Do not show invisible questions in order overview

src/pretix/base/models/orders.py

@@ -946,16 +946,38 @@ class AbstractPosition(models.Model):
         # selected via prefetch_related
         if not all:
             if hasattr(self.item, 'questions_to_ask'):
-                self.questions = list(copy.copy(q) for q in self.item.questions_to_ask)
+                questions = list(copy.copy(q) for q in self.item.questions_to_ask)
             else:
-                self.questions = list(copy.copy(q) for q in self.item.questions.filter(ask_during_checkin=False))
+                questions = list(copy.copy(q) for q in self.item.questions.filter(ask_during_checkin=False))
         else:
-            self.questions = list(copy.copy(q) for q in self.item.questions.all())
+            questions = list(copy.copy(q) for q in self.item.questions.all())
-        for q in self.questions:
+
+        question_cache = {
+            q.pk: q for q in questions
+        }
+
+        def question_is_visible(parentid, qval):
+            parentq = question_cache[parentid]
+            if parentq.dependency_question_id and not question_is_visible(parentq.dependency_question_id, parentq.dependency_value):
+                return False
+            if parentid not in self.answ:
+                return False
+            if qval == 'True':
+                return self.answ[parentid].answer == 'True'
+            elif qval == 'False':
+                return self.answ[parentid].answer == 'False'
+            else:
+                return qval in [o.identifier for o in self.answ[parentid].options.all()]
+
+        self.questions = []
+        for q in questions:
             if q.id in self.answ:
                 q.answer = self.answ[q.id]
+                q.answer.question = q  # cache object
             else:
                 q.answer = ""
+            if not q.dependency_question_id or question_is_visible(q.dependency_question_id, q.dependency_value):
+                self.questions.append(q)
 
     @property
     def net_price(self):

src/pretix/control/views/orders.py

@@ -12,7 +12,7 @@ from django.contrib import messages
 from django.core.files import File
 from django.db import transaction
 from django.db.models import (
-    Count, IntegerField, OuterRef, ProtectedError, Q, Subquery, Sum,
+    Count, IntegerField, OuterRef, Prefetch, ProtectedError, Q, Subquery, Sum,
 )
 from django.http import (
     FileResponse, Http404, HttpResponseNotAllowed, JsonResponse,
@@ -234,7 +234,9 @@ class OrderDetail(OrderView):
         ).select_related(
             'item', 'variation', 'addon_to', 'tax_rule'
         ).prefetch_related(
-            'item__questions', 'answers', 'answers__question', 'checkins', 'checkins__list'
+            'item__questions',
+            Prefetch('answers', queryset=QuestionAnswer.objects.prefetch_related('options').select_related('question')),
+            'checkins', 'checkins__list'
         ).order_by('positionid')
 
         positions = []

src/pretix/presale/views/__init__.py

@@ -5,13 +5,15 @@ from functools import wraps
 from itertools import groupby
 
 from django.conf import settings
-from django.db.models import Sum
+from django.db.models import Prefetch, Sum
 from django.utils.decorators import available_attrs
 from django.utils.functional import cached_property
 from django.utils.timezone import now
 
 from pretix.base.i18n import language
-from pretix.base.models import CartPosition, InvoiceAddress, OrderPosition
+from pretix.base.models import (
+    CartPosition, InvoiceAddress, OrderPosition, QuestionAnswer,
+)
 from pretix.base.services.cart import get_fees
 from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.signals import question_form_fields
@@ -48,7 +50,7 @@ class CartMixin:
             prefetch = []
             if answers:
                 prefetch.append('item__questions')
-                prefetch.append('answers')
+                prefetch.append(Prefetch('answers', queryset=QuestionAnswer.objects.prefetch_related('options')))
 
             cartpos = queryset.order_by(
                 'item__category__position', 'item__category_id', 'item__position', 'item__name', 'variation__value'