module AttributesNormalizer
  extend ActiveSupport::Concern

  included do
    before_save :normalize_attributes
  end

  def excluded_normalized_attrs
    []
  end

  def normalize_attributes
    self.attributes.each do |k, v|
      unless excluded_normalized_attrs.include?(k.to_sym) || !v.is_a?(String)
        self.send("#{k}=", v.mb_chars.upcase)
      end
    end
  end
end