feat(members/waitinglist): refine wait confirmation status

Rework the wait cofirmation status shown in the admin: If there is a pending wait confirmation
request (i.e. the number of sent reminders is positive), the status is either `None` (i.e. undecided)
or `False`. Otherwise the status is `True`.

jdav_web/members/models.py

@@ -938,10 +938,17 @@ class MemberWaitingList(Person):
 
     def waiting_confirmed(self):
         """Returns if the persons waiting status is considered to be confirmed."""
-        cutoff = timezone.now() \
-            - timezone.timedelta(days=  settings.GRACE_PERIOD_WAITING_CONFIRMATION \
-                                      + settings.WAITING_CONFIRMATION_FREQUENCY)
-        return self.last_wait_confirmation > cutoff.date()
+        if self.sent_reminders > 0:
+            # there was sent at least one wait confirmation request
+            if timezone.now() < self.wait_confirmation_key_expire:
+                # the request has not expired yet
+                return None
+            else:
+                # we sent a request that has expired
+                return False
+        else:
+            # if there exist no pending or expired reminders, the waiter remains confirmed
+            return True
     waiting_confirmed.admin_order_field = 'last_wait_confirmation'
     waiting_confirmed.boolean = True
     waiting_confirmed.short_description = _('Waiting status confirmed')

jdav_web/members/tests.py

@@ -1479,15 +1479,14 @@ class ConfirmWaitingViewTestCase(BasicMemberTestCase):
         self.assertEqual(waiter.leave_key, '')
 
     def test_get_expired(self):
-        self.waiter.last_wait_confirmation = datetime.date(1900, 1, 1)
-        self.waiter.save()
-        # after setting the last wait confirmation to an old date, the waiting status
-        # should be unconfirmed
-        self.assertFalse(self.waiter.waiting_confirmed())
+        # waiter has a pending confirmation request
+        self.assertEqual(self.waiter.waiting_confirmed(), None)
 
         url = reverse('members:confirm_waiting')
         self.waiter.wait_confirmation_key_expire = timezone.now() - timezone.timedelta(days=10)
         self.waiter.save()
+        # waiter has pending confirmation request, but request has expired
+        self.assertEqual(self.waiter.waiting_confirmed(), False)
         response = self.client.get(url, data={'key': self.key})
         self.assertEqual(response.status_code, HTTPStatus.OK)
         self.assertContains(response, _('rejoin the waiting list'))