Fix issue with nil current_order where shipping_method serializer requires a current_order to calculate the shipping fees

app/controllers/api/orders_controller.rb

@@ -2,7 +2,7 @@ module Api
   class OrdersController < BaseController
     def show
       authorize! :read, order
-      render json: order, serializer: Api::OrderDetailedSerializer
+      render json: order, serializer: Api::OrderDetailedSerializer, current_order: order
     end
 
     def index

spec/controllers/api/orders_controller_spec.rb

@@ -218,8 +218,16 @@ module Api
           expect_order
         end
 
+        it "can view an order with weight calculator (this validates case where options[current_order] is nil on the shipping method serializer)" do
+          order.shipping_method.update_attribute(:calculator, create(:weight_calculator, calculable: order))
+          allow(controller).to receive(:current_order).and_return order
+          get :show, id: order.number
+          expect_order
+        end
+
         it "returns an order with all required fields" do
           get :show, id: order.number
+
           expect_order
           expect(json_response.symbolize_keys.keys).to include(*order_detailed_attributes)