Set start and end date from change log dates fixes #342

app/experimenter/experiments/migrations/0006_auto_20180221_1939.py

@@ -5,6 +5,25 @@ from __future__ import unicode_literals
 from django.db import migrations, models
 
 
+def update_dates(apps, schema_editor): # pragma: no cover
+    Experiment = apps.get_model('experiments', 'Experiment')
+    ExperimentChangeLog = apps.get_model('experiments', 'ExperimentChangeLog')
+
+    for experiment in Experiment.objects.all():
+        try:
+            start_date = ExperimentChangeLog.objects.get(experiment=experiment, old_status='Accepted', new_status='Launched').changed_on
+            experiment.proposed_start_date = start_date
+        except:
+            pass
+
+        try:
+            end_date = ExperimentChangeLog.objects.get(experiment=experiment, old_status='Launched', new_status='Complete').changed_on
+            experiment.proposed_end_date = end_date
+        except:
+            pass
+        experiment.save()
+
+
 class Migration(migrations.Migration):
 
     dependencies = [
@@ -27,4 +46,5 @@ class Migration(migrations.Migration):
             name='firefox_version',
             field=models.CharField(choices=[('55.0', '55.0'), ('56.0', '56.0'), ('57.0', '57.0'), ('58.0', '58.0'), ('59.0', '59.0'), ('60.0', '60.0'), ('61.0', '61.0'), ('62.0', '62.0'), ('63.0', '63.0'), ('64.0', '64.0')], max_length=255),
         ),
+        migrations.RunPython(update_dates),
     ]