报错
in await_only raise exc.MissingGreenlet( sqlalchemy.exc.MissingGreenlet: greenlet_spawn has not been called; can't call await_only() here. Was IO attempted in an unexpected place? (Background on this error at: https://sqlalche.me/e/20/xd2s)
解决方案
https://stackoverflow.com/questions/68195361/how-to-properly-handle-many-to-many-in-async-sqlalchemy
import sqlalchemy as sa from sqlalchemy.ext.asyncio import AsyncSession from sqlalchemy.orm import selectinload from . import models async def get_parent_prefetch_children(db: AsyncSession, parent_id: int) -> models.Parent: result = await db.execute( sa.select(models.Parent).where(models.Parent.id == parent_id).options( selectinload(models.Parent.children) ) ) return result.scalar()
标签:
sqlalchemy
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2022-02-20 javascript Promise