Implement support for nested TenantGroups

netbox/tenancy/migrations/0007_nested_tenantgroups.py

@@ -0,0 +1,43 @@
+from django.db import migrations, models
+import django.db.models.deletion
+import mptt.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tenancy', '0006_custom_tag_models'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='tenantgroup',
+            name='parent',
+            field=mptt.fields.TreeForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='children', to='tenancy.TenantGroup'),
+        ),
+        migrations.AddField(
+            model_name='tenantgroup',
+            name='level',
+            field=models.PositiveIntegerField(default=0, editable=False),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='tenantgroup',
+            name='lft',
+            field=models.PositiveIntegerField(default=1, editable=False),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='tenantgroup',
+            name='rght',
+            field=models.PositiveIntegerField(default=2, editable=False),
+            preserve_default=False,
+        ),
+        # tree_id will be set to a valid value during the following migration (which needs to be a separate migration)
+        migrations.AddField(
+            model_name='tenantgroup',
+            name='tree_id',
+            field=models.PositiveIntegerField(db_index=True, default=0, editable=False),
+            preserve_default=False,
+        ),
+    ]

netbox/tenancy/migrations/0008_nested_tenantgroups_rebuild.py

@@ -0,0 +1,21 @@
+from django.db import migrations
+
+
+def rebuild_mptt(apps, schema_editor):
+    TenantGroup = apps.get_model('tenancy', 'TenantGroup')
+    for i, tenantgroup in enumerate(TenantGroup.objects.all(), start=1):
+        TenantGroup.objects.filter(pk=tenantgroup.pk).update(tree_id=i)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tenancy', '0007_nested_tenantgroups'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=rebuild_mptt,
+            reverse_code=migrations.RunPython.noop
+        ),
+    ]