Initial work on #4721 (WIP)

netbox/ipam/migrations/0037_ipaddress_assignment.py

@@ -0,0 +1,35 @@
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+def set_assigned_object_type(apps, schema_editor):
+    ContentType = apps.get_model('contenttypes', 'ContentType')
+    IPAddress = apps.get_model('ipam', 'IPAddress')
+
+    device_ct = ContentType.objects.get(app_label='dcim', model='interface').pk
+    IPAddress.objects.update(assigned_object_type=device_ct)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('ipam', '0036_standardize_description'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='ipaddress',
+            old_name='interface',
+            new_name='assigned_object_id',
+        ),
+        migrations.AddField(
+            model_name='ipaddress',
+            name='assigned_object_type',
+            field=models.ForeignKey(limit_choices_to=models.Q(models.Q(models.Q(('app_label', 'dcim'), ('model', 'interface')), models.Q(('app_label', 'virtualization'), ('model', 'interface')), _connector='OR')), on_delete=django.db.models.deletion.PROTECT, related_name='+', to='contenttypes.ContentType', blank=True, null=True),
+            preserve_default=False,
+        ),
+        migrations.RunPython(
+            code=set_assigned_object_type
+        ),
+    ]