config_when_updating

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 89
    def config_when_updating
      cookie_serializer_config_exist = File.exist?('config/initializers/cookies_serializer.rb')
      to_time_preserves_timezone_config_exist = File.exist?('config/initializers/to_time_preserves_timezone.rb')

      config

      unless cookie_serializer_config_exist
        gsub_file 'config/initializers/cookies_serializer.rb', /json/, 'marshal'
      end

      unless to_time_preserves_timezone_config_exist
        remove_file 'config/initializers/to_time_preserves_timezone.rb'
      end
    end