config_when_updating

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 91
    def config_when_updating
      cookie_serializer_config_exist = File.exist?('config/initializers/cookies_serializer.rb')
      action_cable_config_exist = File.exist?('config/cable.yml')
      rack_cors_config_exist = File.exist?('config/initializers/cors.rb')

      config

      gsub_file 'config/environments/development.rb', /^(\s+)config\.file_watcher/, '\1# config.file_watcher'

      unless cookie_serializer_config_exist
        gsub_file 'config/initializers/cookies_serializer.rb', /json(?!,)/, 'marshal'
      end

      unless action_cable_config_exist
        template 'config/cable.yml'
      end

      unless rack_cors_config_exist
        remove_file 'config/initializers/cors.rb'
      end
    end