rails--rails/actioncable/lib/action_cable/railtie.rb

require "rails"
require "action_cable"
require "action_cable/helpers/action_cable_helper"

module ActionCable
  class Railtie < Rails::Railtie # :nodoc:
    config.action_cable = ActiveSupport::OrderedOptions.new
    config.eager_load_namespaces << ActionCable

    initializer "action_cable.helpers" do
      ActiveSupport.on_load(:action_view) do
        include ActionCable::Helpers::ActionCableHelper
      end
    end

    initializer "action_cable.logger" do
      ActiveSupport.on_load(:action_cable) { self.logger ||= ::Rails.logger }
    end

    initializer "action_cable.set_configs" do |app|
      options = app.config.action_cable

      options.allowed_request_origins ||= "http://localhost:3000" if ::Rails.env.development?

      ActiveSupport.on_load(:action_cable) do
        options.each { |k,v| send("#{k}=", v) }
      end
    end
  end
end