load_defaults

# File railties/lib/rails/application/configuration.rb, line 57
      def load_defaults(target_version)
        case target_version.to_s
        when "5.0"
          if respond_to?(:action_controller)
            action_controller.per_form_csrf_tokens = true
            action_controller.forgery_protection_origin_check = true
          end

          ActiveSupport.to_time_preserves_timezone = true

          if respond_to?(:active_record)
            active_record.belongs_to_required_by_default = true
          end

          self.ssl_options = { hsts: { subdomains: true } }

        when "5.1"
          load_defaults "5.0"

          if respond_to?(:assets)
            assets.unknown_asset_fallback = false
          end

        else
          raise "Unknown version #{target_version.to_s.inspect}"
        end
      end