add ChangeSet.last_state_update

src/c3nav/editor/migrations/0015_changeset_last_state_update.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.2 on 2017-07-05 13:48
+from __future__ import unicode_literals
+
+from django.core.exceptions import ObjectDoesNotExist
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+def forwards_func(apps, schema_editor):
+    ChangeSet = apps.get_model('editor', 'ChangeSet')
+    for changeset in ChangeSet.objects.all():
+        try:
+            changeset.last_state_update = changeset.updates.filter(state__isnull=False).latest()
+        except ObjectDoesNotExist:
+            pass
+        changeset.save()
+
+def reverse_func(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('editor', '0014_last_update_foreign_key'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='changeset',
+            name='last_state_update',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='+', to='editor.ChangeSetUpdate', verbose_name='last state update'),
+        ),
+        migrations.RunPython(forwards_func, reverse_func),
+    ]