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Library for dealing with money and currency conversion
Ruby
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README.rdoc

Money $

This library aids one in handling money and different currencies. Features:

  • Provides a Money class which encapsulates all information about an certain amount of money, such as its value and its currency.

  • Represents monetary values as integers, in cents. This avoids floating point rounding errors.

  • Provides APIs for exchanging money from one currency to another.

  • Has the ability to parse a money string into a Money object.

  • Provides ActiveRecord “has_money” method.

  • Autofetch rates from ECB

Install

gem sources -a http://gems.github.com
gem install <this-fork>-money

Use

Synopsis

require 'money'

# 10.00 USD
money = Money.new(1000, "USD")
money.cents     # => 1000
money.currency  # => "USD"
money.format    # => "$10.00"

Money.new(880088, "EUR").format # => €8,800.88
Money.new(-8000).format(:no_cents => true)  # => $-80

Money.new(1000, "USD") == Money.new(1000, "USD")   # => true
Money.new(1000, "USD") == Money.new( 100, "USD")   # => false
Money.new(1000, "USD") == Money.new(1000, "EUR")   # => false

Rounding

You can use round_to_coin when you don't have currency with coins for cents. E.g. if the smallest coin is 0.50, then

Money.new(1448, 'CZK').round_to_coin(50).to_s  # => "14.50"

Currency Exchange

Exchanging money is performed through an exchange bank object. The default exchange bank object requires one to manually specify the exchange rate. Here's an example of how it works:

Money.add_rate("CAD", 0.803115)
Money.add_rate("USD", 1.24515)

Money.us_dollar(100_00).exchange_to("CAD")  # => Money.new(15504, "CAD")
Money.ca_dollar(100_00).exchange_to("USD")  # => Money.new(6450, "USD")

or

Money.us_dollar(100).as_cad              # => Money.new(155, "CAD")
Money.ca_dollar(100).as_usd              # => Money.new(64, "USD")

Comparison and arithmetic operations work as expected:

Money.new(1000, "USD") <=> Money.new(900, "USD")   # => 1; 9.00 USD is smaller
Money.new(1000, "EUR") + Money.new(10, "EUR") == Money.new(1010, "EUR")

Money.add_rate("EUR", 0.5)
Money.new(1000, "EUR") + Money.new(1000, "USD") == Money.new(1500, "EUR")

Fetch the exchange rates published by the European Bank

Money.default_bank.fetch_rates          # Fetch the rates
Money.default_bank.auto_fetch 3600      # Fetch the rates every hour
Money.default_bank.stop_fetch           # Stop auto-fetch

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

Money.default_bank = ExchangeBankWhichScrapesXeDotCom.new

`new` or `to_money` ?

If you already have a value in integer/float or a string which ruby can parse with `to_i`, use new. It'll avoid the string parser, which is resource intensive.

Default Currency

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

Money.default_currency = "CAD"

If you use Rails, then environment.rb is a very good place to put this.

Autofetch rates

By default, Money won't fetch the rates automatically, you need to call: @some_bank.fetch_rates

If you have your bank default rates configured, it'll fetch all possible rates from it, if you don't, It'll fetch all rates to and from your default_currency.

Money uses the ECB XML Feed. (ecb.int)

Webapps

Ruby on Rails

Use the has_money method to embed the money object in your models. The following example requires a price_cents and a price_currency fields on the database.

config/enviroment.rb

require.gem 'bobek-money', :lib => 'money'

app/models/product.rb

class Product < ActiveRecord::Base
  belongs_to :product
  has_money :price

  validates_numericality_of :price_cents, :greater_than => 0
end

migration:

create_table :products do |t|
  t.integer :price_cents
  t.string  :price_currency
end

jQuery

Check out meiaduzia.com.br/cuducos2/priceformat for a nice mask for webapp's textfields.

About

Resources:

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