Pass user object to EventContext

* #20383 clear rack face if no rack on edit

* #20383 clear rack face if no rack on edit

* review changes

* review changes

.github/ISSUE_TEMPLATE/03-performance.yaml

@@ -0,0 +1,43 @@
+---
+name: 🏁 Performance
+type: Performance
+description: An opportunity to improve application performance
+labels: ["netbox", "type: performance", "status: needs triage"]
+body:
+  - type: input
+    attributes:
+      label: NetBox Version
+      description: What version of NetBox are you currently running?
+      placeholder: v4.5.1
+    validations:
+      required: true
+  - type: dropdown
+    attributes:
+      label: Python Version
+      description: What version of Python are you currently running?
+      options:
+        - "3.12"
+        - "3.13"
+        - "3.14"
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Area(s) of Concern
+      description: Which application interface(s) are affected?
+      options:
+        - label: User Interface
+        - label: REST API
+        - label: GraphQL API
+        - label: Python ORM
+        - label: Other
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Details
+      description: >
+        Describe in detail the operations being performed and the indications of a performance issue.
+        Include any relevant testing parameters, benchmarks, and expected results.
+    validations:
+      required: true

netbox/dcim/forms/model_forms.py

@@ -20,7 +20,9 @@ from utilities.forms.fields import (
     DynamicModelChoiceField, DynamicModelMultipleChoiceField, JSONField, NumericArrayField, SlugField,
 )
 from utilities.forms.rendering import FieldSet, InlineFields, TabbedGroups
-from utilities.forms.widgets import APISelect, ClearableFileInput, HTMXSelect, NumberWithOptions, SelectWithPK
+from utilities.forms.widgets import (
+    APISelect, ClearableFileInput, ClearableSelect, HTMXSelect, NumberWithOptions, SelectWithPK,
+)
 from utilities.jsonschema import JSONSchemaProperty
 from virtualization.models import Cluster, VMInterface
 from wireless.models import WirelessLAN, WirelessLANGroup
@@ -592,6 +594,14 @@ class DeviceForm(TenancyForm, PrimaryModelForm):
             },
         )
     )
+    face = forms.ChoiceField(
+        label=_('Face'),
+        choices=add_blank_choice(DeviceFaceChoices),
+        required=False,
+        widget=ClearableSelect(
+            requires_fields=['rack']
+        )
+    )
     device_type = DynamicModelChoiceField(
         label=_('Device type'),
         queryset=DeviceType.objects.all(),

netbox/extras/events.py

@@ -1,5 +1,5 @@
 import logging
-from collections import defaultdict
+from collections import UserDict, defaultdict
 
 from django.conf import settings
 from django.utils import timezone
@@ -12,7 +12,6 @@ from core.models import ObjectType
 from netbox.config import get_config
 from netbox.constants import RQ_QUEUE_DEFAULT
 from netbox.models.features import has_feature
-from users.models import User
 from utilities.api import get_serializer_for_model
 from utilities.request import copy_safe_request
 from utilities.rqworker import get_rq_retry
@@ -23,6 +22,19 @@ from .models import EventRule
 logger = logging.getLogger('netbox.events_processor')
 
 
+class EventContext(UserDict):
+    """
+    A custom dictionary that automatically serializes its associated object on demand.
+    """
+
+    def __getitem__(self, item):
+        if item == 'data' and 'data' not in self:
+            data = serialize_for_event(self['object'])
+            self.__setitem__('data', data)
+            return data
+        return super().__getitem__(item)
+
+
 def serialize_for_event(instance):
     """
     Return a serialized representation of the given instance suitable for use in a queued event.
@@ -66,37 +78,42 @@ def enqueue_event(queue, instance, request, event_type):
     assert instance.pk is not None
     key = f'{app_label}.{model_name}:{instance.pk}'
     if key in queue:
-        queue[key]['data'] = serialize_for_event(instance)
         queue[key]['snapshots']['postchange'] = get_snapshots(instance, event_type)['postchange']
         # If the object is being deleted, update any prior "update" event to "delete"
         if event_type == OBJECT_DELETED:
             queue[key]['event_type'] = event_type
     else:
-        queue[key] = {
-            'object_type': ObjectType.objects.get_for_model(instance),
-            'object_id': instance.pk,
-            'event_type': event_type,
-            'data': serialize_for_event(instance),
-            'snapshots': get_snapshots(instance, event_type),
-            'request': request,
+        queue[key] = EventContext(
+            object_type=ObjectType.objects.get_for_model(instance),
+            object_id=instance.pk,
+            object=instance,
+            event_type=event_type,
+            snapshots=get_snapshots(instance, event_type),
+            request=request,
+            user=request.user,
             # Legacy request attributes for backward compatibility
-            'username': request.user.username,
-            'request_id': request.id,
-        }
+            username=request.user.username,
+            request_id=request.id,
+        )
+    # Force serialization of objects prior to them actually being deleted
+    if event_type == OBJECT_DELETED:
+        queue[key]['data'] = serialize_for_event(instance)
 
