On 9/12/19 3:00 am, Stephen Finucane wrote:
--- /dev/null
+++ b/patchwork/migrations/0038_state_slug.py
@@ -0,0 +1,68 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import unicode_literals
+
+from django.db import migrations, models, transaction
+from django.utils.text import slugify
+
+
+def validate_uniqueness(apps, schema_editor):
+ """Ensure all State.name entries are unique.
+
+ We need to do this before enforcing a uniqueness constraint.
+ """
+
+ State = apps.get_model('patchwork', 'State')
+
+ unique_count = len(State.objects.order_by().values_list(
+ 'name', flat=True).distinct())
+ total_count = State.objects.count()
+
+ if unique_count != total_count:
+ raise Exception(
+ 'You have non-unique States entries that need to be combined '
+ 'before you can run this migration. This migration must be done '
+ 'by hand. If you need assistance, please contact '
+ '[email protected]')
I think the migration can still fail without printing a helpful
exception message if two states have names that are different but still
slugify to the same thing?
--
Andrew Donnellan OzLabs, ADL Canberra
[email protected] IBM Australia Limited
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