Update OrderDetailedSerializer

app/serializers/api/order_detailed_serializer.rb

@@ -5,8 +5,16 @@ module Api
     has_one :bill_address, serializer: Api::AddressSerializer
 
     has_many :line_items, serializer: Api::LineItemSerializer
-    has_many :adjustments, serializer: Api::AdjustmentSerializer
 
     has_many :payments, serializer: Api::PaymentSerializer
+
+    attributes :adjustments
+
+    def adjustments
+      adjustments = object.all_adjustments.where(
+        "adjustable_type IN ('Spree::Order','Spree::Shipment')"
+      ).order("label DESC")
+      ActiveModel::ArraySerializer.new(adjustments, each_serializer: Api::AdjustmentSerializer)
+    end
   end
 end

spec/controllers/api/orders_controller_spec.rb

@@ -248,7 +248,7 @@ module Api
           )
           expect(json_response[:adjustments].second).to include(
             'label' => "Shipping",
-            'amount' => order.adjustments.shipping.first.amount.to_s
+            'amount' => order.shipment_adjustments.first.amount.to_s
           )
 
           expect(json_response[:payments].first[:amount]).to eq order.payments.first.amount.to_s