 
-def process_event_rules(event_rules, object_type, event_type, data, username=None, snapshots=None, request=None):
-    user = User.objects.get(username=username) if username else None
+def process_event_rules(event_rules, object_type, event):
+    """
+    Process a list of EventRules against an event.
+    """
 
     for event_rule in event_rules:
 
         # Evaluate event rule conditions (if any)
-        if not event_rule.eval_conditions(data):
+        if not event_rule.eval_conditions(event['data']):
             continue
 
         # Compile event data
         event_data = event_rule.action_data or {}
-        event_data.update(data)
+        event_data.update(event['data'])
 
         # Webhooks
         if event_rule.action_type == EventRuleActionChoices.WEBHOOK:
@@ -109,25 +126,22 @@ def process_event_rules(event_rules, object_type, event_type, data, username=Non
             params = {
                 "event_rule": event_rule,
                 "object_type": object_type,
-                "event_type": event_type,
+                "event_type": event['event_type'],
                 "data": event_data,
-                "snapshots": snapshots,
+                "snapshots": event['snapshots'],
                 "timestamp": timezone.now().isoformat(),
-                "username": username,
+                "username": event['username'],
                 "retry": get_rq_retry()
             }
-            if snapshots:
-                params["snapshots"] = snapshots
-            if request:
+            if 'snapshots' in event:
+                params['snapshots'] = event['snapshots']
+            if 'request' in event:
                 # Exclude FILES - webhooks don't need uploaded files,
                 # which can cause pickle errors with Pillow.
-                params["request"] = copy_safe_request(request, include_files=False)
+                params['request'] = copy_safe_request(event['request'], include_files=False)
 
             # Enqueue the task
-            rq_queue.enqueue(
-                "extras.webhooks.send_webhook",
-                **params
-            )
+            rq_queue.enqueue('extras.webhooks.send_webhook', **params)
 
         # Scripts
         elif event_rule.action_type == EventRuleActionChoices.SCRIPT:
@@ -139,16 +153,16 @@ def process_event_rules(event_rules, object_type, event_type, data, username=Non
             params = {
                 "instance": event_rule.action_object,
                 "name": script.name,
-                "user": user,
+                "user": event['user'],
                 "data": event_data
             }
-            if snapshots:
-                params["snapshots"] = snapshots
-            if request:
-                params["request"] = copy_safe_request(request)
-            ScriptJob.enqueue(
-                **params
-            )
+            if 'snapshots' in event:
+                params['snapshots'] = event['snapshots']
+            if 'request' in event:
+                params['request'] = copy_safe_request(event['request'])
+
+            # Enqueue the job
+            ScriptJob.enqueue(**params)
 
         # Notification groups
         elif event_rule.action_type == EventRuleActionChoices.NOTIFICATION:
@@ -157,7 +171,7 @@ def process_event_rules(event_rules, object_type, event_type, data, username=Non
                 object_type=object_type,
                 object_id=event_data['id'],
                 object_repr=event_data.get('display'),
-                event_type=event_type
+                event_type=event['event_type']
             )
 
         else:
@@ -169,6 +183,8 @@ def process_event_rules(event_rules, object_type, event_type, data, username=Non
 def process_event_queue(events):
     """
     Flush a list of object representation to RQ for EventRule processing.
+
+    This is the default processor listed in EVENTS_PIPELINE.
     """
     events_cache = defaultdict(dict)
 
@@ -188,11 +204,7 @@ def process_event_queue(events):
         process_event_rules(
             event_rules=event_rules,
             object_type=object_type,
-            event_type=event['event_type'],
-            data=event['data'],
-            username=event['username'],
-            snapshots=event['snapshots'],
-            request=event['request'],
+            event=event,
         )
 
