Allow bridge when importing interface templates

Adding the field to the InterfaceTemplateImportForm is enough. The two
clean_*_type methods are for properly dynamically restricting what
values can be selected.

netbox/dcim/forms/object_import.py

@@ -84,6 +84,12 @@ class InterfaceTemplateImportForm(forms.ModelForm):
         label=_('Type'),
         choices=InterfaceTypeChoices.CHOICES
     )
+    bridge = forms.ModelChoiceField(
+        label=_('Bridge'),
+        queryset=InterfaceTemplate.objects.all(),
+        to_field_name='name',
+        required=False
+    )
     poe_mode = forms.ChoiceField(
         choices=InterfacePoEModeChoices,
         required=False,
@@ -103,10 +109,24 @@ class InterfaceTemplateImportForm(forms.ModelForm):
     class Meta:
         model = InterfaceTemplate
         fields = [
-            'device_type', 'module_type', 'name', 'label', 'type', 'enabled', 'mgmt_only', 'description', 'poe_mode',
-            'poe_type', 'rf_role'
+            'device_type', 'module_type', 'name', 'label', 'type', 'enabled', 'mgmt_only', 'description', 'bridge',
+            'poe_mode', 'poe_type', 'rf_role'
         ]
 
+    def clean_device_type(self):
+        if device_type := self.cleaned_data['device_type']:
+            bridge = self.fields['bridge']
+            bridge.queryset = bridge.queryset.filter(device_type=device_type)
+
+        return device_type
+
+    def clean_module_type(self):
+        if module_type := self.cleaned_data['module_type']:
+            bridge = self.fields['bridge']
+            bridge.queryset = bridge.queryset.filter(module_type=module_type)
+
+        return module_type
+
 
 class FrontPortTemplateImportForm(forms.ModelForm):
     type = forms.ChoiceField(

netbox/dcim/tests/test_views.py

@@ -1055,6 +1055,55 @@ console-ports:
                 self.assertHttpStatus(response, 200)
                 self.assertContains(response, "console-ports[0]: Must be a dictionary.")
 
+    @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
+    def test_import_interfacebridge(self):
+        IMPORT_DATA = """
+manufacturer: Manufacturer 1
+model: TEST-4000
+slug: test-4000
+u_height: 1
+interfaces:
+  - name: Bridge
+    type: 1000base-t
+  - name: Bridge Interface 1
+    type: 1000base-t
+    bridge: Bridge
+"""
+
+        # Add all required permissions to the test user
+        self.add_permissions(
+            'dcim.view_devicetype',
+            'dcim.add_devicetype',
+            'dcim.add_consoleporttemplate',
+            'dcim.add_consoleserverporttemplate',
+            'dcim.add_powerporttemplate',
+            'dcim.add_poweroutlettemplate',
+            'dcim.add_interfacetemplate',
+            'dcim.add_frontporttemplate',
+            'dcim.add_rearporttemplate',
+            'dcim.add_modulebaytemplate',
+            'dcim.add_devicebaytemplate',
+            'dcim.add_inventoryitemtemplate',
+        )
+
+        form_data = {
+            'data': IMPORT_DATA,
+            'format': 'yaml'
+        }
+
+        response = self.client.post(reverse('dcim:devicetype_bulk_import'), data=form_data, follow=True)
+        self.assertHttpStatus(response, 200)
+        self.assertContains(response, "Imported 1 device types")
+
+        device_type = DeviceType.objects.get(model='TEST-4000')
+        self.assertEqual(device_type.interfacetemplates.count(), 2)
+
+        interfaces = InterfaceTemplate.objects.all().order_by('id')
+        self.assertEqual(interfaces[0].name, 'Bridge')
+        self.assertIsNone(interfaces[0].bridge)
+        self.assertEqual(interfaces[1].name, 'Bridge Interface 1')
+        self.assertEqual(interfaces[1].bridge.name, "Bridge")
+
     def test_export_objects(self):
         url = reverse('dcim:devicetype_list')
         self.add_permissions('dcim.view_devicetype')