Scheduled emails: Extend filter by subevents (Z#23122902) (#3551)

To create automated mail rules for specific subevents only, this adds a selection widget to choose which, only appearing if there are any subevents to select.

src/tests/plugins/sendmail/test_rules.py

@@ -253,6 +253,58 @@ def test_sendmail_rule_send_correct_subevent(order, event_series, subevent1, sub
     assert djmail.outbox[0].to[0] == p1.attendee_email
 
 
+@pytest.mark.django_db
+@scopes_disabled()
+def test_sendmail_rule_specified_subevent(order, event_series, subevent1, subevent2, item):
+    djmail.outbox = []
+
+    order.all_positions.create(item=item, price=13, subevent=subevent1)
+    order.all_positions.create(item=item, price=23, subevent=subevent2)
+
+    order.status = order.STATUS_PAID
+    order.save()
+
+    rule = event_series.sendmail_rules.create(date_is_absolute=False, offset_is_after=False, send_offset_days=1,
+                                              send_offset_time=datetime.time(4, 30), subevent=subevent1,
+                                              subject='meow', template='meow meow meow')
+
+    sendmail_run_rules(None)
+
+    assert len(djmail.outbox) == 1
+
+    m = ScheduledMail.objects.filter(rule=rule).first()
+    assert m.subevent == subevent1
+
+
+@pytest.mark.django_db
+@scopes_disabled()
+def test_sendmail_rule_all_subevents(event_series, subevent1, subevent2, item):
+    djmail.outbox = []
+
+    o1 = Order.objects.create(event=item.event, status=Order.STATUS_PAID,
+                              expires=now() + datetime.timedelta(hours=1),
+                              total=13, code='DUMMY', email='dummy1@dummy.test',
+                              datetime=now(), locale='en')
+    o1.all_positions.create(item=item, price=13, subevent=subevent1)
+    o1.all_positions.create(item=item, price=13, subevent=subevent2)
+    o2 = Order.objects.create(event=item.event, status=Order.STATUS_PAID,
+                              expires=now() + datetime.timedelta(hours=1),
+                              total=13, code='DUMMY', email='dummy2@dummy.test',
+                              datetime=now(), locale='en')
+    o2.all_positions.create(item=item, price=23, subevent=subevent1)
+    o2.all_positions.create(item=item, price=23, subevent=subevent2)
+
+    rule = event_series.sendmail_rules.create(date_is_absolute=False, offset_is_after=False, send_offset_days=1,
+                                              send_offset_time=datetime.time(4, 30), subevent=None,
+                                              subject='meow', template='meow meow meow')
+    sendmail_run_rules(None)
+
+    ms = ScheduledMail.objects.filter(rule=rule)
+    assert len(ms) == 2  # one for each subevent
+    assert ms.get(subevent=subevent1) is not None
+    assert ms.get(subevent=subevent2) is not None
+
+
 @pytest.mark.django_db
 @scopes_disabled()
 def test_sendmail_rule_send_correct_products(event, order, item, item2):