Event settings: Extend product metadata (Z#23116647) (#3241)

Co-authored-by: Richard Schreiber <schreiber@rami.io>
Co-authored-by: Raphael Michel <michel@rami.io>

src/pretix/api/serializers/event.py

@@ -50,7 +50,9 @@ 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.event import SubEvent
-from pretix.base.models.items import SubEventItem, SubEventItemVariation
+from pretix.base.models.items import (
+    ItemMetaProperty, SubEventItem, SubEventItemVariation,
+)
 from pretix.base.services.seating import (
     SeatProtected, generate_seats, validate_plan_change,
 )
@@ -904,3 +906,23 @@ class DeviceEventSettingsSerializer(EventSettingsSerializer):
                 else []
             )
         )
+
+
+class MultiLineStringField(serializers.Field):
+
+    def to_representation(self, value):
+        return [v.strip() for v in value.splitlines()]
+
+    def to_internal_value(self, data):
+        if isinstance(data, list) and len(data) > 0:
+            return "\n".join(data)
+        else:
+            raise ValidationError('Invalid data type.')
+
+
+class ItemMetaPropertiesSerializer(I18nAwareModelSerializer):
+    allowed_values = MultiLineStringField(allow_null=True)
+
+    class Meta:
+        model = ItemMetaProperty
+        fields = ('id', 'name', 'default', 'required', 'allowed_values')