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module ActionCable
  module Channel
    module Naming
      extend ActiveSupport::Concern

      class_methods do
        # Returns the name of the channel, underscored, without the <tt>Channel</tt> 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'
        def channel_name
          @channel_name ||= name.sub(/Channel$/, '').gsub('::',':').underscore
        end
      end

      # Delegates to the class' <tt>channel_name</tt>
      delegate :channel_name, to: :class
    end
  end
end