require 'russian_central_bank'
# Today rates
Money::Bank::RussianCentralBankFetcher.new.perform()
# => [{:code=>"USD", :nominal=>1, :value=>65.1639}, ...]
# For any other date
Money::Bank::RussianCentralBankFetcher.new.perform(Date.new(2010, 12, 31))
# => [{:code=>"USD", :nominal=>1, :value=>30.4769}, ...]

require 'russian_central_bank'
Money.locale_backend = :currency
bank = Money::Bank::RussianCentralBank.new
Money.default_bank = bank
# Load today's rates
bank.update_rates
# Exchange 1000 USD to RUB
Money.new(1000_00, "USD").exchange_to('RUB').format  # => 64.592,50 ₽
# Use indirect exchange rates, USD -> RUB -> EUR
Money.new(1000_00, "USD").exchange_to('EUR').format  # => €888,26

# Specify rates date
bank.update_rates(Date.new(2010, 12, 31))
Money.new(1000_00, "USD").exchange_to('RUB').format  # => 30.476,90 ₽
# Check last rates update
bank.rates_updated_at
# Check on which date rates were updated
bank.rates_updated_on

# Use ttl attribute to enable rates autoupdate
bank.ttl = 1.day
# Check expiration date
bank.rates_expired_at

bank = Money::Bank::RussianCentralBank.new
begin
  bank.update_rates
rescue Money::Bank::RussianCentralBankFetcher::FetchError => e
  Rails.logger.info "CBR failed: #{e.response}"
  ## fallback
  Money.default_bank = Money::Bank::VariableExchange.new
  Money.default_bank.add_rate(:usd, :eur, 1.3)
  Money.default_bank.add_rate(:eur, :usd, 0.7)
end