 

netbox/extras/signals.py

@@ -4,7 +4,7 @@ from django.dispatch import receiver
 
 from core.events import *
 from core.signals import job_end, job_start
-from extras.events import process_event_rules
+from extras.events import EventContext, process_event_rules
 from extras.models import EventRule, Notification, Subscription
 from netbox.config import get_config
 from netbox.models.features import has_feature
@@ -102,14 +102,12 @@ def process_job_start_event_rules(sender, **kwargs):
         enabled=True,
         object_types=sender.object_type
     )
-    username = sender.user.username if sender.user else None
-    process_event_rules(
-        event_rules=event_rules,
-        object_type=sender.object_type,
+    event = EventContext(
         event_type=JOB_STARTED,
         data=sender.data,
-        username=username
+        user=sender.user,
     )
+    process_event_rules(event_rules, sender.object_type, event)
 
 
 @receiver(job_end)
@@ -122,14 +120,12 @@ def process_job_end_event_rules(sender, **kwargs):
         enabled=True,
         object_types=sender.object_type
     )
-    username = sender.user.username if sender.user else None
-    process_event_rules(
-        event_rules=event_rules,
-        object_type=sender.object_type,
+    event = EventContext(
         event_type=JOB_COMPLETED,
         data=sender.data,
-        username=username
+        user=sender.user,
     )
+    process_event_rules(event_rules, sender.object_type, event)
 
 
 #

netbox/extras/tables/tables.py

@@ -43,7 +43,7 @@ IMAGEATTACHMENT_IMAGE = """
   <a href="{{ record.image.url }}" target="_blank" class="image-preview" data-bs-placement="top">
     <i class="mdi mdi-image"></i></a>
 {% endif %}
-<a href="{{ record.get_absolute_url }}">{{ record }}</a>
+<a href="{{ record.get_absolute_url }}">{{ record.filename|truncate_middle:16 }}</a>
 """
 
 NOTIFICATION_ICON = """

netbox/extras/tests/test_models.py

@@ -6,7 +6,7 @@ from django.core.files.uploadedfile import SimpleUploadedFile
 from django.forms import ValidationError
 from django.test import tag, TestCase
 
-from core.models import DataSource, ObjectType
+from core.models import AutoSyncRecord, DataSource, ObjectType
 from dcim.models import Device, DeviceRole, DeviceType, Location, Manufacturer, Platform, Region, Site, SiteGroup
 from extras.models import ConfigContext, ConfigContextProfile, ConfigTemplate, ImageAttachment, Tag, TaggedItem
 from tenancy.models import Tenant, TenantGroup
@@ -754,3 +754,53 @@ class ConfigTemplateTest(TestCase):
     @tag('regression')
     def test_config_template_with_data_source_nested_templates(self):
         self.assertEqual(self.BASE_TEMPLATE, self.main_config_template.render({}))
+
+    @tag('regression')
+    def test_autosyncrecord_cleanup_on_detach(self):
+        """Test that AutoSyncRecord is deleted when detaching from DataSource."""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            templates_dir = Path(temp_dir) / "templates"
+            templates_dir.mkdir(parents=True, exist_ok=True)
+
+            self._create_template_file(templates_dir, 'test.j2', 'Test content')
+
+            data_source = DataSource(
+                name="Test DataSource for Detach",
+                type="local",
+                source_url=str(templates_dir),
+            )
+            data_source.save()
+            data_source.sync()
+
+            data_file = data_source.datafiles.filter(path__endswith='test.j2').first()
+
+            # Create a ConfigTemplate with data_file and auto_sync_enabled
+            config_template = ConfigTemplate(
+                name="TestTemplateForDetach",
+                data_file=data_file,
+                auto_sync_enabled=True
+            )
+            config_template.clean()
+            config_template.save()
+
+            # Verify AutoSyncRecord was created
+            object_type = ObjectType.objects.get_for_model(ConfigTemplate)
+            autosync_records = AutoSyncRecord.objects.filter(
+                object_type=object_type,
+                object_id=config_template.pk
+            )
+            self.assertEqual(autosync_records.count(), 1, "AutoSyncRecord should be created")
+
+            # Detach from DataSource
+            config_template.data_file = None
+            config_template.data_source = None
+            config_template.auto_sync_enabled = False
+            config_template.clean()
+            config_template.save()
+
+            # Verify AutoSyncRecord was deleted
+            autosync_records = AutoSyncRecord.objects.filter(
+                object_type=object_type,
+                object_id=config_template.pk
+            )
+            self.assertEqual(autosync_records.count(), 0, "AutoSyncRecord should be deleted after detaching")

