add namespaced models

spec/models.rb

@@ -21,6 +21,24 @@ class Store < ActiveRecord::Base
   has_many :products
 end
 
+module Inventory
+end
+
+class Inventory::ProductFeature < ActiveRecord::Base
+  actable
+  validates_presence_of :name, :price
+
+  def present
+    "#{name} - $#{price}"
+  end
+end
+
+class Inventory::PenLid < ActiveRecord::Base
+  acts_as :product_feature
+
+  validates_presence_of :color
+end
+
 initialize_database do
   create_table :pens do |t|
     t.string :color
@@ -36,4 +54,14 @@ class Store < ActiveRecord::Base
   create_table :stores do |t|
     t.string :name
   end
+
+  create_table :inventory_pen_lids do |t|
+    t.string :color
+  end
+
+  create_table :inventory_product_features do |t|
+    t.string :name
+    t.float :price
+    t.actable
+  end
 end