xml views

app/controllers/products_controller.rb

@@ -12,6 +12,10 @@ def index
   def show
   end
 
+  def products_by_category
+    @categories = Category.all
+  end
+
   # GET /products/new
   def new
     @product = Product.new

app/views/products/index.xml.builder

@@ -0,0 +1,10 @@
+xml.instruct!
+xml.products do
+  @products.each do |product|
+    xml.product do
+      xml.name product.name
+      xml.quantity product.quantity
+      xml.category product.category.name
+    end
+  end
+end

app/views/products/products_by_category.xml.builder

@@ -0,0 +1,16 @@
+#  app/views/products/products_by_category.xml.builder
+
+xml.instruct!
+xml.products_by_category do
+  @categories.each do |category|
+    xml.category do
+        xml.name category.name
+            category.products.each do |product|
+                xml.product do
+                    xml.name product.name
+                    xml.quantity product.quantity
+                end
+            end
+        end
+    end
+end

app/views/products/show.xml.builder

@@ -0,0 +1,6 @@
+xml.instruct!
+xml.product do
+  xml.name @product.name 
+  xml.quantity(@product.quantity, type: 'integer')
+  xml.category @product.category.name
+end

config/routes.rb

@@ -1,6 +1,7 @@
 Rails.application.routes.draw do
   root "products#index"
   resources :products
+  get '/products_by_category', to: 'products#products_by_category'
   resources :categories
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end