FastAPI部署在Heroku上，连接到MongoDB时内部服务器出错

Question

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我想将database与我的mongodb数据库连接起来，当我在本地主机上运行我的后端时，它可以正常工作。但是当我在heroku上部署这段代码并尝试方法时，它返回“内部服务器错误”。我再次检查发现put、post和delete方法在某种程度上是有效的，我的意思是它在数据库上创建和更新数据，但同时给出内部服务器错误。所以我无法从数据库中读取数据，只能创建、更新和删除。

db.py

    from model import *
    import motor.motor_asyncio
    
    DATABASE_URI = "mongodb+srv://mongodb_url"
    client = motor.motor_asyncio.AsyncIOMotorClient(DATABASE_URI)
    database = client.todoList
    collection = database.todo


async def fetch_one_todo(nanoid):
    document = await collection.find_one({"nanoid": nanoid})
    return document


async def fetch_all_todos():
    todos = []
    cursor = collection.find({})
    async for document in cursor:
        todos.append(ToDo(**document))
    return todos


async def create_todo(todo):
    document = todo
    await collection.insert_one(document)
    return document


async def update_todo(nanoid, data):
    await collection.update_one({"nanoid": nanoid}, {"$set": data})
    document = await collection.find_one({"nanoid": nanoid})
    return document


async def remove_todo(nanoid):
    await collection.delete_one({"nanoid": nanoid})
    return True

main.py

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from db import *
from model import ToDo
from UpdateModel import UpdateToDo


app = FastAPI()

origins = ["*"]
app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.get("/")
async def read_root():
    return {"Hi!"}


@app.get("/api/get-todo")
async def get_todo():
    response = await fetch_all_todos()
    return response


@app.get("/api/get-todo/{nanoid}", response_model=ToDo)
async def get_todo_id(nanoid):
    todo = await fetch_one_todo(nanoid)
    if todo:
        return todo
    raise HTTPException(404)


@app.post("/api/add-todo", response_model=ToDo)
async def post_todo(todo: ToDo):
    response = await create_todo(todo.dict())
    if response:
        return response
    raise HTTPException(400, "Something went wrong")


@app.put("/api/update-todo/{nanoid}", response_model=ToDo)
async def put_todo(nanoid: str, updatetodo: UpdateToDo):
    response = await update_todo(nanoid, updatetodo.dict())
    if response:
        return response
    raise HTTPException(404, 'wrong')


@app.delete("/api/delete-todo/{nanoid}")
async def delete_todo(nanoid):
    response = await remove_todo(nanoid)
    if response:
        return response
    raise HTTPException(404)

Answer 1

问题在于MongoDB驱动程序，更新修复了问题。