Closes #19523: Add counter‑cached counts & filters for DeviceType, ModuleType, and RackType

netbox/dcim/api/serializers_/devicetypes.py

@@ -5,7 +5,7 @@
 
 from dcim.choices import *
 from dcim.models import DeviceType, ModuleType, ModuleTypeProfile
-from netbox.api.fields import AttributesField, ChoiceField, RelatedObjectCountField
+from netbox.api.fields import AttributesField, ChoiceField
 from netbox.api.serializers import PrimaryModelSerializer
 from netbox.choices import *
 from .manufacturers import ManufacturerSerializer
@@ -45,9 +45,7 @@ class DeviceTypeSerializer(PrimaryModelSerializer):
     device_bay_template_count = serializers.IntegerField(read_only=True)
     module_bay_template_count = serializers.IntegerField(read_only=True)
     inventory_item_template_count = serializers.IntegerField(read_only=True)
-
-    # Related object counts
-    device_count = RelatedObjectCountField('instances')
+    device_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = DeviceType
@@ -100,12 +98,13 @@ class ModuleTypeSerializer(PrimaryModelSerializer):
         required=False,
         allow_null=True
     )
+    module_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = ModuleType
         fields = [
             'id', 'url', 'display_url', 'display', 'profile', 'manufacturer', 'model', 'part_number', 'airflow',
             'weight', 'weight_unit', 'description', 'attributes', 'owner', 'comments', 'tags', 'custom_fields',
-            'created', 'last_updated',
+            'created', 'last_updated', 'module_count',
         ]
-        brief_fields = ('id', 'url', 'display', 'profile', 'manufacturer', 'model', 'description')
+        brief_fields = ('id', 'url', 'display', 'profile', 'manufacturer', 'model', 'description', 'module_count')

netbox/dcim/api/serializers_/racks.py

@@ -62,19 +62,18 @@ class RackBaseSerializer(PrimaryModelSerializer):
 
 
 class RackTypeSerializer(RackBaseSerializer):
-    manufacturer = ManufacturerSerializer(
-        nested=True
-    )
+    manufacturer = ManufacturerSerializer(nested=True)
+    rack_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = RackType
         fields = [
             'id', 'url', 'display_url', 'display', 'manufacturer', 'model', 'slug', 'description', 'form_factor',
             'width', 'u_height', 'starting_unit', 'desc_units', 'outer_width', 'outer_height', 'outer_depth',
             'outer_unit', 'weight', 'max_weight', 'weight_unit', 'mounting_depth', 'description', 'owner', 'comments',
-            'tags', 'custom_fields', 'created', 'last_updated',
+            'tags', 'custom_fields', 'created', 'last_updated', 'rack_count',
         ]
-        brief_fields = ('id', 'url', 'display', 'manufacturer', 'model', 'slug', 'description')
+        brief_fields = ('id', 'url', 'display', 'manufacturer', 'model', 'slug', 'description', 'rack_count')
 
 
 class RackSerializer(RackBaseSerializer):

netbox/dcim/apps.py

@@ -11,7 +11,7 @@ def ready(self):
         from netbox.models.features import register_models
         from utilities.counters import connect_counters
         from . import signals, search  # noqa: F401
-        from .models import CableTermination, Device, DeviceType, VirtualChassis
+        from .models import CableTermination, Device, DeviceType, ModuleType, RackType, VirtualChassis
 
         # Register models
         register_models(*self.get_models())
@@ -31,4 +31,4 @@ def ready(self):
         })
 
         # Register counters
-        connect_counters(Device, DeviceType, VirtualChassis)
+        connect_counters(Device, DeviceType, ModuleType, RackType, VirtualChassis)

netbox/dcim/filtersets.py

@@ -317,6 +317,9 @@ class Meta:
         fields = (
             'id', 'model', 'slug', 'u_height', 'starting_unit', 'desc_units', 'outer_width', 'outer_height',
             'outer_depth', 'outer_unit', 'mounting_depth', 'weight', 'max_weight', 'weight_unit', 'description',
+
+            # Counters
+            'rack_count',
         )
 
     def search(self, queryset, name, value):
@@ -627,6 +630,7 @@ class Meta:
             'device_bay_template_count',
             'module_bay_template_count',
             'inventory_item_template_count',
+            'device_count',
         )
 
