Fix migrations for trashbin feature

dav_registration/migrations/0007_auto_20201208_1853.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.29 on 2020-12-08 17:53
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def migrate_registration_status(apps, schema_editor):
+    Registration = apps.get_model('dav_registration', 'Registration')
+    RegistrationStatus = apps.get_model('dav_registration', 'RegistrationStatus')
+    db_alias = schema_editor.connection.alias
+    for r in Registration.objects.using(db_alias).all():
+        s = RegistrationStatus(registration=r)
+        s.answered = r.answered
+        s.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dav_registration', '0006_auto_20201203_1144'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_registration_status),
+    ]