make Cut.uuid unique (fixes #21002)

petale/migrations/0007_auto_20180110_1126.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.core.validators
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('petale', '0006_auto_20171017_1625'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cut',
+            name='uuid',
+            field=models.CharField(unique=True, max_length=255, validators=[django.core.validators.RegexValidator(b'^[A-Za-z0-9-_]+$')]),
+        ),
+    ]

petale/models.py

@@ -91,7 +91,8 @@ class Partner(models.Model):
 class CUT(models.Model):
     uuid = models.CharField(
         max_length=255,
-        validators=[id_validator])
+        validators=[id_validator],
+        unique=True)
 
     def __unicode__(self):
         return self.uuid