Tweaked Message.msgid and added needed migrations for the field. The first migration creates the new column with NULL values for existing rows, the second adds creation of msgid values by default for new rows.

- Legacy-Id: 12961

ietf/message/migrations/0003_message_msgid.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-03-03 13:04
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('message', '0002_messageattachment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='message',
+            name='msgid',
+            field=models.CharField(blank=True, default=None, max_length=255, null=True),
+        ),
+    ]

ietf/message/migrations/0004_auto_20170303_1310.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-03-03 13:10
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import email.utils
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('message', '0003_message_msgid'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='message',
+            name='msgid',
+            field=models.CharField(blank=True, default=email.utils.make_msgid, max_length=255, null=True),
+        ),
+    ]

ietf/message/models.py

@@ -21,7 +21,7 @@ class Message(models.Model):
     reply_to = models.CharField(max_length=255, blank=True)
     body = models.TextField()
     content_type = models.CharField(default="text/plain", max_length=255, blank=True)
-    msgid = models.CharField(max_length=255, blank=True, default=email.utils.make_msgid)
+    msgid = models.CharField(max_length=255, blank=True, null=True, default=email.utils.make_msgid)
 
     related_groups = models.ManyToManyField(Group, blank=True)
     related_docs = models.ManyToManyField(Document, blank=True)