formatted_attributes

Add methods that format attributes from/to helper methods. Works with ActiveRecord and non-ActiveRecord classes.

gem install formatted_attributes

Or add the following line to your project's Gemfile:

gem "formatted_attributes"

A formatted attribute will require two methods: convert_with_#{formatter} and convert_from_#{formatter}. The convert_from_* method will convert the formatted value to the original value and the convert_with_* method will do the other way around, converting the original value to the formatted version.

See an example on how to format prices from strings like 1,23 to cents like 123 and vice-versa.

class Product < ActiveRecord::Base
  include ActionView::Helpers::NumberHelper

  formatted :price, with: :number_format

  private
  def convert_with_number_format(amount)
    number = BigDecimal(number.to_s) / 100
    number_to_currency(number, unit: "", separator: ",", delimiter: "")
  end

  def convert_from_number_format(amount)
    _, operator, number, precision = *number.to_s.match(/^([+-])?(\d+)(?:[,.](\d+))?$/)
    (BigDecimal("#{operator}#{number}.#{precision.to_i}") * 100).to_i
  end
end

product = Product.new(formatted_price: "1,23")
product.price
#=> 123

product.price = 456
product.formatted_price
#=> "4,56"

• Nando Vieira

• https://github.com/fnando/formatted_attributes/contributors

For more details about how to contribute, please read https://github.com/fnando/formatted_attributes/blob/main/CONTRIBUTING.md.

The gem is available as open source under the terms of the MIT License. A copy of the license can be found at https://github.com/fnando/formatted_attributes/blob/main/LICENSE.md.

Everyone interacting in the formatted_attributes project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.