feat: optimize model service

app/utils/create_module_service.py

@@ -1,7 +1,7 @@
 import asyncio
 import datetime
 import json
-from typing import Type, List, Any, Union
+from typing import Type, List, Any, Union, Optional
 
 from fastapi import FastAPI, APIRouter, HTTPException, Body
 from pydantic import create_model, BaseModel
@@ -101,7 +101,7 @@ def create_model_service(
       # 动态创建分页查询的响应模型：包含数据列表和是否有下一页的标识
       ListResponse = create_model(f"{Cls.__name__}ListResponse", list=(List[Cls], ...), has_next=(bool, ...), total=(Union[int, None], None))
       # 动态创建单条查询的响应模型：包含单个模型实例
-      ItemResponse = create_model(f"{Cls.__name__}ItemResponse", result=(Cls, ...))
+      ItemResponse = create_model(f"{Cls.__name__}ItemResponse", result=(Optional[Cls], ...))
       # 动态创建批量操作的响应模型：包含操作后的模型实例列表
       BatchResponse = create_model(f"{Cls.__name__}BatchResponse", result=(List[Cls], ...))
       # 动态创建批量删除的响应模型：包含删除操作是否成功的标识
@@ -297,7 +297,7 @@ def create_model_service(
       # 返回第一条匹配的记录（若存在）
       item_cls = result.scalars().first()
 
-      if after_query_item is not None:
+      if after_query_item is not None and item_cls is not None:
         await after_query_item(item_cls, row_dict, session)
 
       return item_cls