     def search(self, queryset, name, value):
@@ -747,7 +751,12 @@ class ModuleTypeFilterSet(AttributeFiltersMixin, PrimaryModelFilterSet):
 
     class Meta:
         model = ModuleType
-        fields = ('id', 'model', 'part_number', 'airflow', 'weight', 'weight_unit', 'description')
+        fields = (
+            'id', 'model', 'part_number', 'airflow', 'weight', 'weight_unit', 'description',
+
+            # Counters
+            'module_count',
+        )
 
     def search(self, queryset, name, value):
         if not value.strip():

netbox/dcim/forms/filtersets.py

@@ -317,7 +317,7 @@ class RackTypeFilterForm(RackBaseFilterForm):
     model = RackType
     fieldsets = (
         FieldSet('q', 'filter_id', 'tag', 'owner_id'),
-        FieldSet('manufacturer_id', 'form_factor', 'width', 'u_height', name=_('Rack Type')),
+        FieldSet('manufacturer_id', 'form_factor', 'width', 'u_height', 'rack_count', name=_('Rack Type')),
         FieldSet('starting_unit', 'desc_units', name=_('Numbering')),
         FieldSet('weight', 'max_weight', 'weight_unit', name=_('Weight')),
     )
@@ -327,6 +327,11 @@ class RackTypeFilterForm(RackBaseFilterForm):
         required=False,
         label=_('Manufacturer')
     )
+    rack_count = forms.IntegerField(
+        label=_('Rack count'),
+        required=False,
+        min_value=0,
+    )
     tag = TagFilterField(model)
 
 
@@ -498,7 +503,8 @@ class DeviceTypeFilterForm(PrimaryModelFilterSetForm):
     fieldsets = (
         FieldSet('q', 'filter_id', 'tag', 'owner_id'),
         FieldSet(
-            'manufacturer_id', 'default_platform_id', 'part_number', 'subdevice_role', 'airflow', name=_('Hardware')
+            'manufacturer_id', 'default_platform_id', 'part_number', 'device_count',
+            'subdevice_role', 'airflow', name=_('Hardware')
         ),
         FieldSet('has_front_image', 'has_rear_image', name=_('Images')),
         FieldSet(
@@ -522,6 +528,11 @@ class DeviceTypeFilterForm(PrimaryModelFilterSetForm):
         label=_('Part number'),
         required=False
     )
+    device_count = forms.IntegerField(
+        label=_('Device count'),
+        required=False,
+        min_value=0,
+    )
     subdevice_role = forms.MultipleChoiceField(
         label=_('Subdevice role'),
         choices=add_blank_choice(SubdeviceRoleChoices),
@@ -633,7 +644,10 @@ class ModuleTypeFilterForm(PrimaryModelFilterSetForm):
     model = ModuleType
     fieldsets = (
         FieldSet('q', 'filter_id', 'tag', 'owner_id'),
-        FieldSet('profile_id', 'manufacturer_id', 'part_number', 'airflow', name=_('Hardware')),
+        FieldSet(
+            'profile_id', 'manufacturer_id', 'part_number', 'module_count',
+            'airflow', name=_('Hardware')
+        ),
         FieldSet(
             'console_ports', 'console_server_ports', 'power_ports', 'power_outlets', 'interfaces',
             'pass_through_ports', name=_('Components')
@@ -655,6 +669,11 @@ class ModuleTypeFilterForm(PrimaryModelFilterSetForm):
         label=_('Part number'),
         required=False
     )
+    module_count = forms.IntegerField(
+        label=_('Module count'),
+        required=False,
+        min_value=0,
+    )
     console_ports = forms.NullBooleanField(
         required=False,
         label=_('Has console ports'),

netbox/dcim/graphql/filters.py

@@ -4,7 +4,7 @@
 import strawberry
 import strawberry_django
 from strawberry.scalars import ID
-from strawberry_django import FilterLookup
+from strawberry_django import ComparisonFilterLookup, FilterLookup
 
