Upsert Using Links

[maedosan31]

I'm trying to nest several documents and linking them but I'm unable to upsert correctly.

class C3(Document):
     title: str 

class C2(Document):
     value: str
     variable: Link[C3]

class C1(Document):
    title: str
    log: Link[C2]

class MongoDB:
    @classmethod
    async def init(cls, host, database_name):
        client = AsyncIOMotorClient(host)
        await init_beanie(
            database=AsyncIOMotorDatabase(client, database_name),
            document_models=["models.C1", "models.C2", "models.C3"],
        )

@app.on_event("startup")
async def on_startup():
    await MongoDB.init(config.MONGO_URI, config.MONGO_DB_NAME)

@app.post("/tasks", response_model=C1)
async def create_task(task: C1):
    await task.save(link_rule=WriteRules.WRITE)
    return task

As I save data, it is added to all 3 tables but there is duplication always.
Is it possible to upsert in this situation for all the three documents independently ?