Allow multiple digital files to be attached to a single variant.

Useful for multi-format ebook downloads

app/models/spree/line_item_decorator.rb

@@ -1,10 +1,8 @@
 Spree::LineItem.class_eval do
   
   has_many :digital_links, :dependent => :destroy
-  
   after_save :create_digital_links, :if => :digital?
   
-  # Is this item digital?
   def digital?
     variant.digital?
   end
@@ -15,8 +13,10 @@ Spree::LineItem.class_eval do
   def create_digital_links
     digital_links.delete_all
 
-    self.quantity.times do
-      digital_links.create!(:digital => variant.digital)
+    variant.digitals.each do |digital|
+      self.quantity.times do
+        digital_links.create!(:digital => digital)
+      end      
     end
   end
   

app/models/spree/variant_decorator.rb

@@ -1,11 +1,11 @@
 Spree::Variant.class_eval do
   
-  has_one :digital, :dependent => :destroy
+  has_many :digitals, :dependent => :destroy
   after_save :destroy_digital, :if => :deleted?
   
   # Is this variant to be downloaded by the customer?
   def digital?
-    digital.present?
+    digitals.present?
   end
   
   private