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You should only call init_beanie once, and the other connections use from the same connection pool.

I also had some issue and had to figure this out on my own. Cheers!

from fastapi import FastAPI
from beanie import init_beanie
from motor.motor_asyncio import AsyncIOMotorClient

config = dotenv_values(".env")

conn_str = config['MONGO_URI'] # change this to the MONGO-DB connection string
database_name = config['DB_NAME'] # change this to the MONGO-DB database name

@asynccontextmanager
async def lifespan(app: FastAPI):
    app.db = AsyncIOMotorClient(conn_str).get_database(database_name)
    # ensure to add all the Models created to the `documents_models` list below
    await init_beanie(app.db, document_models=[
        Customer, CustomerID, CustomerUpdate,
        Car, CarID, CarUpdate,
        Order,
    ]) # add the Models to the DB
    # models are the database repr you created using beanie. They must all be added inside the documents-models array.

    print("DB connection successful...")
    yield
    print("!! Shutdown complete !!")

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