cannot handle NotOwner error from cog_check

[aurkaxi]

my error handling:

   @commands.Cog.listener()
    async def on_command_error(self, ctx, error):
        if isinstance(error, commands.NotOwner):
            await ctx.send(f"Not owner.")
        elif isinstance(error, commands.CheckFailure):
            await ctx.send(f"Check failure.")

my cog check:

class adminusage(commands.Cog, name="Admin Usage"):
    def __init__(self, bot):
        self.bot = bot

    async def cog_check(self, ctx):
        return await self.bot.is_owner(ctx.author)

so when the check fails it sends does the job for CheckFailure. But it should send NotOwner.

(CheckFailure always denies to work with me :( is this because i am ugly?)

[LostLuma]

Hello, this is because the is_owner method only returns a bool, rather than an exception like the built in is_owner check.

You can modify your cog_check to instead of simply returning a bool, which will make the library raise CheckFailure, raise the NotOwner error yourself to handle it elsewhere.

[Soheab]

You can also manually call the decorator with the following:

ret = await commands.is_owner().predicate(ctx)

that will return a bool or raise commands.NotOwner like normal.

Do be aware that the above method is not documented or recommended anywhere.

[aurkaxi]

thanks @Soheab ! that is exactly i was looking for hours. I didn't want to raise my own error for something builtin.