Error while making a bot join my voice channel. 'Interaction' object has no attribute 'voice_state'

[hitblast]

I'm trying to lay the foundation of a music system inside my Discord bot that I will be developing on for quite some time in the future. I finished up most of the basic work, except that one error popped in:

Command 'join' raised an exception: 'Interaction' object has no attribute 'voice_state'

If you want more context, here's the code inside the Music cog I'm currently working on:
View original project instead

class Music(commands.Cog):
    def __init__(
        self,
        bot: core.IgKnite
    ) -> None:
        self.bot = bot
        self.voice_states = {}

    def get_voice_state(
        self,
        inter: discord.Interaction
    ) -> VoiceState:
        state = self.voice_states.get(inter.guild.id)

        if not state or not state.exists:
            state = VoiceState(self.bot, inter)
            self.voice_states[inter.guild.id] = state

        return state

    def cog_unload(self) -> None:
        for state in self.voice_states.values():
            self.bot.loop.create_task(state.stop())

    def ensure_voice_state(func):
        @functools.wraps(func)
        async def callback(
            self,
            inter: discord.Interaction,
            *args,
            **kwargs
        ) -> None:
            inter.voice_state = self.get_voice_state(inter)
            await func(self, inter, *args, **kwargs)

        return callback

    @app_commands.command(
        name='join',
        description='Joins the voice channel that you\'re in.',
    )
    @app_commands.guild_only()
    @ensure_voice_state
    async def _join(
        self,
        inter: discord.Interaction
    ) -> None:
        destination = inter.user.voice.channel

        if inter.voice_state.voice:
            await inter.voice_state.voice.move_to(destination)
        else:
            inter.voice_state.voice = await destination.connect()

If you have a look at the ensure_voice_state decorator, it basically 'ensures', as the name suggests, the voice state of a server and adds it as an attribute of the inter or the discord.Interaction instance of the slash command (see the join method). However, when I try to run the command, it throws me an error as written below. Thoughts?

[LostLuma]

You can not add arbitrary attributes to most of the libraries' models, including Interaction.

Since this is a common request when it comes to interactions there is Interaction.extras, a dictionary that you may store any of your own state in, meaning you can simply replace your assignment and uses:

-            inter.voice_state = self.get_voice_state(inter)
+            inter.extras['voice_state'] = self.get_voice_state(inter)

[hitblast]

Works now 👍