Fixed download link, added comments

app/models/learning_object.rb

@@ -109,6 +109,7 @@ class LearningObject < ApplicationRecord
     nil
   end
 
+  # If a LO has more than one object, this gives the location of the main one
   def default_attachment_location
     object_type.try(:name) == ("Vídeo" || "Áudio") ? default_attachment.try(:retrieve_cache_link) : default_attachment.try(:retrieve_url)
   end
@@ -129,6 +130,11 @@ class LearningObject < ApplicationRecord
     default_attachment.retrieve_cache_link
   end
 
+  # Download link with all relevant objects (currently only one)
+  def download_link
+    object_type.try(:name) == ("Vídeo" || "Áudio") ? default_attachment.try(:retrieve_cache_link) : default_attachment.try(:retrieve_url)
+  end
+
   ## score methods
   def normalized_collected
     max = CollectionItem.where(collectionable_type: 'LearningObject').group(:collectionable_id).order('count_all DESC').count