Money Open Exchange Rates
A gem that calculates the exchange rate using published rates from open-exchange-rates
Check api documentation
- Live and historical exchange rates for 180 currencies.
- Free plan hourly updates, with USD base and up to 1,000 requests/month.
- Currency caching.
- Calculate pair rates.
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
gem install money-open-exchange-rates
require 'money/bank/open_exchange_rates_bank' oxr = Money::Bank::OpenExchangeRatesBank.new oxr.cache = 'path/to/file/cache.json' oxr.app_id = 'your app id from https://openexchangerates.org/signup' oxr.update_rates # (optional) # set the seconds after than the current rates are automatically expired # by default, they never expire, in this example 1 day. oxr.ttl_in_seconds = 86400 # (optional) # use https to fetch rates from Open Exchange Rates # disabled by default to support free-tier users # see https://openexchangerates.org/documentation#https oxr.secure_connection = true # (optional) # set historical date of the rate # see https://openexchangerates.org/documentation#historical-data oxr.date = '2015-01-01' # (optional) # Set the base currency for all rates. By default, USD is used. # OpenExchangeRates only allows USD as base currency # for the free plan users. oxr.source = 'USD' # Store in cache # If you are using unicorn-worker-killer gem or on Heroku like platform, # you should avoid to put this on the initializer of your Rails application, # because will increase your OXR API usage. oxr.save_rates Money.default_bank = oxr Money.default_bank.get_rate('USD', 'CAD')
You can also provide a Proc as a cache to provide your own caching mechanism
perhaps with Redis or just a thread safe
Hash (global). For example:
oxr.cache = Proc.new do |v| key = 'money:exchange_rates' if v Thread.current[key] = v else Thread.current[key] end end
Unknown pair rates are transparently calculated: using inverse rate (if known), or using base currency rate to both currencies forming the pair.
bundle exec rake
The MIT License
Copyright © 2011-2016 Laurent Arnoud email@example.com