Discord Python Rewrite - Cogs 错误中的赠品命令

Question

所以，我在 cogs 中制作了赠品代码，代码是：

import discord
import datetime
import time
import asyncio
import random
import random

from discord.ext import commands
from discord import Embed

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

    @commands.command()
    async def giveaway(self, ctx, time: int, *, prize):
        giveawayembed = discord.Embed(
            title="???? New Giveaway! ????",
            colour=discord.Color.green()
            )

        giveawayembed.add_field(name="Prize", value="{}".format(prize), inline=False)
        giveawayembed.add_field(name="Hosted by", value=f"{ctx.author.mention}", inline=False)
        giveawayembed.add_field(name="Ends in", value="{}s".format(time))

        msg = await ctx.send(embed=giveawayembed)

        reactions = await msg.add_reaction("????")

        await asyncio.sleep(time)

        async for users in reactions.users(0):
            users = await reaction.users().flatten()
            winner = random.choice(users)

        endembed = discord.Embed(
            title="Giveaway ended!",
            description="Prize: {}\nWinner: {}".format(prize, winner))

        await msg.edit(embed=endembed)

    @giveaway.error
    async def giveaway_error(self, ctx, error):
        await ctx.send(error)
        print(error)
        raise error

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

但是当我尝试它时，在工作中，但获得获胜者有一些错误 错误：

discord.ext.commands.errors.CommandInvokeError：命令引发异常：AttributeError：“NoneType”对象没有“用户”属性

Answer 1

message.add_reaction 协程不返回任何内容，这意味着 reactions = await msg.add_reaction("?") 将导致 reactions 成为 None。

以下代码将刷新message 对象并覆盖msg，因为这是获取消息的新反应所必需的。

它还将检查是否选择了获胜者（以防没有人进入赠品），并将删除机器人帐户，使其无法赢得赠品。

import discord
import datetime
import time
import asyncio
import random

from discord.ext import commands
from discord import Embed

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

    @commands.command()
    async def giveaway(self, ctx, time: int, *, prize):
        giveawayembed = discord.Embed(
            title="? New Giveaway! ?",
            colour=discord.Color.green()
            )

        giveawayembed.add_field(name="Prize", value="{}".format(prize), inline=False)
        giveawayembed.add_field(name="Hosted by", value=f"{ctx.author.mention}", inline=False)
        giveawayembed.add_field(name="Ends in", value="{}s".format(time))

        msg = await ctx.send(embed=giveawayembed)

        await msg.add_reaction("?")

        await asyncio.sleep(time)

        msg = await msg.channel.fetch_message(msg.id)
        winner = None
        
        for reaction in msg.reactions:
            if reaction.emoji == "?":
                users = await reaction.users().flatten()
                users.remove(self.client.user)
                winner = random.choice(users)

        if winner is not None:
            endembed = discord.Embed(
                title="Giveaway ended!",
                description="Prize: {}\nWinner: {}".format(prize, winner))

            await msg.edit(embed=endembed)

    @giveaway.error
    async def giveaway_error(self, ctx, error):
        await ctx.send(error)
        print(error)
        raise error

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