From ab248d0d97bfe0a1d1031c49f5d6f4984c62739b Mon Sep 17 00:00:00 2001
From: Richard Schreiber <schreiber@rami.io>
Date: Tue, 22 Sep 2026 11:38:51 +0200
Subject: [PATCH] Change to I18nField for validation

---
 src/pretix/api/serializers/organizer.py     | 41 +++++++++++----------
 src/tests/api/test_event_meta_properties.py | 14 ++++---
 2 files changed, 29 insertions(+), 26 deletions(-)

diff --git a/src/pretix/api/serializers/organizer.py b/src/pretix/api/serializers/organizer.py
index 4a43e421b9..5fe450b722 100644
--- a/src/pretix/api/serializers/organizer.py
+++ b/src/pretix/api/serializers/organizer.py
@@ -28,6 +28,7 @@ from django.db import transaction
 from django.db.models import Q
 from django.utils.crypto import get_random_string
 from django.utils.translation import gettext, gettext_lazy as _
+from i18nfield.rest_framework import I18nField
 from rest_framework import serializers
 from rest_framework.exceptions import ValidationError
 
@@ -661,9 +662,20 @@ class MetaPropertyListField(serializers.ListField):
 
 
 class MetaPropertyDictField(serializers.DictField):
+    child_per_key = {
+        "label": I18nField()
+    }
+
     def to_representation(self, value):
         # django added unneccessary keys DELETE, ORDER through formsets, filter them here for backwards compat
-        return super().to_representation({k: value[k] for k in ("key", "label") if k in value})
+        d = {
+            "key": value["key"]
+        }
+        if "label" in value:
+            f = I18nField()
+            d["label"] = f.to_representation(value["label"])
+
+        return super().to_representation(d)
 
     def to_internal_value(self, data):
         if not isinstance(data, dict):
@@ -675,30 +687,19 @@ class MetaPropertyDictField(serializers.DictField):
         if any(k not in {"key", "label"} for k in data.keys()):
             raise ValidationError("Meta properties may only have a key and optionally a label.")
 
+        if "label" in data:
+            f = I18nField()
+            try:
+                data["label"] = f.to_internal_value(data["label"])
+            except ValidationError as e:
+                raise ValidationError({"label": e.detail})
+
         return super().to_internal_value(data)
 
 
-class I18nField(serializers.Field):
-    def to_representation(self, value):
-        return value
-
-    def to_internal_value(self, data):
-        if isinstance(data, str):
-            return data
-        if not isinstance(data, dict):
-            raise ValidationError("Must either be a string or a dict.")
-        if not all(isinstance(k, str) for k in data.keys()):
-            raise ValidationError("All keys must be strings.")
-        if not all(isinstance(v, str) for v in data.values()):
-            raise ValidationError("All values must be strings.")
-
-
 class EventMetaPropertiesSerializer(I18nAwareModelSerializer):
     choices = MetaPropertyListField(
-        child=MetaPropertyDictField(
-            # careful: this only works because I18nField allows plain strings (e.g. keys need to be plain strings)
-            child=I18nField()
-        ),
+        child=MetaPropertyDictField(),
         allow_null=True,
     )
 
diff --git a/src/tests/api/test_event_meta_properties.py b/src/tests/api/test_event_meta_properties.py
index c3ff640cad..ebd6924da1 100644
--- a/src/tests/api/test_event_meta_properties.py
+++ b/src/tests/api/test_event_meta_properties.py
@@ -21,6 +21,7 @@
 #
 import pytest
 from django_scopes import scopes_disabled
+from i18nfield.strings import LazyI18nString
 
 
 @pytest.fixture
@@ -32,7 +33,7 @@ def event_meta_property(organizer):
         choices=[
             {
                 "key": "Red",
-                "label": "Rot",
+                "label": LazyI18nString("Rot"),
                 "DELETE": False,
                 "ORDER": 1,
             }
@@ -44,7 +45,7 @@ TEST_TYPE_RES = {
     "name": "Color",
     "default": "Red",
     "required": False,
-    "choices": [{"key": "Red", "label": "Rot"}],
+    "choices": [{"key": "Red", "label": {"en": "Rot"}}],
     'filter_allowed': True,
     'filter_public': False,
     'protected': False,
@@ -120,8 +121,8 @@ def test_meta_property_create(token_client, organizer):
             "default": "r",
             "required": False,
             "choices": [
-                {"key": "r", "label": "Red"},
-                {"key": "r", "label": "Razzmatazz"},
+                {"key": "r", "label": {"en": "Red"}},
+                {"key": "r", "label": {"en": "Razzmatazz"}},
             ],
         }
     )
@@ -192,8 +193,9 @@ def test_meta_property_patch(token_client, organizer, event_meta_property):
         }
     )
     assert resp.status_code == 400
-    assert str(resp.data["choices"][0]["label"][0]) == "Must either be a string or a dict."
-    assert str(resp.data["choices"][1]["label"][0]) == "All values must be strings."
+    #assert resp.data == 123
+    assert str(resp.data["choices"][0]["label"][0]) == "Invalid data type."
+    assert str(resp.data["choices"][1]["label"][0]) == "All entries must be strings."
 
 
     resp = token_client.patch(