Fix config detection for TypedDict from grandparent classes

pydantic/_internal/_generate_schema.py

@@ -67,6 +67,7 @@
     ModelValidatorDecoratorInfo,
     RootValidatorDecoratorInfo,
     ValidatorDecoratorInfo,
+    get_attribute_from_bases,
     inspect_field_serializer,
     inspect_model_serializer,
     inspect_validator,
@@ -1057,11 +1058,10 @@ def _typed_dict_schema(self, typed_dict_cls: Any, origin: Any) -> core_schema.Co
                     code='typed-dict-version',
                 )
 
-            config: ConfigDict | None = None
-            for base in (typed_dict_cls, *typed_dict_cls.__orig_bases__):
-                config = getattr(base, '__pydantic_config__', None)
-                if config is not None:
-                    break
+            try:
+                config: ConfigDict | None = get_attribute_from_bases(typed_dict_cls, '__pydantic_config__')
+            except AttributeError:
+                config = None
 
             with self._config_wrapper_stack.push(config):
                 core_config = self._config_wrapper.core_config(typed_dict_cls)

tests/test_types_typeddict.py

@@ -890,3 +890,18 @@ class Model(TypedDict):
     ta = TypeAdapter(Model)
 
     assert ta.validate_python(dict(x=1))['x'] == '1'
+
+
+def test_grandparent_config():
+    class MyTypedDict(TypedDict):
+        __pydantic_config__ = ConfigDict(str_to_lower=True)
+        x: str
+
+    class MyMiddleTypedDict(MyTypedDict):
+        y: str
+
+    class MySubTypedDict(MyMiddleTypedDict):
+        z: str
+
+    validated_data = TypeAdapter(MySubTypedDict).validate_python({'x': 'ABC', 'y': 'DEF', 'z': 'GHI'})
+    assert validated_data == {'x': 'abc', 'y': 'def', 'z': 'ghi'}