added default attachment location to LO serializer

app/models/learning_object.rb

@@ -109,6 +109,10 @@ class LearningObject < ApplicationRecord
     nil
   end
 
+  def default_attachment_location
+    object_type.try(:name) == ("Vídeo" || "Áudio") ? default_attachment.try(:retrieve_cache_link) : default_attachment.try(:retrieve_url)
+  end
+
   def default_thumbnail
     return thumbnail unless thumbnail.blank?
     return nil if attachments.blank?
@@ -125,10 +129,6 @@ class LearningObject < ApplicationRecord
     default_attachment.retrieve_cache_link
   end
 
-  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

app/serializers/learning_object_serializer.rb

@@ -37,6 +37,7 @@ class LearningObjectSerializer < ActiveModel::Serializer
     :thumbnail,
     :object_type,
     :language,
+    :default_attachment_location,
     :default_attachment_id,
     :default_mime_type,
     :score,