Add custom archived scope for ordering

Author: mateusdeap

app/models/puzzle.rb

@@ -2,4 +2,6 @@ class Puzzle < ApplicationRecord
   enum :answer, ruby: 0, rails: 1
   enum :state, { approved: 0, rejected: 1, pending: 2, archived: 3 }
   has_many :answers
+
+  scope :archived, -> { Puzzle.where(state: :archived).order(sent_at: :desc) }
 end