.

djangorota/rota/migrations/0005_add_request_token.py

@@ -0,0 +1,18 @@
+# Generated by assistant for adding nullable request_token
+from django.db import migrations, models
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("rota", "0004_worker_options"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="worker",
+            name="request_token",
+            field=models.UUIDField(default=uuid.uuid4, editable=False, null=True),
+        ),
+    ]

djangorota/rota/migrations/0006_populate_request_token.py

@@ -0,0 +1,26 @@
+from django.db import migrations
+import uuid
+
+
+def generate_tokens(apps, schema_editor):
+    Worker = apps.get_model('rota', 'Worker')
+    db_alias = schema_editor.connection.alias
+    for w in Worker.objects.using(db_alias).all():
+        if not getattr(w, 'request_token', None):
+            new_token = uuid.uuid4()
+            # extremely unlikely collision, but guard anyway
+            while Worker.objects.using(db_alias).filter(request_token=new_token).exists():
+                new_token = uuid.uuid4()
+            w.request_token = new_token
+            w.save(update_fields=['request_token'])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rota', '0005_add_request_token'),
+    ]
+
+    operations = [
+        migrations.RunPython(generate_tokens, reverse_code=migrations.RunPython.noop),
+    ]

djangorota/rota/migrations/0007_make_request_token_unique.py

@@ -0,0 +1,16 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rota', '0006_populate_request_token'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='worker',
+            name='request_token',
+            field=models.UUIDField(editable=False, unique=True),
+        ),
+    ]