +227,7 @@ class FilterModifierMixin:
             else:
                 filter_key = f'{field_name}__{lookup_code}' if lookup_code != 'exact' else field_name
 
-            if filter_key in filterset.filters:
+            if filter_key in filterset_class.base_filters:
                 verified_lookups.append((lookup_code, lookup_label))
 
         return verified_lookups