use Pydantic's try_eval_type if available (otherwise deprecation warn…

…ing)
fastapi · tiangolo · Apr 23, 2026 · Mar 12, 2026 · Mar 12, 2026 · Mar 12, 2026
commit 5fe7833bb74851ec3e99a03e7ee4462b9468c075
diff --git a/fastapi/_compat/v2.py b/fastapi/_compat/v2.py
@@ -22,10 +22,10 @@
 from pydantic import PydanticSchemaGenerationError as PydanticSchemaGenerationError
 from pydantic import PydanticUndefinedAnnotation as PydanticUndefinedAnnotation
 from pydantic import ValidationError as ValidationError
+from pydantic._internal import _typing_extra as _pydantic_typing_extra
 from pydantic._internal._schema_generation_shared import (  # type: ignore[attr-defined]
     GetJsonSchemaHandler as GetJsonSchemaHandler,
 )
-from pydantic._internal._typing_extra import eval_type_lenient
 from pydantic.fields import FieldInfo as FieldInfo
 from pydantic.json_schema import GenerateJsonSchema as _GenerateJsonSchema
 from pydantic.json_schema import JsonSchemaValue as JsonSchemaValue
@@ -38,7 +38,11 @@
 
 RequiredParam = PydanticUndefined
 Undefined = PydanticUndefined
-evaluate_forwardref = eval_type_lenient
+
+# eval_type_lenient has been deprecated since Pydantic v2.10.0b1 (PR #10530)
+evaluate_forwardref = getattr(_pydantic_typing_extra, "try_eval_type", None)
+if evaluate_forwardref is None:
+    evaluate_forwardref = getattr(_pydantic_typing_extra, "eval_type_lenient")
 
 
 class GenerateJsonSchema(_GenerateJsonSchema):