app/models/puzzle.rb


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class Puzzle < ApplicationRecord
  extend Enumerize

  has_many :scores

  validates :data, presence: true

  validates :category, presence: true
  enumerize :category, in: [:normal, :hard, :expert], scope: :shallow

  def latest?
    Puzzle.where(category: category).order(created_at: :desc).first.id == id
  end
end