import asyncio
import os

from beanie import Document, init_beanie
from motor.motor_asyncio import AsyncIOMotorClient


class Parent(Document):
    name: str

    class Settings:
        name = "parents"
        use_revision = True
        keep_nulls = False


async def main():
    client = AsyncIOMotorClient(os.environ["MONGO_URI"])
    await init_beanie(database=client.test, document_models=[Parent])

    # raises OperationFailure
    parent = Parent(name="P1")
    await parent.save()

    # works
    parent = Parent(name="P2")
    await parent.insert()


if __name__ == "__main__":
    asyncio.run(main())