Added a migration to set an explicit content-type for Message objects when missing.

 - Legacy-Id: 17350

Author: levkowetz

ietf/message/migrations/0010_fix_content_type.py

@@ -0,0 +1,34 @@
+# Copyright The IETF Trust 2020, All Rights Reserved
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.20 on 2019-05-21 14:27
+
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+from tqdm import tqdm
+
+from django.db import migrations
+
+import debug                            # pyflakes:ignore
+
+
+def forward(apps, schema_editor):
+
+    Message                     = apps.get_model('message', 'Message')
+
+    for m in tqdm(Message.objects.filter(content_type='')):
+        m.content_type = 'text/plain'
+        m.save()
+
+def reverse(apps, schema_editor):
+    pass
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('message', '0009_fix_address_lists'),
+    ]
+
+    operations = [
+        migrations.RunPython(forward, reverse),
+    ]