Fix a naming issue with JSON schema for generics parametrized by recu…

…rsive type aliases (#8389)

pydantic/_internal/_repr.py

@@ -93,6 +93,8 @@ def display_as_type(obj: Any) -> str:
         return '...'
     elif isinstance(obj, Representation):
         return repr(obj)
+    elif isinstance(obj, typing_extensions.TypeAliasType):
+        return str(obj)
 
     if not isinstance(obj, (_typing_extra.typing_base, _typing_extra.WithArgsTypes, type)):
         obj = obj.__class__

tests/test_type_alias_type.py

@@ -1,5 +1,6 @@
 import datetime
-from typing import Dict, List, Tuple, TypeVar, Union
+from dataclasses import dataclass
+from typing import Dict, Generic, List, Tuple, TypeVar, Union
 
 import pytest
 from annotated_types import MaxLen
@@ -133,6 +134,18 @@ def test_recursive_type_alias() -> None:
     }
 
 
+def test_recursive_type_alias_name():
+    T = TypeVar('T')
+
+    @dataclass
+    class MyGeneric(Generic[T]):
+        field: T
+
+    MyRecursiveType = TypeAliasType('MyRecursiveType', Union[MyGeneric['MyRecursiveType'], int])
+    json_schema = TypeAdapter(MyRecursiveType).json_schema()
+    assert sorted(json_schema['$defs'].keys()) == ['MyGeneric_MyRecursiveType_', 'MyRecursiveType']
+
+
 def test_type_alias_annotated() -> None:
     t = TypeAdapter(ShortMyList[int])