if Hancock.mongoid?

  module Hancock::Cacheable
    extend ActiveSupport::Concern

    included do
      field :cache_keys_str, type: String, default: -> { default_cache_keys.join("\n") }
      def self.default_cache_keys
        []
      end
      def default_cache_keys
        self.class.default_cache_keys
      end

      def cache_keys
        cache_keys_str.split(/\s+/).map { |k| k.strip }.reject { |k| k.blank? }
      end
      field :perform_caching, type: Boolean, default: true

      after_touch :clear_cache
      after_save :clear_cache
      after_destroy :clear_cache
      def clear_cache
        if perform_caching
          cache_keys.each do |k|
            Rails.cache.delete(k)
          end
        end
      end

    end
  end

end