simple_currency

A really simple currency converter using XavierMedia API. Compatible with Ruby 1.8, 1.9, JRuby 1.5.3 and Rubinius 1.1.

Notes

Since version 1.2, simple_currency no longer uses Xurrency API in its background, due to restrictions on the number of daily requests. If you would like to use it, please use the fork by Alfonso Jiménez, author and maintainer of xurrency.com service.

Usage

Just require it and all your numeric stuff gets this fancy DSL for free:

30.eur.to_usd
# => 38.08

150.eur.to_usd
# => 190.4
239.usd.to_eur
# => 187.98 
# These don't even hit the Internets!
# (They take advantage of Rails cache)

70.usd.to_chf
# => 71.9

But what if you want to do the currency exchange according to a specific date in the past? Just do this:

# You can use any time or date object
42.eur.at(1.year.ago).to_usd
# => 60.12
42.eur.at(Time.parse('2009-09-01')).to_usd
# => 60.12

You can also add an subtract money expressions, which will return a result converted to the former currency of the expression:

42.eur + 30.usd
# => The same as adding 42 and 30.usd.to_eur

10.gbp + 1.eur
# => The same as adding 10 and 1.eur.to_gbp

Installation

Rails 3

In your Gemfile:

gem "simple_currency"

Not using Rails?

Then you have to manually install the gem:

gem install simple_currency

And manually require it as well:

require "simple_currency"

Note on Patches/Pull Requests

Fork the project.
Make your feature addition or bug fix.
Add specs for it. This is important so I don't break it in a future version unintentionally.
Commit, do not mess with rakefile, version, or history. If you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull.
Send me a pull request. Bonus points for topic branches.