英文:
FastAPI SQLAlchemy cannot convert dictionary update sequence element #0 to a sequence
问题
错误：
ValueError: [TypeError('无法将字典更新序列元素 #0 转换为序列'), TypeError('vars() 参数必须具有 __dict__ 属性')]
英文:
I'm trying to return list of operations and getting error
@router.get("/")async def get_specific_operations(operation_type: str, session: AsyncSession = Depends(get_async_session)):query = select(operation).where(operation.c.type == operation_type)result = await session.execute(query)return result.all()
Error:
ValueError: [TypeError('cannot convert dictionary update sequence element #0 to a sequence'), TypeError('vars() argument must have __dict__ attribute')]
答案1
得分: 1
尝试使用 result.scalars().all() 而不是 result.all()。
英文:
try instead of result.all() to do this result.scalars().all()
答案2
得分: 0
在@matslindh的答案中添加一些细节：
- 在你的
schemas.py中定义响应模型，添加model_config
class Operation(BaseModel):model_config: ConfigDict(from_attributes=True)prop1: type1prop2: type2...
ConfigDict 也要从 pydantic 中导入
- 将你的响应模型设置为
List[Operation]
from typing import Listfrom schemas import Operation...@router.get("/", response_model=List[Operation])
在这种情况下，response.all() 将由 pydantic 处理并转换为序列化响应。
英文:
Adding a bit of details to @matslindh's answer:
- in your
schemas.pydefine your response model addingmodel_config
class Operation(BaseModel):model_config: ConfigDict(from_attributes=True)prop1: type1prop2: type2...
ConfigDict is imported from pydantic as well
- Set your response model to
List[Operation]
from typing import Listfrom schemas import Operation...@router.get("/", response_model=List[Operation])
In this case response.all() will be processed by pydantic and converted to serialized response
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