Add sub-events and relative date settings (#503)

* Data model

* little crud

* SubEventItemForm etc

* Drop SubEventItem.active, quota editor

* Fix failing tests

* First frontend stuff

* Addons form stuff

* Quota calculation

* net price display on EventIndex

* Add tests, solve some bugs

* Correct quota selection in more places, consolidate pricing logic

* Fix failing quota tests

* Fix TypeError

* Add tests for checkout

* Fixed a bug in QuotaForm

* Prevent immutable cart if a quota was removed from an item

* Add tests for pricing

* Handle waiting list

* Filter in check-in list

* Fixed import lost in rebase

* Fix waiting list widget

* Voucher management

* Voucher redemption

* Fix broken tests

* Add subevents to OrderChangeManager

* Create a subevent during event creation

* Fix bulk voucher creation

* Introduce subevent.active

* Copy from for subevents

* Show active in list

* ICal download for subevents

* Check start and end of presale

* Failing tests / show cart logic

* Test

* Rebase migrations

* REST API integration of sub-events

* Integrate quota calculation into the traditional quota form

* Make subevent argument to add_position optional

* Log-display foo

* pretixdroid and subevents

* Filter by subevent

* Add more tests

* Some mor tests

* Rebase fixes

* More tests

* Relative dates

* Restrict selection in relative datetime widgets

* Filter subevent list

* Re-label has_subevents

* Rebase fixes, subevents in calendar view

* Performance and caching issues

* Refactor calendar templates

* Permission tests

* Calendar fixes and month selection

* subevent selection

* Rename subevents to dates

* Add tests for calendar views

src/pretix/plugins/sendmail/views.py

@@ -13,6 +13,7 @@ from django.views.generic import FormView, ListView
 
 from pretix.base.i18n import LazyI18nString, language
 from pretix.base.models import InvoiceAddress, LogEntry, Order
+from pretix.base.models.event import SubEvent
 from pretix.base.services.mail import SendMailException, mail
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.multidomain.urlreverse import build_absolute_uri
@@ -43,6 +44,13 @@ class SenderView(EventPermissionRequiredMixin, FormView):
                     'subject': LazyI18nString(logentry.parsed_data['subject']),
                     'sendto': logentry.parsed_data['sendto'],
                 }
+                if logentry.parsed_data.get('subevent'):
+                    try:
+                        kwargs['initial']['subevent'] = self.request.event.subevents.get(
+                            pk=logentry.parsed_data['subevent']['id']
+                        )
+                    except SubEvent.DoesNotExist:
+                        pass
             except LogEntry.DoesNotExist:
                 raise Http404(_('You supplied an invalid log entry ID'))
         return kwargs
@@ -57,6 +65,8 @@ class SenderView(EventPermissionRequiredMixin, FormView):
         if 'overdue' in form.cleaned_data['sendto']:
             statusq |= Q(status=Order.STATUS_PENDING, expires__lt=now())
         orders = qs.filter(statusq)
+        if form.cleaned_data.get('subevent'):
+            orders = orders.filter(positions__subevent__in=(form.cleaned_data.get('subevent'),)).distinct()
 
         tz = pytz.timezone(self.request.event.settings.timezone)
 
@@ -119,7 +129,7 @@ class SenderView(EventPermissionRequiredMixin, FormView):
                         data={
                             'subject': form.cleaned_data['subject'],
                             'message': form.cleaned_data['message'],
-                            'recipient': o.email
+                            'recipient': o.email,
                         }
                     )
             except SendMailException:
@@ -175,5 +185,10 @@ class EmailHistoryView(EventPermissionRequiredMixin, ListView):
             log.pdata['sendto'] = [
                 status[s] for s in log.pdata['sendto']
             ]
+            if log.pdata.get('subevent'):
+                try:
+                    log.pdata['subevent_obj'] = self.request.event.subevents.get(pk=log.pdata['subevent']['id'])
+                except SubEvent.DoesNotExist:
+                    pass
 
         return ctx