Module: ExchangeRate

Defined in:
lib/exchange_rate.rb,
lib/exchange_rate/version.rb,
lib/exchange_rate/currency.rb,
lib/exchange_rate/rates_data_source.rb

Defined Under Namespace

Modules: Config Classes: Currency, CurrencyNotFound, NoRateForGivenDate, RatesDataSource

Constant Summary collapse

VERSION = 
"0.0.1"

Class Method Summary collapse

Class Method Details

.at(date, base_currency_symbol, counter_currency_symbol) ⇒ Object 



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# File 'lib/exchange_rate.rb', line 34

def self.at(date, base_currency_symbol, counter_currency_symbol)
  data_source = RatesDataSource.new

  base_currency_rate = data_source.find_rate_by_date_and_currency(
    date, base_currency_symbol)

  counter_currency_rate = data_source.find_rate_by_date_and_currency(
    date, counter_currency_symbol)

  rate = calculate_rate(base_currency_rate.to_f, counter_currency_rate.to_f)
end

.calculate_rate(base_rate, counter_rate) ⇒ Object 



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# File 'lib/exchange_rate.rb', line 46

def self.calculate_rate(base_rate, counter_rate)
  rate = counter_rate / base_rate
  rate.round(3)
end