netbox/netbox/models/features.py

@@ -569,7 +569,6 @@ class SyncedDataMixin(models.Model):
             )
         else:
             AutoSyncRecord.objects.filter(
-                datafile=self.data_file,
                 object_type=object_type,
                 object_id=self.pk
             ).delete()
@@ -582,7 +581,6 @@ class SyncedDataMixin(models.Model):
         # Delete AutoSyncRecord
         object_type = ObjectType.objects.get_for_model(self)
         AutoSyncRecord.objects.filter(
-            datafile=self.data_file,
             object_type=object_type,
             object_id=self.pk
         ).delete()

netbox/project-static/src/forms/clearField.ts

@@ -0,0 +1,40 @@
+import TomSelect from 'tom-select';
+import { getElements } from '../util';
+
+/**
+ * Initialize clear-field dependencies.
+ * When a required field is cleared, dependent fields with data-requires-fields attribute will also be cleared.
+ */
+export function initClearField(): void {
+  // Find all fields with data-requires-fields attribute
+  for (const field of getElements<HTMLSelectElement>('[data-requires-fields]')) {
+    const requiredFieldsAttr = field.getAttribute('data-requires-fields');
+    if (!requiredFieldsAttr) continue;
+
+    // Parse the comma-separated list of required field names
+    const requiredFields = requiredFieldsAttr.split(',').map(name => name.trim());
+
+    // Set up listeners for each required field
+    for (const requiredFieldName of requiredFields) {
+      const requiredField = document.querySelector<HTMLSelectElement>(
+        `[name="${requiredFieldName}"]`,
+      );
+      if (!requiredField) continue;
+
+      // Listen for changes on the required field
+      requiredField.addEventListener('change', () => {
+        // If required field is cleared, also clear this dependent field
+        if (!requiredField.value || requiredField.value === '') {
+          // Check if this field uses TomSelect
+          const tomselect = (field as HTMLSelectElement & { tomselect?: TomSelect }).tomselect;
+          if (tomselect) {
+            tomselect.clear();
+          } else {
+            // Regular select field
+            field.value = '';
+          }
+        }
+      });
+    }
+  }
+}

netbox/project-static/src/forms/index.ts

@@ -1,9 +1,10 @@
+import { initClearField } from './clearField';
 import { initFormElements } from './elements';
 import { initFilterModifiers } from './filterModifiers';
 import { initSpeedSelector } from './speedSelector';
 
 export function initForms(): void {
-  for (const func of [initFormElements, initSpeedSelector, initFilterModifiers]) {
+  for (const func of [initFormElements, initSpeedSelector, initFilterModifiers, initClearField]) {
     func();
   }
 }

netbox/templates/ipam/aggregate/prefixes.html

@@ -3,6 +3,8 @@
 
 {% block extra_controls %}
   {% include 'ipam/inc/toggle_available.html' %}
+  {% include 'ipam/inc/max_depth.html' %}
+  {% include 'ipam/inc/max_length.html' %}  
   {% if perms.ipam.add_prefix and first_available_prefix %}
     <a href="{% url 'ipam:prefix_add' %}?prefix={{ first_available_prefix }}" class="btn btn-primary">
       <i class="mdi mdi-plus-thick" aria-hidden="true"></i> {% trans "Add Prefix" %}

netbox/templates/ipam/inc/max_depth.html

@@ -0,0 +1,20 @@
+{% load i18n %}
+{% load helpers %}
+
+<div class="dropdown">
+    <button class="btn btn-outline-secondary dropdown-toggle" type="button" id="max_depth" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
+        {% trans "Max Depth" %}{% if "depth__lte" in request.GET %}: {{ request.GET.depth__lte }}{% endif %}
+    </button>
+    <ul class="dropdown-menu" aria-labelledby="max_depth">
+        {% if request.GET.depth__lte %}
+            <li>
+                <a class="dropdown-item" href="{{ request.path }}{% querystring request depth__lte=None page=1 %}">{% trans "Clear" %}</a>
+            </li>
+        {% endif %}
+        {% for i in 16|as_range %}
+            <li><a class="dropdown-item" href="{{ request.path }}{% querystring request depth__lte=i page=1 %}">
+                {{ i }} {% if request.GET.depth__lte == i %}<i class="mdi mdi-check-bold"></i>{% endif %}
+            </a></li>
+        {% endfor %}
+    </ul>
+</div>

