Command.ext decorators not responding in subclass

Ciwonie

August 13, 2021 16:32
Edited

I'm building a class for my bot and I'm having trouble with the discord.py command extension. I cannot receive a response when I attempt to trigger a function decorated by the command extension. Here are some snippets:

**main.py**


client = bot_class.PersonalBot()
client.run(DISCORD_TOKEN, bot=True, reconnect=True)

## **bot_class.py**

import discord
from discord.ext import commands

bot = commands.Bot(command_prefix="!")

class PersonalBot(discord.Client):

   # First Event: when discord bot is ready
   async def on_ready(self):
      await is_alive(self)

   #################################################
   @bot.command()                                ###
   async def hello(self, ctx):                   ### <----- cannot trigger
      await ctx.channel.send("Hello i am bot")      ###
   #################################################

   # Second Event: Natural Language Processor
   async def on_message(self, message):

      if message.author == self.user:
         return

      msg = message.content.lower()

      if msg.startswith("$responding"):
         await toggle_bot(message, msg)

The on_ready() and on_message() functions work as intended--they're not decorated. I can see when my bot is live and I can type "$responding" in a text channel to trigger that event. But I cannot induce the hello function that is decorated by the command extension.

Comments

1 comment

cereales

October 17, 2023 17:30

Edited
Hello,
I ran into the same issue, an nobody seems to answer to this on the net.
Even if this post is more than 2 years old, let me share what I learned for people who will fall into this page.
As suggested by the owner of discord.py API, you should use Cogs.

Explanations
There are two different ways to declare discord bot.
1. Using an instance of commands.Bot and bot.command() decorator on top of methods declared in the main script.
2. Creating a subclass of commands.Bot and override methods.
But the second way seems not able to support custom commands as the self or bot object does not exist. And the commands.command() decorator does not work.
As suggested in discord.py issues, you should use Cogs. Here is the example I am using. I am not sure this is the best way to do, but it works as expected.
```
import discord
from discord.ext import commands


class PersonalBot(commands.Bot):
    def __init__(self):
        intents = discord.Intents.all()     # Giving all permissions for the example
        super().__init__(command_prefix="!", intents=intents)

    # First Event: when discord bot is ready
    async def on_ready(self):
        await self.add_cog(CommandGroup(self)) # Register 1 group (Cog) of commands

    #################################################
    async def hello(self, ctx):                    ## <----- cannot trigger
        await ctx.channel.send("Hello i am bot")   ##
    #################################################

    # Second Event: Natural Language Processor
    async def on_message(self, message):
        await super().on_message(message)   # Forward event to Bot, not to block commands detection, etc
        # Do things...


class CommandGroup(commands.Cog, name="group1"):
    @commands.command(name="hello")
    async def hello(self, ctx):
        await ctx.send("Hello I am a bot.")


client = PersonalBot()
client.run(DISCORD_TOKEN, reconnect=True)
```
Useful Links:
- discord.py issue #5153 : https://github.com/Rapptz/discord.py/issues/5153
- discord.py issue #2031 : https://github.com/Rapptz/discord.py/issues/2031#issuecomment-478205413
- How to use Cogs : https://discordpy.readthedocs.io/en/latest/ext/commands/cogs.html
- API Reference - Cogs documentation : https://discordpy.readthedocs.io/en/latest/ext/commands/api.html#cogs
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Explanations

Useful Links: