added brands

back-office/app/models/brand.rb

@@ -0,0 +1,3 @@
+class Brand < ActiveRecord::Base
+    has_many :items
+end

back-office/app/models/item.rb

@@ -3,6 +3,7 @@ class Item < ActiveRecord::Base
   has_many :multi_media_descriptions
   belongs_to :sub_category
   belongs_to :supplier
+  belongs_to :brand
   has_and_belongs_to_many :item_groups,                                                       :join_table => 'item_item_groups'
 
   validates_presence_of :name, :description, :list_price, :current_input_price, :tags, :unit_id, :code, :sub_category_id, :weight, :supplier_id