Rename ShoppingCart::Item::InstanceMethods module

to ShoppingCart::Item

lib/active_record/acts/shopping_cart.rb

@@ -18,7 +18,7 @@ module ClassMethods
         #
         def acts_as_shopping_cart_using(item_class)
           self.send :include, ActiveRecord::Acts::ShoppingCart::Collection
-          self.send :include, ActiveRecord::Acts::ShoppingCart::Item::InstanceMethods
+          self.send :include, ActiveRecord::Acts::ShoppingCart::Item
           has_many :shopping_cart_items, :class_name => item_class.to_s.classify,
               :as => :owner, :dependent => :destroy
         end

lib/active_record/acts/shopping_cart/item.rb

@@ -0,0 +1,56 @@
+module ActiveRecord
+  module Acts
+    module ShoppingCart
+      module Item
+
+        #
+        # Returns the cart item for the specified object
+        #
+        def item_for(object)
+          shopping_cart_items.where(:item_id => object.id, :item_type => object.class.name).first
+        end
+
+        #
+        # Returns the subtotal of a specified item by multiplying the quantity times
+        # the price of the item.
+        #
+        def subtotal_for(object)
+          item = item_for(object)
+          item ? item.subtotal : 0
+        end
+
+        #
+        # Returns the quantity of the specified object
+        #
+        def quantity_for(object)
+          item = item_for(object)
+          item ? item.quantity : 0
+        end
+
+        #
+        # Updates the quantity of the specified object
+        #
+        def update_quantity_for(object, new_quantity)
+          item = item_for(object)
+          item.update_quantity(new_quantity) if item
+        end
+
+        #
+        # Returns the price of the specified object
+        #
+        def price_for(object)
+          item = item_for(object)
+          item ? item.price : 0
+        end
+
+        #
+        # Updates the price of the specified object
+        #
+        def update_price_for(object, new_price)
+          item = item_for(object)
+          item.update_price(new_price) if item
+        end
+      end
+    end
+  end
+end

lib/acts_as_shopping_cart.rb

@@ -6,11 +6,8 @@
 module ActiveRecord
   module Acts
     module ShoppingCart
-      autoload :Collection, 'active_record/acts/shopping_cart/collection'
-
-      module Item
-        autoload :InstanceMethods, 'active_record/acts/shopping_cart/item/instance_methods'
-      end
+      autoload :Collection , 'active_record/acts/shopping_cart/collection'
+      autoload :Item       , 'active_record/acts/shopping_cart/item'
     end
 
     module ShoppingCartItem

spec/active_record/acts/shopping_cart/item/instance_methods_spec.rb → spec/active_record/acts/shopping_cart/item_spec.rb

@@ -1,9 +1,9 @@
-require File.expand_path(File.dirname(__FILE__) + '../../../../../spec_helper')
+require File.expand_path(File.dirname(__FILE__) + '../../../../spec_helper')
 
-describe ActiveRecord::Acts::ShoppingCart::Item::InstanceMethods do
+describe ActiveRecord::Acts::ShoppingCart::Item do
   let(:klass) do
     klass = Class.new
-    klass.send :include, ActiveRecord::Acts::ShoppingCart::Item::InstanceMethods
+    klass.send :include, ActiveRecord::Acts::ShoppingCart::Item
     klass
   end