gem 'vlatko_dawanda'

# First and foremost configure the currency rates with respect to a base currency (here EUR).

Money.conversion_rates('EUR', {
  'USD'     => 1.11,
  'Bitcoin' => 0.0047
})

# If you wish you can configure your own Bank class where you can inherit from VlatkoDawanda::Bank and then override the parsing methods (look into the Bank class).

class DeutscheBank < VlatkoDawanda::Bank

  def parse_currencies(base_currency, currencies)
    # your own implementation
  end
end

# But be carefull the Currency initialize expects hash as an orgument

# You can then make the default Bank to be your class

Money.default_bank = DeutscheBank.new

# Instantiate money objects (If you haven't configure a currency you can't instantiate a Money object with that currency):

fifty_eur = Money.new(50, 'EUR')

# Get amount and currency:

fifty_eur.amount   # => 50
fifty_eur.currency # => "EUR"
fifty_eur.inspect  # => "50.00 EUR"

# Convert to a different currency (should return a Money
# instance, not a String):

fifty_eur.convert_to('USD') # => 55.50 USD

# Perform operations in different currencies:

twenty_dollars = Money.new(20, 'USD')

# Arithmetics:

fifty_eur + twenty_dollars # => 68.02 EUR
fifty_eur - twenty_dollars # => 31.98 EUR
fifty_eur / 2              # => 25 EUR
twenty_dollars * 3         # => 60 USD

# Comparisons (also in different currencies):

twenty_dollars == Money.new(20, 'USD') # => true
twenty_dollars == Money.new(30, 'USD') # => false

fifty_eur_in_usd = fifty_eur.convert_to('USD')
fifty_eur_in_usd == fifty_eur          # => true

twenty_dollars > Money.new(5, 'USD')   # => true
twenty_dollars < fifty_eur             # => true