New implementation of sales channels (#4111)

Co-authored-by: Martin Gross <gross@rami.io>

src/pretix/api/serializers/event.py

@@ -46,10 +46,14 @@ from rest_framework import serializers
 from rest_framework.fields import ChoiceField, Field
 from rest_framework.relations import SlugRelatedField
 
-from pretix.api.serializers import CompatibleJSONField
+from pretix.api.serializers import (
+    CompatibleJSONField, SalesChannelMigrationMixin,
+)
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.api.serializers.settings import SettingsSerializer
-from pretix.base.models import Device, Event, TaxRule, TeamAPIToken
+from pretix.base.models import (
+    Device, Event, SalesChannel, TaxRule, TeamAPIToken,
+)
 from pretix.base.models.event import SubEvent
 from pretix.base.models.items import (
     ItemMetaProperty, SubEventItem, SubEventItemVariation,
@@ -161,7 +165,7 @@ class ValidKeysField(Field):
         }
 
 
-class EventSerializer(I18nAwareModelSerializer):
+class EventSerializer(SalesChannelMigrationMixin, I18nAwareModelSerializer):
     meta_data = MetaDataField(required=False, source='*')
     item_meta_properties = MetaPropertyField(required=False, source='*')
     plugins = PluginsField(required=False, source='*')
@@ -170,6 +174,13 @@ class EventSerializer(I18nAwareModelSerializer):
     valid_keys = ValidKeysField(source='*', read_only=True)
     best_availability_state = serializers.IntegerField(allow_null=True, read_only=True)
     public_url = serializers.SerializerMethodField('get_event_url', read_only=True)
+    limit_sales_channels = serializers.SlugRelatedField(
+        slug_field="identifier",
+        queryset=SalesChannel.objects.none(),
+        required=False,
+        allow_empty=True,
+        many=True,
+    )
 
     def get_event_url(self, event):
         return build_absolute_uri(event, 'presale:event.index')
@@ -180,7 +191,7 @@ class EventSerializer(I18nAwareModelSerializer):
                   'date_to', 'date_admission', 'is_public', 'presale_start',
                   'presale_end', 'location', 'geo_lat', 'geo_lon', 'has_subevents', 'meta_data', 'seating_plan',
                   'plugins', 'seat_category_mapping', 'timezone', 'item_meta_properties', 'valid_keys',
-                  'sales_channels', 'best_availability_state', 'public_url')
+                  'all_sales_channels', 'limit_sales_channels', 'best_availability_state', 'public_url')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -188,6 +199,7 @@ class EventSerializer(I18nAwareModelSerializer):
             self.fields.pop('valid_keys')
         if not self.context.get('request') or 'with_availability_for' not in self.context['request'].GET:
             self.fields.pop('best_availability_state')
+        self.fields['limit_sales_channels'].child_relation.queryset = self.context['organizer'].sales_channels.all()
 
     def validate(self, data):
         data = super().validate(data)