Is subtype the right event field to inspect?

[reillysiemens]

As it turns out, when a user joins a group multiple events are fired. There's a simple event:

{'channel': 'G1A8FU8AF',
 'channel_type': 'G',
 'event_ts': '1510652911.000174',
 'inviter': 'U03QJJHES',
 'ts': '1510652911.000174',
 'type': 'member_joined_channel',
 'user': 'U03YZLA0F'}

and a more complex event that fires later:

[{'channel': 'G1A8FU8AF',
  'event_ts': '1510652911.000182',
  'inviter': 'U03QJJHES',
  'subtype': 'group_join',
  'team': 'T03ZKJJPR',
  'text': '<@U03YZLA0F> has joined the group',
  'ts': '1510652911.000182',
  'type': 'message',
  'user': 'U03YZLA0F',
  'user_profile': {'avatar_hash': 'fe4afee620eb',
   'display_name': 'someuser',
   'first_name': 'Some',
   'image_72': 'https://avatars.slack-edge.com/2016-12-19/119019590852_fe4afee620dzff3d6cbe_72.png',
   'is_restricted': False,
   'is_ultra_restricted': False,
   'name': 'someuser',
   'real_name': 'Some User',
   'team': 'T03ZKJJPR'}}]

Should the bot actually match the first event rather than looking at subtypes of the message event? My gut says yes, but I haven't identified whether this is that same for a member_joined_group event? Does such a thing exist? Would there be missing context we could gain from the message event? I'm guessing nothing we couldn't get if we just did a lookup on the user from the first type of event. 🤔

[reillysiemens]

There's no member_joined_group event. Both private and public channels are encompassed by the member_joined_channel event which, it would appear, is the right thing to do. Further documentation on that event can be found here.