# CNB

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CNB is a gem that will help you get daily and monthly currency rates for czech crown (CZK) from Czech National Bank.

## Install



Add following into your Gemfile

```ruby
gem 'cnb'
```

Or install the gem by on your own

```ruby
gem install cnb
```

## Usage

### Daily

```ruby
CNB.daily_rate('AUD', Date.today)
```

Returns today's exchange rate between CZK and AUD.
Input date defaults to Date.today so the above line can written like this:

```ruby
CNB.daily_rate('AUD')
```

### Monthly

```ruby
CNB.monthly_rate('ALL', Date.today)
```

Returns today's exchange rate between CZK and ALL (Albanian lek).

#### Exceptions
* DateTooOld - triggers when date entered is older than 24 years, or 10 years if monthly.
* DateInFuture - triggers when date enetered is in future.
* CurrencyMissing - triggers when currency is not present.
* CurrencyNotSupported - triggers when currency is not in downloaded list of currencies.

## Contributing

1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request


## License
MIT License. Copyright (c) 2014


Jan Zikán

Tomas Koutsky

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cnb

CNB

Install

Usage

Daily

Monthly

Exceptions

Contributing

License

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