import pymongo

conn = pymongo.MongoClient("mongodb://localhost:27017/")
userID = 21312313
if conn.mydb.mycol.count_documents({ 'userID': userID }):
    print("**Error: You're already in the database**")
else:
    print("**Adding new inventory to the database**")
    mydict = { "userID": userID, "coin": "0", "inv": {"inv1": "", "inv2": "", "inv3": "", "inv4": "", "inv5": ""} }
    y = conn.mydb.mycol.insert_one(mydict)

在普通 python 中运行这是有效的.

Running in normal python this works.

这是因为您将 MongoDB 连接定义为 conn，db 称为 mydb，集合称为 mycol.

This is because you define the MongoDB connection as conn, the db is called mydb and the collection is called mycol.

MongoDB 的结构如下:Connection ->数据库 ->集合 ->文档 ->键/值

MongoDB's structure looks like: Connection -> Database -> Collection -> Document -> Key/Value

您的解决方案是:

import pymongo

conn = pymongo.MongoClient("mongodb://localhost:27017/")
userID = ctx.message.author.id
if conn.mydb.mycol.count_documents({ 'userID': userID }):
    await ctx.send("**Error: You're already in the database**")
else:
    await ctx.send("**Adding new inventory to the database**")
    mydict = { "userID": userID, "coin": "0", "inv": {"inv1": "", "inv2": "", "inv3": "", "inv4": "", "inv5": ""} }
    y = conn.mydb.mycol.insert_one(mydict)