Using resource controller and namespace

app/models/spree/digital.rb

@@ -0,0 +1,11 @@
+module Spree
+  class Digital < ActiveRecord::Base
+    belongs_to :variant
+    has_many :digital_links, :dependent => :destroy
+  
+    has_attached_file :attachment, :path => ":rails_root/private/digitals/:id/:basename.:extension"
+  
+    # TODO: Limit the attachment to one single file. Paperclip supports many by default :/
+      
+  end
+end