Installation

Add this line to your application's Gemfile:

gem 'vlatko_dawanda'

And then execute:

$ bundle

Or install it yourself as:

$ gem install vlatko_dawanda

Usage

# 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

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/vlatko_dawanda. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.