Migration for digest_sha256 != NULL and no cascading deletion

ivatar/ivataraccount/migrations/0007_auto_20180627_0624.py

@@ -0,0 +1,39 @@
+# Generated by Django 2.0.6 on 2018-06-27 06:24
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+def add_sha256(apps, schema_editor):
+     '''
+     Make sure all ConfirmedEmail have digest_sha256 set
+     in order to alter the model so sha256 may not be NULL
+     '''
+     ConfirmedEmail = apps.get_model('ivataraccount', 'ConfirmedEmail')
+     for mail in ConfirmedEmail.objects.filter(digest_sha256=None):
+         mail.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ivataraccount', '0006_auto_20180626_1445'),
+    ]
+
+    operations = [
+        migrations.RunPython(add_sha256),
+        migrations.AlterField(
+            model_name='confirmedemail',
+            name='digest_sha256',
+            field=models.CharField(max_length=64),
+        ),
+        migrations.AlterField(
+            model_name='confirmedemail',
+            name='photo',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='emails', to='ivataraccount.Photo'),
+        ),
+        migrations.AlterField(
+            model_name='confirmedopenid',
+            name='photo',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='openids', to='ivataraccount.Photo'),
+        ),
+    ]