Mapper for Virtus attributes

NOTE: Recent commits allow for mixing in Virtus modules to Virtus object instances, which is a break from recommended Virtus usage.

Add this line to your application's Gemfile:

gem 'virtus-mapper'

And then execute:

$ bundle

Or install it yourself as:

$ gem install virtus-mapper

In your Virtus attributes, set the :from option to a symbol to translate keys on object initialization. In the example below, :surname gets translated into :last_name. If the :from option is set to an object that respond_to?(:call), the object will be called and passed the attributes hash.

class Person
  include Virtus.model
  include Virtus::Mapper

  attribute :first_name, String
  attribute :last_name, String, from: :surname
  attribute :address,
            String,
            default: '',
            from: lambda { |atts| atts[:address][:street] rescue '' }
end

person = Person.new({ first_name: 'John',
                      surname: 'Doe',
                      address: { 'street' => '1122 Boogie Avenue' } })
person.first_name # => 'John'
person.last_name # => 'Doe'
person.address # => '1122 Boogie Avenue'
person.surname # => NoMethodError

1. Fork it ( https://github.com/[my-github-username]/virtus-mapper/fork )
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 a new Pull Request