Converted OrganizationConfigSettings to UUID primary key

openwisp_controller/config/migrations/0002_config_settings_uuid.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-03-14 17:49
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('config', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='organizationconfigsettings',
+            name='id',
+            field=models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False),
+        ),
+    ]

openwisp_controller/config/models.py

@@ -1,3 +1,5 @@
+import uuid
+
 from django.core.exceptions import ValidationError
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
@@ -148,6 +150,7 @@ class OrganizationConfigSettings(models.Model):
     Configuration management settings
     specific to each organization
     """
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     organization = models.OneToOneField('openwisp_users.Organization',
                                         verbose_name=_('organization'),
                                         related_name='config_settings')