many changes

app/decorators/product_decorator.rb

@@ -0,0 +1,40 @@
+class ProductDecorator < Draper::Base
+  decorates :product
+
+  def category_links(options = {})
+    if namespace = options[:namespace]
+      product_categories.map{|pc| h.link_to pc.name, [namespace, pc]}.join(', ').html_safe
+    else
+      product_categories.map{|pc| h.link_to pc.name, pc}.join(', ').html_safe
+    end
+  end
+
+  # Accessing Helpers
+  #   You can access any helper via a proxy
+  #
+  #   Normal Usage: helpers.number_to_currency(2)
+  #   Abbreviated : h.number_to_currency(2)
+  #
+  #   Or, optionally enable "lazy helpers" by including this module:
+  #     include Draper::LazyHelpers
+  #   Then use the helpers with no proxy:
+  #     number_to_currency(2)
+
+  # Defining an Interface
+  #   Control access to the wrapped subject's methods using one of the following:
+  #
+  #   To allow only the listed methods (whitelist):
+  #     allows :method1, :method2
+  #
+  #   To allow everything except the listed methods (blacklist):
+  #     denies :method1, :method2
+
+  # Presentation Methods
+  #   Define your own instance methods, even overriding accessors
+  #   generated by ActiveRecord:
+  #
+  #   def created_at
+  #     h.content_tag :span, attributes["created_at"].strftime("%a %m/%d/%y"),
+  #                   :class => 'timestamp'
+  #   end
+end