Module: ActiveExchange

Defined in:
lib/active_exchange/active_exchange.rb

Class Method Summary collapse

Class Method Details

.exchange_rate_on(date, currency_from = "USD", currency_to = "AUD") ⇒ Object

used to find an exchange rate on a certain day. this will make a call to the api.



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# File 'lib/active_exchange/active_exchange.rb', line 30

def self.exchange_rate_on(date, currency_from = "USD", currency_to = "AUD")
  xml = retrieve_data(date)
  us_to_eur = 1.0
  au_to_eur = 1.0
  xml.elements.each("//exchange_rates/fx") { |el|
    if el.elements[1].text == currency_from
      us_to_eur = el.elements[2].text.to_f rescue 1.0
    end
    if el.elements[1].text == currency_to
      au_to_eur = el.elements[2].text.to_f rescue 1.0
    end
  }

  return us_to_eur/au_to_eur
end

.get_daily_data ⇒ Object 



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# File 'lib/active_exchange/active_exchange.rb', line 18

def self.get_daily_data
  #Get data
  daily_rates = ActiveExchange.retrieve_data
  #put into database.  Run the migrations, obviously, before you do this.
  if daily_rates.root.attributes["responsecode"] == "200"
    daily_rates.elements.each("//exchange_rates/fx") { |element|
      ExchangeRate.create(:currency => element.elements[1].text, :rate => element.elements[2].text)
    }
  end
end

.retrieve_data(date = Date.today - 1) ⇒ Object

We’ll need to have a task to look for new data and parse it into DB, to cut down calls.



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# File 'lib/active_exchange/active_exchange.rb', line 12

def self.retrieve_data(date = Date.today - 1)
  url = URI.parse("http://api.finance.xaviermedia.com/api/#{date.year}/#{date.strftime("%m")}/#{date.strftime("%d")}.xml")
  resp = Net::HTTP.get(url)
  xml  = REXML::Document.new(resp)
end