Leetsoft's Money library
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Locale support:
   number.format.separator = "," (I18n)
   number.format.separator = "." (I18n)
   Money.ca_dollar(100).to_s => "1,00"
   '100,37'.to_money #=> #<Money @cents=10037>

Wen using an input field for money, it shows the money in your locale, and it accepts money in your locale.


This library makes it easier to deal with Money values, storing them as integers to avoid floating-point math errors.


Preferred method of installation is gem:

gem install --source http://gems.github.com collectiveidea-money

You can find the source at:



There is a rails extension that makes it easier to store money values in the database.

class Product < ActiveRecord::Base
  money :price
  validates_numericality_of :price_in_cents, :greater_than => 0

This assumes that there is a price_in_cents (integer) column in the database, which can be changed by passing the :cents option. You can also specify the :currency option to save the currency to a field in the database.

class Room < ActiveRecord::Base
  money :rate, :cents => :rate_cents, :currency => :rate_currency
  money :discount, :cents => :discount_cents

You can set the attribute to a String, Fixnum, or Float and it will call #to_money to convert it to a Money object. This makes it convenient for using money fields in forms.

r = Room.new :rate => "100.00"
r.rate  # returns <Money:0x249ef9c @currency="USD", @cents=10000>

By default, money values will be stored with a precision of 2 (cents). If you need to store different precisions, such as to the nearest tenth of a cent, you can specify the :precision option:

class Room < ActiveRecord::Base
  money :rate, :precision => 3

r = Room.new :rate => "100"
r.rate.format  # returns $100.000
r.rate = "100.995"
r.rate.format  # returns $100.995

To use the Rails functionality, install money as a plugin, or require 'money/rails'. This version is compatible with Rails 2.2. For compatibility with previous versions of Rails, check out the rails-2.1 branch.

Class configuration

Two const class variables are available to tailor Money to your needs. If you don't need currency exchange at all, just ignore those.

Default Currency

By default Money defaults to USD as its currency. This can be overwritten using

Money.default_currency = "CAD"

If you use rails, the environment.rb is a very good place to put this.

Currency Exchange

The second parameter is a bit more complex. It lets you provide your own implementation of the currency exchange service. By default Money throws an exception when trying to call .exchange_to.

A second minimalist implementation is provided which lets you supply custom exchange rates:

Money.bank = VariableExchangeBank.new 
Money.bank.add_rate("USD", "CAD", 1.24515)
Money.bank.add_rate("CAD", "USD", 0.803115)
Money.us_dollar(100).exchange_to("CAD") => Money.ca_dollar(124)
Money.ca_dollar(100).exchange_to("USD") => Money.us_dollar(80)

There is nothing stopping you from creating bank objects which scrape www.xe.com for the current rates or just return rand(2)


If you have any improvements please email them to tobi [at] leetsoft.com