diff --git a/app/models/metadata_path.rb b/app/models/metadata_path.rb
index 474ddee..7f38692 100644
--- a/app/models/metadata_path.rb
+++ b/app/models/metadata_path.rb
@@ -21,6 +21,9 @@ class MetadataPath < MetadataTemplate
     File.basename(value, ext)
   end
 
+  # No lo aceptamos en los parámetros
+  def to_param; end
+
   private
 
   def ext