Merge branch 'fix-retrieve-url' into 'master'

Fix retrieve url

See merge request !329

app/serializers/learning_object_serializer.rb

@@ -2,7 +2,7 @@ class LearningObjectSerializer < ActiveModel::Serializer
   cache key: 'learning_object', expires_in: 4.hours
 
   def default_location
-    object.default_attachment.try(:retrieve_url)
+    object_type == ("Vídeo" || "Áudio") ? object.default_attachment.try(:retrieve_cache_link) : object.default_attachment.try(:retrieve_url)
   end
 
   def default_mime_type