 from core.graphql.filter_mixins import ChangeLogFilterMixin
 from dcim import models
@@ -328,6 +328,9 @@ class DeviceTypeFilter(ImageAttachmentFilterMixin, PrimaryModelFilterMixin, Weig
     )
     default_platform_id: ID | None = strawberry_django.filter_field()
     part_number: FilterLookup[str] | None = strawberry_django.filter_field()
+    instances: Annotated['DeviceFilter', strawberry.lazy('dcim.graphql.filters')] | None = (
+        strawberry_django.filter_field()
+    )
     u_height: Annotated['FloatLookup', strawberry.lazy('netbox.graphql.filter_lookups')] | None = (
         strawberry_django.filter_field()
     )
@@ -385,6 +388,7 @@ class DeviceTypeFilter(ImageAttachmentFilterMixin, PrimaryModelFilterMixin, Weig
     device_bay_template_count: FilterLookup[int] | None = strawberry_django.filter_field()
     module_bay_template_count: FilterLookup[int] | None = strawberry_django.filter_field()
     inventory_item_template_count: FilterLookup[int] | None = strawberry_django.filter_field()
+    device_count: ComparisonFilterLookup[int] | None = strawberry_django.filter_field()
 
 
 @strawberry_django.filter_type(models.FrontPort, lookups=True)
@@ -685,6 +689,9 @@ class ModuleTypeFilter(ImageAttachmentFilterMixin, PrimaryModelFilterMixin, Weig
     profile_id: ID | None = strawberry_django.filter_field()
     model: FilterLookup[str] | None = strawberry_django.filter_field()
     part_number: FilterLookup[str] | None = strawberry_django.filter_field()
+    instances: Annotated['ModuleFilter', strawberry.lazy('dcim.graphql.filters')] | None = (
+        strawberry_django.filter_field()
+    )
     airflow: Annotated['ModuleAirflowEnum', strawberry.lazy('dcim.graphql.enums')] | None = (
         strawberry_django.filter_field()
     )
@@ -718,6 +725,7 @@ class ModuleTypeFilter(ImageAttachmentFilterMixin, PrimaryModelFilterMixin, Weig
     inventory_item_templates: (
         Annotated['InventoryItemTemplateFilter', strawberry.lazy('dcim.graphql.filters')] | None
     ) = strawberry_django.filter_field()
+    module_count: ComparisonFilterLookup[int] | None = strawberry_django.filter_field()
 
 
 @strawberry_django.filter_type(models.Platform, lookups=True)
@@ -846,6 +854,8 @@ class RackTypeFilter(RackBaseFilterMixin):
     manufacturer_id: ID | None = strawberry_django.filter_field()
     model: FilterLookup[str] | None = strawberry_django.filter_field()
     slug: FilterLookup[str] | None = strawberry_django.filter_field()
+    racks: Annotated['RackFilter', strawberry.lazy('dcim.graphql.filters')] | None = strawberry_django.filter_field()
+    rack_count: ComparisonFilterLookup[int] | None = strawberry_django.filter_field()
 
 
 @strawberry_django.filter_type(models.Rack, lookups=True)

netbox/dcim/graphql/types.py

@@ -358,6 +358,7 @@ class DeviceTypeType(PrimaryObjectType):
     device_bay_template_count: BigInt
     module_bay_template_count: BigInt
     inventory_item_template_count: BigInt
+    device_count: BigInt
     front_image: strawberry_django.fields.types.DjangoImageType | None
     rear_image: strawberry_django.fields.types.DjangoImageType | None
     manufacturer: Annotated["ManufacturerType", strawberry.lazy('dcim.graphql.types')]
@@ -605,6 +606,7 @@ class ModuleTypeProfileType(PrimaryObjectType):
     pagination=True
 )
 class ModuleTypeType(PrimaryObjectType):
+    module_count: BigInt
     profile: Annotated["ModuleTypeProfileType", strawberry.lazy('dcim.graphql.types')] | None
     manufacturer: Annotated["ManufacturerType", strawberry.lazy('dcim.graphql.types')]
 
@@ -709,6 +711,7 @@ class PowerPortTemplateType(ModularComponentTemplateType):
     pagination=True
 )
 class RackTypeType(PrimaryObjectType):
+    rack_count: BigInt
     manufacturer: Annotated["ManufacturerType", strawberry.lazy('dcim.graphql.types')]
 
