Class: SKVReport::ExchangeRates

Inherits:
Object
  • Object
show all
Defined in:
lib/skv_report/exchange_rates.rb

Overview

Fetches relevant exchange rate for given date and given currency

Defined Under Namespace

Classes: NoRateForCurrencyError, NoRatesForDateError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rates = {}) ⇒ ExchangeRates

Returns a new instance of ExchangeRates.



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# File 'lib/skv_report/exchange_rates.rb', line 14

def initialize(rates = {})
  @rates = rates['rates'] || rates['dates_with_rates']
  @base_currency = rates['base']
end

Instance Attribute Details

#base_currency ⇒ Object (readonly)

Returns the value of attribute base_currency.



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# File 'lib/skv_report/exchange_rates.rb', line 12

def base_currency
  @base_currency
end

#rates ⇒ Object (readonly)

Returns the value of attribute rates.



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# File 'lib/skv_report/exchange_rates.rb', line 12

def rates
  @rates
end

Instance Method Details

#rate_for(from_currency, date) ⇒ Object

Raises:



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# File 'lib/skv_report/exchange_rates.rb', line 19

def rate_for(from_currency, date)
  date_rates = rates[date]
  raise_no_rates_for_date_error(date) if date_rates.nil?

  rate = rates.dig(date, from_currency.upcase)
  return rate unless rate.nil?

  raise NoRateForCurrencyError,
        "currency: #{from_currency}\nrates: #{rates}"
end