netbox/templates/ipam/inc/max_length.html

@@ -0,0 +1,20 @@
+{% load i18n %}
+{% load helpers %}
+
+<div class="dropdown">
+    <button class="btn btn-outline-secondary dropdown-toggle" type="button" id="max_length" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
+        {% trans "Max Length" %}{% if "mask_length__lte" in request.GET %}: {{ request.GET.mask_length__lte }}{% endif %}
+    </button>
+    <ul class="dropdown-menu" aria-labelledby="max_length">
+        {% if request.GET.mask_length__lte %}
+            <li>
+                <a class="dropdown-item" href="{{ request.path }}{% querystring request mask_length__lte=None page=1 %}">{% trans "Clear" %}</a>
+            </li>
+        {% endif %}
+        {% for i in "4,8,12,16,20,24,28,32,40,48,56,64"|split %}
+            <li><a class="dropdown-item" href="{{ request.path }}{% querystring request mask_length__lte=i page=1 %}">
+                {{ i }} {% if request.GET.mask_length__lte == i %}<i class="mdi mdi-check-bold"></i>{% endif %}
+            </a></li>
+        {% endfor %}
+    </ul>
+</div>

netbox/templates/ipam/prefix/prefixes.html

@@ -3,6 +3,8 @@
 
 {% block extra_controls %}
   {% include 'ipam/inc/toggle_available.html' %}
+  {% include 'ipam/inc/max_depth.html' %}
+  {% include 'ipam/inc/max_length.html' %}  
   {% if perms.ipam.add_prefix and first_available_prefix %}
     <a href="{% url 'ipam:prefix_add' %}?prefix={{ first_available_prefix }}&vrf={{ object.vrf.pk }}&site={{ object.site.pk }}&tenant_group={{ object.tenant.group.pk }}&tenant={{ object.tenant.pk }}" class="btn btn-primary">
       <i class="mdi mdi-plus-thick" aria-hidden="true"></i> {% trans "Add Prefix" %}

netbox/templates/ipam/prefix_list.html

@@ -6,38 +6,6 @@
     <button class="btn btn-outline-secondary toggle-depth" type="button">
         {% trans "Hide Depth Indicators" %}
     </button>
-    <div class="dropdown">
-        <button class="btn btn-outline-secondary dropdown-toggle" type="button" id="max_depth" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
-            {% trans "Max Depth" %}{% if "depth__lte" in request.GET %}: {{ request.GET.depth__lte }}{% endif %}
-        </button>
-        <ul class="dropdown-menu" aria-labelledby="max_depth">
-            {% if request.GET.depth__lte %}
-                <li>
-                    <a class="dropdown-item" href="{% url 'ipam:prefix_list' %}{% querystring request depth__lte=None page=1 %}">{% trans "Clear" %}</a>
-                </li>
-            {% endif %}
-            {% for i in 16|as_range %}
-                <li><a class="dropdown-item" href="{% url 'ipam:prefix_list' %}{% querystring request depth__lte=i page=1 %}">
-                    {{ i }} {% if request.GET.depth__lte == i %}<i class="mdi mdi-check-bold"></i>{% endif %}
-                </a></li>
-            {% endfor %}
-        </ul>
-    </div>
-    <div class="dropdown">
-        <button class="btn btn-outline-secondary dropdown-toggle" type="button" id="max_length" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
-            {% trans "Max Length" %}{% if "mask_length__lte" in request.GET %}: {{ request.GET.mask_length__lte }}{% endif %}
-        </button>
-        <ul class="dropdown-menu" aria-labelledby="max_length">
-            {% if request.GET.mask_length__lte %}
-                <li>
-                    <a class="dropdown-item" href="{% url 'ipam:prefix_list' %}{% querystring request mask_length__lte=None page=1 %}">{% trans "Clear" %}</a>
-                </li>
-            {% endif %}
-            {% for i in "4,8,12,16,20,24,28,32,40,48,56,64"|split %}
-                <li><a class="dropdown-item" href="{% url 'ipam:prefix_list' %}{% querystring request mask_length__lte=i page=1 %}">
-                    {{ i }} {% if request.GET.mask_length__lte == i %}<i class="mdi mdi-check-bold"></i>{% endif %}
-                </a></li>
-            {% endfor %}
-        </ul>
-    </div>
+    {% include 'ipam/inc/max_depth.html' %}
+    {% include 'ipam/inc/max_length.html' %}
 {% endblock %}

