Discord.py 无法定义通道 [已修复]

Question

I'm making a discord bot that sends a welcome message to a specified channel in the.jason file. So it could be compatible with multiple servers. But it runs into an error and I can't figure out how to fix it.

@client.command()
@commands.has_permissions(administrator=True)
async def welcomeMessage(ctx):
    with open("guild.json", "r") as f:
        guildInfo = json.load(f)

    guildInfo[ctx.message.guild.id] = ctx.message.channel.id #sets the channel it was sent to as the default welcome message channel

    with open("guild.json", "w") as f:
        json.dump(guildInfo, f)


@client.event
async def on_member_join(member):
    with open("guild.json", "r") as f:
        guildInfo = json.load(f)

    channel = guildInfo[ctx.message.guild.id] #this keeps causing the error
    
    embed = discord.Embed(colour=0x07faf6, description=f"***Welcome to the Server***")
    embed.set_thumbnail(url=f"{member.avatar_url}")
    embed.set_author(name=f"{member.name}", icon_url=f"{member.avatar_url}")
    embed.set_footer(text=f"{member.guild}", icon_url=f"{member.guild.icon_url}")
    embed.timestamp = datetime.datetime.utcnow()
    await channel.send(embed=embed)

I have got everything working except this:

channel = guildInfo[ctx.message.guild.id]

It keeps giving me this error:

    channel = guildInfo[ctx.message.guild.id]
AttributeError: module 'ctx' has no attribute 'message'

EDIT: I redid the code and now it works.

here it is:

@client.command(pass_context=True)
@commands.has_permissions(administrator=True)
async def welcomechannel(ctx):
    fileopen = str(ctx.message.guild.id) + ".json"
    file = open(fileopen, "w")
    data = {}
    data["channel"] = ctx.message.channel.id
    json.dump(data, file)
    print("The channel has been added to the list")

@client.event
async def on_member_join(member):
    colours = [0x3348FF, 0x000000, 0xFFFFFF]
    try:
        fileopen = str(member.guild.id) + ".json"
        file = open(fileopen, "r")
        data = json.load(file)

        channelid = data["channel"]
        channel = client.get_channel(id=channelid)

    
        embed = discord.Embed(colour=random.choice(colours), description="***Welcome***")
        embed.set_thumbnail(url=f"{member.avatar_url}")
        embed.set_author(name=f"{member.name}", icon_url=f"{member.avatar_url}")
        embed.set_footer(text=f"{member.guild}", icon_url=f"{member.guild.icon_url}")
        embed.timestamp = datetime.datetime.utcnow()
        
        await channel.send(embed=embed)

    except:
        print("The server doesn't have a welcome channel")

Answer 1

The on_member_join event does not provide a context. Luckily, the member passed to the on_member_join event has a guild attribute capturing the guild the member belongs to (or in this case, joined). Replace your ctx.message.guild.id by member.guild.id and you should be good