Fixes: #14058 - Limits platform selection to manufacturer and platforms with no manufacturer

netbox/dcim/filtersets.py

@@ -2,6 +2,8 @@
 from django.contrib.auth import get_user_model
 from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import gettext as _
+from drf_spectacular.types import OpenApiTypes
+from drf_spectacular.utils import extend_schema_field
 
 from circuits.models import CircuitTermination
 from extras.filtersets import LocalConfigContextFilterSet
@@ -818,6 +820,10 @@ class PlatformFilterSet(OrganizationalModelFilterSet):
         to_field_name='slug',
         label=_('Manufacturer (slug)'),
     )
+    available_for_device_type = django_filters.ModelChoiceFilter(
+        queryset=DeviceType.objects.all(),
+        method='get_for_device_type'
+    )
     config_template_id = django_filters.ModelMultipleChoiceFilter(
         queryset=ConfigTemplate.objects.all(),
         label=_('Config template (ID)'),
@@ -827,6 +833,14 @@ class Meta:
         model = Platform
         fields = ['id', 'name', 'slug', 'description']
 
+    @extend_schema_field(OpenApiTypes.STR)
+    def get_for_device_type(self, queryset, name, value):
+        """
+        Return all Platforms available for a specific manufacturer based on device type and Platforms not assigned any
+        manufacturer
+        """
+        return queryset.filter(Q(manufacturer=None) | Q(manufacturer__device_types=value))
+
 
 class DeviceFilterSet(
     NetBoxModelFilterSet,

netbox/dcim/forms/model_forms.py

@@ -291,7 +291,11 @@ class DeviceTypeForm(NetBoxModelForm):
     default_platform = DynamicModelChoiceField(
         label=_('Default platform'),
         queryset=Platform.objects.all(),
-        required=False
+        required=False,
+        selector=True,
+        query_params={
+            'manufacturer_id': ['$manufacturer', 'null'],
+        }
     )
     slug = SlugField(
         label=_('Slug'),
@@ -444,7 +448,10 @@ class DeviceForm(TenancyForm, NetBoxModelForm):
         label=_('Platform'),
         queryset=Platform.objects.all(),
         required=False,
-        selector=True
+        selector=True,
+        query_params={
+            'available_for_device_type': '$device_type',
+        }
     )
     cluster = DynamicModelChoiceField(
         label=_('Cluster'),

netbox/dcim/tests/test_filtersets.py

@@ -1787,6 +1787,7 @@ def setUpTestData(cls):
             Platform(name='Platform 1', slug='platform-1', manufacturer=manufacturers[0], description='foobar1'),
             Platform(name='Platform 2', slug='platform-2', manufacturer=manufacturers[1], description='foobar2'),
             Platform(name='Platform 3', slug='platform-3', manufacturer=manufacturers[2], description='foobar3'),
+            Platform(name='Platform 4', slug='platform-4'),
         )
         Platform.objects.bulk_create(platforms)
 
@@ -1813,6 +1814,17 @@ def test_manufacturer(self):
         params = {'manufacturer': [manufacturers[0].slug, manufacturers[1].slug]}
         self.assertEqual(self.filterset(params, self.queryset).qs.count(), 2)
 
+    def test_available_for_device_type(self):
+        manufacturers = Manufacturer.objects.all()[:2]
+        device_type = DeviceType.objects.create(
+            manufacturer=manufacturers[0],
+            model='Device Type 1',
+            slug='device-type-1',
+            u_height=1
+        )
+        params = {'available_for_device_type': device_type.pk}
+        self.assertEqual(self.filterset(params, self.queryset).qs.count(), 2)
+
 
 class DeviceTestCase(TestCase, ChangeLoggedFilterSetTests):
     queryset = Device.objects.all()