Add SubEvent.last_modified

src/pretix/api/serializers/event.py

@@ -369,7 +369,7 @@ class SubEventSerializer(I18nAwareModelSerializer):
         fields = ('id', 'name', 'date_from', 'date_to', 'active', 'date_admission',
                   'presale_start', 'presale_end', 'location', 'geo_lat', 'geo_lon', 'event', 'is_public',
                   'seating_plan', 'item_price_overrides', 'variation_price_overrides', 'meta_data',
-                  'seat_category_mapping')
+                  'seat_category_mapping', 'last_modified')
 
     def validate(self, data):
         data = super().validate(data)

src/pretix/api/views/event.py

@@ -4,7 +4,7 @@ from django.db.models import ProtectedError, Q
 from django.utils.timezone import now
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from django_scopes import scopes_disabled
-from rest_framework import filters, views, viewsets
+from rest_framework import filters, serializers, views, viewsets
 from rest_framework.exceptions import PermissionDenied
 from rest_framework.response import Response
 
@@ -194,6 +194,7 @@ with scopes_disabled():
         is_past = django_filters.rest_framework.BooleanFilter(method='is_past_qs')
         is_future = django_filters.rest_framework.BooleanFilter(method='is_future_qs')
         ends_after = django_filters.rest_framework.IsoDateTimeFilter(method='ends_after_qs')
+        modified_since = django_filters.IsoDateTimeFilter(field_name='last_modified', lookup_expr='gte')
 
         class Meta:
             model = SubEvent
@@ -233,6 +234,8 @@ class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
     write_permission = 'can_change_event_settings'
     filter_backends = (DjangoFilterBackend, filters.OrderingFilter)
     filterset_class = SubEventFilter
+    ordering = ('date_from',)
+    ordering_fields = ('id', 'date_from', 'last_modified')
 
     def get_queryset(self):
         if getattr(self.request, 'event', None):
@@ -254,6 +257,20 @@ class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
             'subeventitem_set', 'subeventitemvariation_set', 'seat_category_mappings'
         )
 
+    def list(self, request, **kwargs):
+        date = serializers.DateTimeField().to_representation(now())
+        queryset = self.filter_queryset(self.get_queryset())
+
+        page = self.paginate_queryset(queryset)
+        if page is not None:
+            serializer = self.get_serializer(page, many=True)
+            resp = self.get_paginated_response(serializer.data)
+            resp['X-Page-Generated'] = date
+            return resp
+
+        serializer = self.get_serializer(queryset, many=True)
+        return Response(serializer.data, headers={'X-Page-Generated': date})
+
     def perform_update(self, serializer):
         original_data = self.get_serializer(instance=serializer.instance).data
         super().perform_update(serializer)

src/pretix/base/migrations/0164_subevent_last_modified.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.9 on 2020-10-15 16:12
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0163_device_security_profile'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='subevent',
+            name='last_modified',
+            field=models.DateTimeField(auto_now=True, db_index=True),
+        ),
+    ]

src/pretix/base/models/event.py

@@ -1036,6 +1036,9 @@ class SubEvent(EventMixin, LoggedModel):
     )
     seating_plan = models.ForeignKey('SeatingPlan', on_delete=models.PROTECT, null=True, blank=True,
                                      related_name='subevents')
+    last_modified = models.DateTimeField(
+        auto_now=True, db_index=True
+    )
 
     items = models.ManyToManyField('Item', through='SubEventItem')
     variations = models.ManyToManyField('ItemVariation', through='SubEventItemVariation')

src/pretix/base/orderimport.py

@@ -18,8 +18,9 @@ from i18nfield.strings import LazyI18nString
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.forms.questions import guess_country
 from pretix.base.models import (
-    ItemVariation, OrderPosition, QuestionAnswer, QuestionOption, Seat,
-    Question)
+    ItemVariation, OrderPosition, Question, QuestionAnswer, QuestionOption,
+    Seat,
+)
 from pretix.base.services.pricing import get_price
 from pretix.base.settings import (
     COUNTRIES_WITH_STATE_IN_ADDRESS, PERSON_NAME_SCHEMES,