From b8ade13b61ba7b7bfd05300192de3038f1f1b7fe Mon Sep 17 00:00:00 2001
From: duxingchen <duxingchen@iris-rs.cn>
Date: Thu, 13 Aug 2026 09:03:17 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20TaskRecordResponse=E6=94=B9=E7=94=A8fiel?=
 =?UTF-8?q?d=5Fvalidator=20=E2=80=94=20=E4=B8=8D=E5=86=8D=E6=B1=A1?=
 =?UTF-8?q?=E6=9F=93ORM=E5=AF=B9=E8=B1=A1=E5=AF=BC=E8=87=B4=E5=9B=BE?=
 =?UTF-8?q?=E7=89=87=E5=88=97=E8=A1=A8=E5=86=99=E5=9B=9EVARCHAR=E6=8A=A5?=
 =?UTF-8?q?=E9=94=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

根因: model_validate直接obj.images=json.loads()把ORM对象的字符串改成列表
     SQLAlchemy autoflush时把列表写回VARCHAR列 → DataError
修复: field_validator(mode=before)在序列化层转换, 不修改ORM源对象
---
 backend/app/schemas/task.py | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/backend/app/schemas/task.py b/backend/app/schemas/task.py
index d63627a..ea1231b 100644
--- a/backend/app/schemas/task.py
+++ b/backend/app/schemas/task.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import uuid
 from datetime import datetime
 from typing import Optional
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, field_validator
 
 
 # ============================================================
@@ -82,18 +82,19 @@ class TaskRecordResponse(BaseModel):
 
     model_config = {"from_attributes": True}
 
+    @field_validator("images", mode="before")
     @classmethod
-    def model_validate(cls, obj, **kwargs):
-        """处理 DB 中 images 的 JSON 字符串 → list 反序列化"""
+    def _parse_images(cls, v):
+        """处理 DB 中 images 的 JSON 字符串 → list 反序列化（不污染 ORM 对象）"""
         import json
-        if hasattr(obj, "images") and isinstance(obj.images, str):
+        if isinstance(v, str):
             try:
-                obj.images = json.loads(obj.images)
+                return json.loads(v)
             except (json.JSONDecodeError, TypeError):
-                obj.images = []
-        elif hasattr(obj, "images") and obj.images is None:
-            obj.images = []
-        return super().model_validate(obj, **kwargs)
+                return []
+        if v is None:
+            return []
+        return v
 
 
 # ============================================================