From fdf4da0f1d37ad2fda3928ca7092a78d9d1fc16a Mon Sep 17 00:00:00 2001
From: PRESSO <caff1nepill@gmail.com>
Date: Sun, 29 Jun 2025 17:02:52 +0900
Subject: [PATCH] fix: ModelField alias property

---
 fastapi/_compat.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fastapi/_compat.py b/fastapi/_compat.py
index 227ad837d..aac167b02 100644
--- a/fastapi/_compat.py
+++ b/fastapi/_compat.py
@@ -93,7 +93,13 @@ if PYDANTIC_V2:
 
         @property
         def alias(self) -> str:
-            a = self.field_info.alias
+            match self.mode:
+                case "validation" if self.field_info.validation_alias is not None:
+                    a = self.field_info.validation_alias
+                case "serialization" if self.field_info.serialization_alias is not None:
+                    a = self.field_info.serialization_alias
+                case _:
+                    a = self.field_info.alias
             return a if a is not None else self.name
 
         @property