Class: Geld::Config

Inherits:
Object
  • Object
show all
Defined in:
lib/geld/config.rb

Instance Method Summary collapse

Instance Method Details

#add_currency(currency, rates) ⇒ Object

Set a new currency configuration. If the rates table is set more than once, the new one overrides the older



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'lib/geld/config.rb', line 6

def add_currency(currency, rates)
  validate_currency(currency)
  validate_rates(rates)

  @currencies ||= {}

  # Converts rates to BigDecimal
  bd_rates = rates.inject({}){|hash, (k,v)| hash[k] = BigDecimal.new(v.to_s); hash }
  @currencies[currency] = bd_rates

  bd_rates.each do |a_currency, a_rate|

    # reverse operation will be the first element
    current_rate = BigDecimal.new("1").div(a_rate, 2) # 1/rate 2 digits
    @currencies[a_currency] = { currency => current_rate }

    # now the others
    (bd_rates.keys - [a_currency]).each do |other_currency|
      @currencies[a_currency][other_currency] = @currencies[currency][other_currency].mult(current_rate, 2)
    end

  end
  # returns the new calculations
  @currencies
end

#get_rate(from, to) ⇒ Object

returns the specific rate



33
34
35
36
37
 
# File 'lib/geld/config.rb', line 33

def get_rate(from, to)
  @currencies &&
  @currencies[from] &&
  @currencies[from][to]
end