This gem downloads the exchange rates from the European Central Bank. You can calculate exchange rates with it. It is compatible with the money gem.
gem install eu_central_bank
With the gem, you do not need to manually add exchange rates. Calling update_rates will download the rates from the European Central Bank. The API is the same as the money gem. Feel free to use Money objects with the bank.
eu_bank = EuCentralBank.new Money.default_bank = eu_bank money1 = Money.new(10) money1.bank # eu_bank # call this before calculating exchange rates # this will download the rates from ECB eu_bank.update_rates # exchange 100 CAD to USD # API is the same as the money gem eu_bank.exchange(100, "CAD", "USD") # Money.new(80, "USD") Money.us_dollar(100).exchange_to("CAD") # Money.new(124, "CAD") # using the new exchange_with method eu_bank.exchange_with(Money.new(100, "CAD"), "USD") # Money.new(80, "USD")
For performance reasons, you may prefer to read from a file instead. Furthermore, ECB publishes their rates daily. It makes sense to save the rates in a file to read from. It also adds an update_at field so that you can manage the update.
# cached location cache = "/some/file/location/exchange_rates.xml" # saves the rates in a specified location eu_bank.save_rates(cache) # reads the rates from the specified location eu_bank.update_rates(cache) if !eu_bank.rates_updated_at || eu_bank.rates_updated_at < Time.now - 1.days eu_bank.save_rates(cache) eu_bank.update_rates(cache) end # exchange 100 CAD to USD as usual eu_bank.exchange_with(Money.new(100, "CAD"), "USD") # Money.new(80, "USD")
Note on Patches/Pull Requests
- Fork the project.
- Make your feature addition or bug fix.
- Add tests 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)
Copyright (c) 2010-2013 RubyMoney. See LICENSE for details.