 

netbox/dcim/migrations/0218_devicetype_device_count.py

@@ -0,0 +1,66 @@
+import utilities.fields
+from django.db import migrations
+from django.db.models import Count, OuterRef, Subquery
+
+
+def _populate_count_for_type(
+    apps, schema_editor, app_name: str, model_name: str, target_field: str, related_name: str = 'instances'
+):
+    """
+    Update a CounterCache field on the specified model by annotating the count of related instances.
+    """
+    Model = apps.get_model(app_name, model_name)
+    db_alias = schema_editor.connection.alias
+
+    count_subquery = (
+        Model.objects.using(db_alias)
+        .filter(pk=OuterRef('pk'))
+        .annotate(_instance_count=Count(related_name))
+        .values('_instance_count')
+    )
+    Model.objects.using(db_alias).update(**{target_field: Subquery(count_subquery)})
+
+
+def populate_device_type_device_count(apps, schema_editor):
+    _populate_count_for_type(apps, schema_editor, 'dcim', 'DeviceType', 'device_count')
+
+
+def populate_module_type_module_count(apps, schema_editor):
+    _populate_count_for_type(apps, schema_editor, 'dcim', 'ModuleType', 'module_count')
+
+
+def populate_rack_type_rack_count(apps, schema_editor):
+    _populate_count_for_type(apps, schema_editor, 'dcim', 'RackType', 'rack_count', related_name='racks')
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('dcim', '0217_owner'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='devicetype',
+            name='device_count',
+            field=utilities.fields.CounterCacheField(
+                default=0, editable=False, to_field='device_type', to_model='dcim.Device'
+            ),
+        ),
+        migrations.RunPython(populate_device_type_device_count, migrations.RunPython.noop),
+        migrations.AddField(
+            model_name='moduletype',
+            name='module_count',
+            field=utilities.fields.CounterCacheField(
+                default=0, editable=False, to_field='module_type', to_model='dcim.Module'
+            ),
+        ),
+        migrations.RunPython(populate_module_type_module_count, migrations.RunPython.noop),
+        migrations.AddField(
+            model_name='racktype',
+            name='rack_count',
+            field=utilities.fields.CounterCacheField(
+                default=0, editable=False, to_field='rack_type', to_model='dcim.Rack'
+            ),
+        ),
+        migrations.RunPython(populate_rack_type_rack_count, migrations.RunPython.noop),
+    ]

netbox/dcim/models/devices.py

@@ -185,6 +185,10 @@ class DeviceType(ImageAttachmentsMixin, PrimaryModel, WeightMixin):
         to_model='dcim.InventoryItemTemplate',
         to_field='device_type'
     )
+    device_count = CounterCacheField(
+        to_model='dcim.Device',
+        to_field='device_type'
+    )
 
     clone_fields = (
         'manufacturer', 'default_platform', 'u_height', 'is_full_depth', 'subdevice_role', 'airflow', 'weight',

netbox/dcim/models/modules.py

@@ -13,8 +13,10 @@
 from netbox.models import PrimaryModel
 from netbox.models.features import ImageAttachmentsMixin
 from netbox.models.mixins import WeightMixin
+from utilities.fields import CounterCacheField
 from utilities.jsonschema import validate_schema
 from utilities.string import title
+from utilities.tracking import TrackingModelMixin
 from .device_components import *
 
 __all__ = (
@@ -92,6 +94,10 @@ class ModuleType(ImageAttachmentsMixin, PrimaryModel, WeightMixin):
         null=True,
         verbose_name=_('attributes')
     )
+    module_count = CounterCacheField(
+        to_model='dcim.Module',
+        to_field='module_type'
+    )
 
     clone_fields = ('profile', 'manufacturer', 'weight', 'weight_unit', 'airflow')
     prerequisite_models = (
@@ -186,7 +192,7 @@ def to_yaml(self):
         return yaml.dump(dict(data), sort_keys=False)
 
 
-class Module(PrimaryModel, ConfigContextModel):
+class Module(TrackingModelMixin, PrimaryModel, ConfigContextModel):
     """
     A Module represents a field-installable component within a Device which may itself hold multiple device components
     (for example, a line card within a chassis switch). Modules are instantiated from ModuleTypes.