fix output

test/dummy/app/models/song.rb

@@ -1,2 +1,9 @@
 class Song < ApplicationRecord
+
+  def inspect
+    # this makes the output consistent across Ruby versions
+    title = self.title.present? ? "\"#{self.title}\"" : "nil"
+    id = self.id.present? ? self.id : "nil"
+    %{#<Song id: #{id}, title: #{title}>}
+  end
 end