From ec213fa26edc890db62c8692b004c128f3ac200d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebasti=C3=A1n=20Ram=C3=ADrez?= <tiangolo@gmail.com>
Date: Fri, 26 Dec 2025 20:31:38 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=94=A5=20Remove=20more=20unused=20referen?=
 =?UTF-8?q?ces=20to=20Pydantic=20v1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 fastapi/dependencies/utils.py |  7 +------
 fastapi/encoders.py           |  2 --
 fastapi/routing.py            | 30 ------------------------------
 3 files changed, 1 insertion(+), 38 deletions(-)

diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 088c38130..cbf183774 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -48,7 +48,7 @@ from fastapi.concurrency import (
     contextmanager_in_threadpool,
 )
 from fastapi.dependencies.models import Dependant
-from fastapi.exceptions import DependencyScopeError, PydanticV1NotSupportedError
+from fastapi.exceptions import DependencyScopeError
 from fastapi.logger import logger
 from fastapi.security.oauth2 import SecurityScopes
 from fastapi.types import DependencyCacheKey
@@ -318,11 +318,6 @@ def get_dependant(
             )
             continue
         assert param_details.field is not None
-        if isinstance(param_details.field, may_v1.ModelField):
-            raise PydanticV1NotSupportedError(
-                "pydantic.v1 models are no longer supported by FastAPI."
-                f" Please update the param {param_name}: {param_details.type_annotation!r}."
-            )
         if isinstance(param_details.field.field_info, params.Body):
             dependant.body_params.append(param_details.field)
         else:
diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index 82ae2f550..453ed463c 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -234,8 +234,6 @@ def jsonable_encoder(
             exclude_none=exclude_none,
             exclude_defaults=exclude_defaults,
         )
-        if "__root__" in obj_dict:
-            obj_dict = obj_dict["__root__"]
         return jsonable_encoder(
             obj_dict,
             exclude_none=exclude_none,
diff --git a/fastapi/routing.py b/fastapi/routing.py
index 4568077ef..66e313e6e 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -144,36 +144,6 @@ def websocket_session(
     return app
 
 
-def _prepare_response_content(
-    res: Any,
-    *,
-    exclude_unset: bool,
-    exclude_defaults: bool = False,
-    exclude_none: bool = False,
-) -> Any:
-    if isinstance(res, list):
-        return [
-            _prepare_response_content(
-                item,
-                exclude_unset=exclude_unset,
-                exclude_defaults=exclude_defaults,
-                exclude_none=exclude_none,
-            )
-            for item in res
-        ]
-    elif isinstance(res, dict):
-        return {
-            k: _prepare_response_content(
-                v,
-                exclude_unset=exclude_unset,
-                exclude_defaults=exclude_defaults,
-                exclude_none=exclude_none,
-            )
-            for k, v in res.items()
-        }
-    return res
-
-
 def _merge_lifespan_context(
     original_context: Lifespan[Any], nested_context: Lifespan[Any]
 ) -> Lifespan[Any]: