Clear settings cache after migration

src/pretix/base/migrations/0061_auto_20170521_0942.py

@@ -2,6 +2,7 @@
 # Generated by Django 1.10.7 on 2017-05-21 09:42
 from __future__ import unicode_literals
 
+from django.core.cache import cache
 from django.db import migrations
 
 
@@ -12,6 +13,7 @@ def rename_placeholder(app, schema_editor):
         if setting.key == 'mail_text_order_placed':
             new_value = setting.value.replace('{paymentinfo}', '{payment_info}')
             setting.value = new_value
+            cache.delete('hierarkey_{}_{}'.format('event', setting.object_id))
             setting.save()
 
 
@@ -21,5 +23,5 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(rename_placeholder)
+        migrations.RunPython(rename_placeholder, migrations.RunPython.noop)
     ]

src/pretix/plugins/sendmail/views.py

@@ -16,6 +16,7 @@ from pretix.base.models import InvoiceAddress, LogEntry, Order
 from pretix.base.services.mail import SendMailException, mail
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.multidomain.urlreverse import build_absolute_uri
+
 from . import forms
 
 logger = logging.getLogger('pretix.plugins.sendmail')

src/pretix/plugins/ticketoutputpdf/views.py

@@ -21,6 +21,7 @@ from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.control.views import ChartContainingView
 from pretix.helpers.database import rolledback_transaction
 from pretix.plugins.ticketoutputpdf.signals import get_fonts
+
 from .ticketoutput import PdfTicketOutput
 
 logger = logging.getLogger(__name__)