Add Experiment Change Log fixes #157

app/experimenter/experiments/migrations/0014_auto_20170815_1544.py

@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2017-08-15 15:44
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('experiments', '0013_auto_20170711_1745'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ExperimentChangeLog',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('changed_on', models.DateTimeField(auto_now_add=True)),
+                ('changed_by', models.CharField(max_length=255)),
+                ('message', models.TextField()),
+            ],
+            options={
+                'verbose_name': 'Experiment Change Log',
+                'verbose_name_plural': 'Experiment Change Logs',
+            },
+        ),
+        migrations.AlterField(
+            model_name='experiment',
+            name='status',
+            field=models.CharField(choices=[('Created', 'Created'), ('Pending Review', 'Pending Review'), ('Accepted', 'Accepted'), ('Launched', 'Launched'), ('Complete', 'Complete'), ('Rejected', 'Rejected')], default='Created', max_length=255),
+        ),
+        migrations.AddField(
+            model_name='experimentchangelog',
+            name='experiment',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='changes', to='experiments.Experiment'),
+        ),
+    ]

app/experimenter/experiments/models.py

@@ -152,3 +152,25 @@ class ExperimentVariant(models.Model):
             experiment_slug=self.experiment.slug,
             variant_slug=self.slug,
         )
+
+
+class ExperimentChangeLog(models.Model):
+    experiment = models.ForeignKey(
+        Experiment, blank=False, null=False, related_name='changes')
+    changed_on = models.DateTimeField(auto_now_add=True)
+    changed_by = models.CharField(max_length=255, blank=False, null=False)
+    message = models.TextField()
+
+    def __str__(self):  # pragma: no cover
+        return (
+            '{changed_by} changed {experiment} on {datetime}: {message}'
+        ).format(
+            changed_by=self.changed_by,
+            experiment=self.experiment,
+            datetime=self.changed_on,
+            message=self.message,
+        )
+
+    class Meta:
+        verbose_name = 'Experiment Change Log'
+        verbose_name_plural = 'Experiment Change Logs'

app/experimenter/openidc/tests/test_middleware.py

@@ -22,7 +22,7 @@ class OpenIDCAuthMiddlewareTests(TestCase):
         self.assertFalse(Group.objects.all().exists())
         group = self.middleware.get_experimenter_group()
         self.assertTrue(Group.objects.all().exists())
-        self.assertEqual(group.permissions.all().count(), 9)
+        self.assertEqual(group.permissions.all().count(), 12)
         self.assertEqual(
             set([
                 permission.content_type.app_label for