# File actioncable/lib/action_cable/channel/naming.rb, line 16
def channel_name
  @channel_name ||= name.delete_suffix("Channel").gsub("::", ":").underscore
end

Returns the name of the channel, underscored, without the Channel ending. If the channel is in a namespace, then the namespaces are represented by single colon separators in the channel name.

ChatChannel.channel_name # => 'chat'
Chats::AppearancesChannel.channel_name # => 'chats:appearances'
FooChats::BarAppearancesChannel.channel_name # => 'foo_chats:bar_appearances'