使用 MongoDB 自定义前缀命令

Question

我正在尝试创建一个setprefix 命令，它会更改服务器前缀。但是，我收到以下错误：

    raise TypeError("command_prefix must be plain string, iterable of strings, or callable "
TypeError: command_prefix must be plain string, iterable of strings, or callable returning either of these, not coroutine

我的代码：

main.py

#------importing packages

import keep_alive
import os
import discord
from discord.ext import commands
import pymongo
from pymongo import MongoClient
import asyncio
import motor
import motor.motor_asyncio
import prefixes
from prefixes import Prefixes

### MongoDB Variables ###
mongo_url = os.environ['Mongodb_url']
cluster = motor.motor_asyncio.AsyncIOMotorClient(str(mongo_url))
db = cluster['Database']
collection = db['prefixes']


bot = commands.Bot(command_prefix = Prefixes.setprefix(), case_insensitive=True)

bot.remove_command('help')
my_token = os.environ['Token']

#------When bot is online


@bot.event
async def on_ready():

    #status
    #playing game status

    await bot.change_presence(activity=discord.Game(
        name=f'On {len(bot.guilds)} Servers | -help'))

    print('Bot is Ready')


initial_extensions = ['help', 'math1', 'mod', 'anime', 'prefixes']

if __name__ == '__main__':
    for extension in initial_extensions:
        bot.load_extension(extension)


#ping latency....
@bot.command()
async def ping(ctx):
    await ctx.send(f'Pong\n{round(bot.latency * 1000)}ms')




#------Running the bot
keep_alive.keep_alive()
bot.run(my_token)

为 cog 文件添加前缀

import discord
from discord.ext import commands
import asyncio
import motor
import motor.motor_asyncio
import os


class Prefixes(commands.Cog):
    def __init__(self, bot):
        self.bot = bot


    #custom prefix
    @commands.command()
    @commands.has_permissions(administrator = True)
    async def setprefix(self, ctx, prefix):

        ### MongoDB Variables ###
        mongo_url = os.environ['Mongodb_url']
        cluster = motor.motor_asyncio.AsyncIOMotorClient(str(mongo_url))
        db = cluster['Database']
        collection = db['prefixes']

        guild_id = ctx.guild.id
        server_prefix = prefix

        if (await collection.count_documents({})) == 0:

            prefix_info = {'GuildId': guild_id, 'Prefix': server_prefix}
            await collection.insert_one(prefix_info)

        else:
            prefix_info = {'GuildId': guild_id, 'Prefix': server_prefix}
            await collection.update_one({'GuildId': guild_id}, {'$set': {'Prefix': prefix}})

        await ctx.send(f'My prefix is now {prefix}')

        finding_prefix = await collection.find_one({'Prefix': {'$eq': prefix}})

        view_finding_prefix = finding_prefix.values()
        iterate_view = iter(view_finding_prefix)
        first_value = next(iterate_view)

        self.bot(command_prefix = str(first_value), case_insesitive = True)



def setup(bot):
    bot.add_cog(Prefixes(bot))

我不明白为什么会有TypeError。我正在使用motor，因为它支持异步。在motor documentation 中，它说当使用find_one() 它作为字典给出。这就是我这样做的原因，正如您在上面的代码中看到的那样：

        finding_prefix = await collection.find_one({'Prefix': {'$eq': prefix}})

        view_finding_prefix = finding_prefix.values()
        iterate_view = iter(view_finding_prefix)
        first_value = next(iterate_view)

        self.bot(command_prefix = str(first_value), case_insesitive = True)

我这样做是为了获得键 Prefix 的第一个值。如果有其他人可以这样做，请告诉我。

Answer 1

如果你理解逻辑，这很简单，首先代码 虽然

import os

import discord
import motor.motor_asyncio
import nest_asyncio
from discord.ext import commands
from discord.ext.commands import BucketType, cooldown
from pymongo import MongoClient

nest_asyncio.apply()

mongo_url = os.environ.get("MONGO_URL")

cluster = motor.motor_asyncio.AsyncIOMotorClient(mongo_url)

predb = cluster["discord"]["prefix"]


class Prefix(commands.Cog):
    def __init__(self, client):
        self.client = client

    @commands.Cog.listener()
    async def on_ready(self):
        print("Prefix cog loaded successfully")

    @commands.command(
        cooldown_after_parsing=True, description="Changes Bot prefix for this server"
    )
    @cooldown(1, 10, BucketType.user)
    @commands.has_permissions(administrator=True)
    async def setprefix(self, ctx, new_prefix):
        if len(new_prefix) > 3:
            embed = discord.Embed(
                timestamp=ctx.message.created_at,
                title="Error",
                description="Looks like the prefix is very big ",
                color=0xFF0000,
            )
            await ctx.send(embed=embed)
        else:

            new_prefix = str(new_prefix)
            stats = await predb.find_one({"guild": ctx.guild.id})

            if stats is None:
                updated = {"guild": ctx.guild.id, "prefix": new_prefix}
                await predb.insert_one(updated)
                embed = discord.Embed(
                    title="Prefix",
                    description=f"This server prefix is now {new_prefix}",
                    color=0xFF0000,
                )
                await ctx.send(embed=embed)

            else:
                await predb.update_one(
                    {"guild": ctx.guild.id}, {"$set": {"prefix": new_prefix}}
                )

                embed = discord.Embed(
                    timestamp=ctx.message.created_at,
                    title="Prefix",
                    description=f"This server prefix is now {new_prefix}",
                    color=0xFF0000,
                )
                await ctx.send(embed=embed)


def setup(client):
    client.add_cog(Prefix(client))

它的作用和工作原理是什么？

1. 首先检查前缀是否太长，因为没有人希望人们搞砸并忘记了长前缀发生的前缀，如果你不想要它可以删除它 如果服务器已经注册，则在第一个 else 条件下，即如果在更新之前更改了前缀，否则会创建一个新条目，希望这会有所帮助，如果它对您有用并且您很高兴，请将此标记为答案:)

Answer 2

我认为您需要一个数据库来制作自定义前缀代码，因为您需要为机器人所在的每个服务器自定义前缀。