Search for digitals through variants

app/controllers/spree/admin/digitals_controller.rb

@@ -2,11 +2,6 @@ module Spree
   class Admin::DigitalsController < Spree::Admin::ResourceController
     belongs_to "spree/product", find_by: :permalink
     
-    def load_resource
-      @object = @product = Product.find_by_permalink(params[:product_id])
-    end
-
-    
     protected
       def location_after_save
         admin_product_digitals_url(@product)

app/models/spree/product_decorator.rb

@@ -0,0 +1,4 @@
+
+Spree::Product.class_eval do
+  has_many :digitals, :through => :variants_including_master
+end