AttributeError: _member_count in Guild

[ioistired]

Summary

Guild._member_count is sometimes unset

Reproduction Steps

I'm summing my guilds' member count in on_shard_ready. My bot got disconnected from the internet, and after I got a new DHCP lease, I got this exception

Minimal Reproducible Code

# the actual code i'm using saves this to a database but this is easier to test
async def on_shard_ready(self, shard_id):
    member_count = sum(guild.member_count for guild in self.guilds if guild.shard_id == shard_id)
    print(f'Member count for shard {shard_id}: {member_count}')

Expected Results

Member count is printed after a reconnect

Actual Results

Ignoring exception in on_shard_ready
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "bot.py", line 74, in on_shard_ready
    member_count = sum(guild.member_count for guild in guilds)
  File "bot.py", line 74, in <genexpr>
    member_count = sum(guild.member_count for guild in guilds)
  File "/usr/local/lib/python3.8/site-packages/discord/guild.py", line 741, in member_count
    return self._member_count
AttributeError: _member_count

Intents

guilds, messages, guild_reactions, emojis

System Information

• Python v3.8.9-final
• discord.py v1.6.0-final
• aiohttp v3.6.2
• system info: Linux 4.19.0-14-amd64 Fix issue with author changing type #1 SMP Debian 4.19.171-2 (2021-01-30)

Checklist

I have searched the open issues for duplicates.
I have shown the entire traceback, if possible.
I have removed my token from display, if visible.

I'm not sure if the reconnect is related to this issue, but I haven't gotten it on a "cold' boot. Apparently this is supposed to be fixed by 9f47d7f.

[apple502j]

Are you sure the guild is not unavailable? Most of the attributes cannot be accessed for unavailable guilds.

[Rapptz]

on_shard_ready is called when a specific shard is ready, however the remaining shard guilds are still loading. The other guilds are still in the Bot.guilds mapping so there's a chance they're not fully available when you access them and the library is waiting for the GUILD_CREATE stream.

[ioistired]

The code I'm using only looks at guilds in the current shard. Here's a bit more context for that traceback:

		guilds = [guild for guild in self.guilds if guild.shard_id == shard_id]
		guild_count = len(guilds)
		member_count = sum(guild.member_count for guild in guilds)