educoder/app/models/repertoire.rb

class Repertoire < ApplicationRecord
  has_many :sub_repertoires, ->{order(updated_at: :desc)}, :dependent => :destroy

  has_many :tag_repertoires, through: :sub_repertoires
  has_many :user_interests, dependent: :delete_all

  after_create_commit :reset_cache_data
  after_update_commit :reset_cache_data

  def self.cache_data
    Rails.cache.fetch(data_cache_key, expires_in: 1.days) do
      Repertoire.select(:id, :name).order(:created_at).as_json
    end
  end

  def self.data_cache_key
    'repertoire/cache_data'
  end

  private

  def reset_cache_data
    Rails.cache.delete(self.class.data_cache_key)
  end
end