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: 2026-01-21 05:07+0000\n"
+"POT-Creation-Date: 2026-01-22 05:07+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"
@@ -12037,7 +12037,7 @@ msgstr ""
 msgid "date synced"
 msgstr ""
 
-#: netbox/netbox/models/features.py:623
+#: netbox/netbox/models/features.py:621
 #, python-brace-format
 msgid "{class_name} must implement a sync_data() method."
 msgstr ""
@@ -13935,8 +13935,8 @@ msgid "No VLANs Assigned"
 msgstr ""
 
 #: netbox/templates/dcim/inc/interface_vlans_table.html:44
-#: netbox/templates/ipam/prefix_list.html:16
-#: netbox/templates/ipam/prefix_list.html:33
+#: netbox/templates/ipam/inc/max_depth.html:11
+#: netbox/templates/ipam/inc/max_length.html:11
 msgid "Clear"
 msgstr ""
 
@@ -15053,8 +15053,8 @@ msgstr ""
 msgid "Date Added"
 msgstr ""
 
-#: netbox/templates/ipam/aggregate/prefixes.html:8
-#: netbox/templates/ipam/prefix/prefixes.html:8
+#: netbox/templates/ipam/aggregate/prefixes.html:10
+#: netbox/templates/ipam/prefix/prefixes.html:10
 #: netbox/templates/ipam/role.html:10
 msgid "Add Prefix"
 msgstr ""
@@ -15083,6 +15083,14 @@ msgstr ""
 msgid "Bulk Create"
 msgstr ""
 
+#: netbox/templates/ipam/inc/max_depth.html:6
+msgid "Max Depth"
+msgstr ""
+
+#: netbox/templates/ipam/inc/max_length.html:6
+msgid "Max Length"
+msgstr ""
+
 #: netbox/templates/ipam/inc/panels/fhrp_groups.html:10
 msgid "Create Group"
 msgstr ""
@@ -15184,14 +15192,6 @@ msgstr ""
 msgid "Hide Depth Indicators"
 msgstr ""
 
-#: netbox/templates/ipam/prefix_list.html:11
-msgid "Max Depth"
-msgstr ""
-
-#: netbox/templates/ipam/prefix_list.html:28
-msgid "Max Length"
-msgstr ""
-
 #: netbox/templates/ipam/rir.html:10
 msgid "Add Aggregate"
 msgstr ""

netbox/utilities/forms/widgets/select.py

@@ -5,6 +5,7 @@ from ..utils import add_blank_choice
 
 __all__ = (
     'BulkEditNullBooleanSelect',
+    'ClearableSelect',
     'ColorSelect',
     'HTMXSelect',
     'SelectWithPK',
@@ -28,6 +29,21 @@ class BulkEditNullBooleanSelect(forms.NullBooleanSelect):
         )
 
 
+class ClearableSelect(forms.Select):
+    """
+    A Select widget that will be automatically cleared when one or more required fields are cleared.
+
+    Args:
+        requires_fields: A list of field names that this field depends on. When any of these fields
+                        are cleared, this field will also be cleared automatically via JavaScript.
+    """
+
+    def __init__(self, *args, requires_fields=None, **kwargs):
+        super().__init__(*args, **kwargs)
+        if requires_fields:
+            self.attrs['data-requires-fields'] = ','.join(requires_fields)
+
+
 class ColorSelect(forms.Select):
     """
     Extends the built-in Select widget to colorize each <option>.

netbox/utilities/templatetags/builtins/filters.py

@@ -252,3 +252,16 @@ def isodatetime(value, spec='seconds'):
     else:
         return ''
     return mark_safe(f'<span title="{naturaltime(value)}">{text}</span>')
+
+
+@register.filter
+def truncate_middle(value, length):
+    if len(value) <= length:
+        return value
+
+    # Calculate split points for the two parts
+    half_len = (length - 1) // 2  # 1 for the ellipsis
+    first_part = value[:half_len]
+    second_part = value[len(value) - (length - 1 - half_len):]
+
+    return mark_safe(f"{first_part}&hellip;{second_part}")