user can place order

app/commands/shopping_cart/place_order.rb

@@ -0,0 +1,27 @@
+module ShoppingCart
+  class PlaceOrder < Rectify::Command
+    def initialize(order, params)
+      @order = order
+      @params = params
+    end
+
+    def call
+      place_order if order_valid?
+    end
+
+    private
+
+    def order_valid?
+      nested_models.all? { |model| @order.public_send(model).valid? }
+    end
+
+    def nested_models
+      [:shipping, :billing, :credit_card, :delivery]
+    end
+
+    def place_order
+      @order.completed
+      @order.save
+    end
+  end
+end

app/views/shopping_cart/checkout/_completed_buttons.html.haml

@@ -0,0 +1,4 @@
+.raw
+  .col-md-12.text-left
+    = f.hidden_field :id
+    = back_to_shop_link

app/views/shopping_cart/checkout/_final_step.html.haml

@@ -0,0 +1,7 @@
+= render partial: 'ckeckout_header', locals: {step: @step}
+%main.raw
+  = render partial: 'errors_messages', locals: {order: @order}
+  = form_for @order, url: wizard_path do |f|
+    = render partial: 'confirmation_details', locals: {order: @order, step: @step}
+    = render partial: 'confirmation_order', locals: {order: @order}
+    = render partial: template, locals: {f: f, order: @order}

app/views/shopping_cart/checkout/complete.html.haml

@@ -0,0 +1 @@
+= render partial: 'final_step', locals: {template: 'completed_buttons'}

app/views/shopping_cart/checkout/confirm.html.haml

@@ -1,7 +1 @@
-= render partial: 'ckeckout_header', locals: {step: @step}
-%main.raw
-  = render partial: 'errors_messages', locals: {order: @order}
-  = form_for @order, url: wizard_path do |f|
-    = render partial: 'confirmation_details', locals: {order: @order, step: @step}
-    = render partial: 'confirmation_order', locals: {order: @order}
-    = render partial: 'confirmation_buttons', locals: {f: f, order: @order}
+= render partial: 'final_step', locals: {template: 'confirmation_buttons'}