module HasWhatnot
  extend ActiveSupport::Concern

  included do
    def whatnot
      @whatnot ||= super.is_a?(Hash) ? super.deep_symbolize_keys! : nil
    end

    def tags
      whatnot && whatnot[:tags] ? whatnot[:tags] : []
    end

    def has_tag?(tag)
      return false unless tags.any?
      tags.include?(tag)
    end

    def where_has_tag(tag)
      where("whatnot->'tags' ? :tag", tag: tag)
    end
  end
end