[api] Ensure total_quantity and display_item_total are available on o…

…rders/index and orders/show

api/app/views/spree/api/orders/index.v1.rabl

@@ -1,6 +1,6 @@
 object false
 child(@orders => :orders) do
- attributes *order_attributes
+ extends "spree/api/orders/order"
 end
 node(:count) { @orders.count }
 node(:current_page) { params[:page] || 1 }

api/app/views/spree/api/orders/order.v1.rabl

@@ -0,0 +1,3 @@
+attributes *order_attributes
+node(:display_item_total) { |o| o.display_item_total.to_s }
+node(:total_quantity) { |o| o.line_items.sum(:quantity) }

api/app/views/spree/api/orders/show.v1.rabl

@@ -1,6 +1,5 @@
 object @order
-attributes *order_attributes
-node(:display_item_total) { |o| o.display_item_total.to_s }
+extends "spree/api/orders/order"
 
 if lookup_context.find_all("spree/api/orders/#{@order.state}").present?
  extends "spree/api/orders/#{@order.state}"

api/spec/controllers/spree/api/orders_controller_spec.rb

@@ -9,7 +9,8 @@ module Spree
  :state, :adjustment_total,
  :user_id, :created_at, :updated_at,
  :completed_at, :payment_total, :shipment_state,
- :payment_state, :email, :special_instructions] }
+ :payment_state, :email, :special_instructions,
+ :total_quantity, :display_item_total] }
 
 
  before do