DaMoney is a gem for dealing with Money in different currencies. With DaMoney you can convert money into different currencies, perform calculations between money amounts of the same or different currency and compare money amounts of the same or different currency.

Add this line to your application's Gemfile:

gem 'da_money', git: '[email protected]:sgrosse/da_money.git'

And then execute:

$ bundle

Place a YAML file with your desired currencies and conversion rates at config/conversion_rates.yml e.g.

---
USD:
  EUR: 0.890295
  XBT: 0.000438134
EUR:
  USD: 1.12422
  XBT: 0.000500814
XBT:
  EUR: 2282.41
  USD: 2565.9
...

Creating a new DaMoney::Money object:

fifty_eur = DaMoney::Money.new(50, 'EUR')
 => 50.00 EUR 

twenty_dollars = DaMoney::Money.new(20, 'USD')
 => 20.00 USD

Get amount and currency of a DaMoney::Money object:

fifty_eur.amount
 => 50.0 

fifty_eur.currency
 => "EUR"

fifty_eur.inspect
 => "50.00 EUR" 

Converting into different currencies:

DaMoney::Money.new(20, 'USD').convert_to('EUR')
 => 17.81 EUR 

Add or substract DaMoney::Money with other DaMoney::Money objects:

fifty_eur + twenty_dollars
 => 67.81 EUR

fifty_eur - twenty_dollars
 => 32.19 EUR

Divide or multiply DaMoney::Money by Numeric.

fifty_eur / 2
 => 25.00 EUR 

twenty_dollars * 3
 => 60.00 USD 

Comparison of DaMoney::Money objects:

twenty_dollars == DaMoney::Money.new(20, 'USD')
 => true 

twenty_dollars == DaMoney::Money.new(30, 'USD')
 => false

fifty_eur_in_usd = fifty_eur.convert_to('USD')
 => 56.21 USD 

fifty_eur_in_usd == fifty_eur
 => true

twenty_dollars > DaMoney::Money.new(5, 'USD')
 => true

twenty_dollars < fifty_eur
 => true 

For testing via rspec execute:

$ rspec

Possible todos for further development:

• Add more test cases
• Using real time currencies from a provider like currencylayer.com

The gem is available as open source under the terms of the MIT License.