diff --git a/app/models/metadata_array.rb b/app/models/metadata_array.rb
index 5f43b790..8d951a14 100644
--- a/app/models/metadata_array.rb
+++ b/app/models/metadata_array.rb
@@ -21,6 +21,8 @@ class MetadataArray < MetadataTemplate
     value.join(', ')
   end
 
+  alias indexable_values values
+
   private
 
   # TODO: Sanitizar otros valores
diff --git a/app/models/metadata_related_posts.rb b/app/models/metadata_related_posts.rb
index bcc18d86..4c022fff 100644
--- a/app/models/metadata_related_posts.rb
+++ b/app/models/metadata_related_posts.rb
@@ -22,6 +22,10 @@ class MetadataRelatedPosts < MetadataArray
     false
   end
 
+  def indexable_values
+    values.keys
+  end
+
   private
 
   # Obtiene todos los posts y opcionalmente los filtra