Fix display_as_type for TypeAliasType in python 3.12 (#7929)

pydantic/_internal/_repr.py

@@ -105,7 +105,10 @@ def display_as_type(obj: Any) -> str:
             args = ', '.join(map(repr, typing_extensions.get_args(obj)))
         else:
             args = ', '.join(map(display_as_type, typing_extensions.get_args(obj)))
-        return f'{obj.__qualname__}[{args}]'
+        try:
+            return f'{obj.__qualname__}[{args}]'
+        except AttributeError:
+            return str(obj)  # handles TypeAliasType in 3.12
     elif isinstance(obj, type):
         return obj.__qualname__
     else:

tests/test_type_alias_type.py

@@ -1,5 +1,4 @@
 import datetime
-import sys
 from typing import Dict, List, Tuple, TypeVar, Union
 
 import pytest
@@ -134,7 +133,6 @@ def test_recursive_type_alias() -> None:
     }
 
 
-@pytest.mark.xfail(sys.version_info >= (3, 12), reason="TypeAliasType doesn't have __qualname__ yet")
 def test_type_alias_annotated() -> None:
     t = TypeAdapter(ShortMyList[int])
 
@@ -155,7 +153,6 @@ def test_type_alias_annotated() -> None:
     assert t.json_schema() == {'type': 'array', 'items': {'type': 'integer'}, 'maxItems': 1}
 
 
-@pytest.mark.xfail(sys.version_info >= (3, 12), reason="TypeAliasType doesn't have __qualname__ yet")
 def test_type_alias_annotated_defs() -> None:
     # force use of refs by referencing the schema in multiple places
     t = TypeAdapter(Tuple[ShortMyList[int], ShortMyList[int]])
@@ -233,7 +230,6 @@ def test_recursive_generic_type_alias() -> None:
     }
 
 
-@pytest.mark.xfail(sys.version_info >= (3, 12), reason="TypeAliasType doesn't have __qualname__ yet")
 def test_recursive_generic_type_alias_annotated() -> None:
     t = TypeAdapter(ShortRecursiveGenericAlias[int])
 
@@ -265,7 +261,6 @@ def test_recursive_generic_type_alias_annotated() -> None:
     }
 
 
-@pytest.mark.xfail(sys.version_info >= (3, 12), reason="TypeAliasType doesn't have __qualname__ yet")
 def test_recursive_generic_type_alias_annotated_defs() -> None:
     # force use of refs by referencing the schema in multiple places
     t = TypeAdapter(Tuple[ShortRecursiveGenericAlias[int], ShortRecursiveGenericAlias[int]])