“FastAPI SQLAlchemy 无法将字典更新序列元素 #0 转换为序列”

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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:

  1. 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: type1
  prop2: type2
  ...

ConfigDict 也要从 pydantic 中导入

  1. 将你的响应模型设置为 List[Operation]
from typing import List
from 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:

  1. in your schemas.py define your response model adding model_config
class Operation(BaseModel):
  model_config: ConfigDict(from_attributes=True)

  prop1: type1
  prop2: type2
  ...

ConfigDict is imported from pydantic as well

  1. Set your response model to List[Operation]
from typing import List
from schemas import Operation
...
@router.get("/", response_model=List[Operation])

In this case response.all() will be processed by pydantic and converted to serialized response

huangapple
  • 本文由 发表于 2023年5月24日 18:05:12
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