A gem to serialize objects using a similar API to active_model_serializers. It technically doesn't require that you use Rails, but it does leverage some Active Support modules so it's geared towards rails apps.

Add this line to your application's Gemfile:

gem 'kix'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install kix

  class UserSerializer < Kix::Serializer
    attributes :name, :email, :phone, :skippable

    def phone
      _object.phone_number || "N/A"
    end

    def skippable
      # throw skip if you want to omit this attribute entirely
      throw(:skip)
    end
  end

  class User
    include Kix::Serializable
    attr_reader :name, :email, :phone_number

    def initialize(name, email, phone_number = nil)
      @name = name
      @email = email
      @phone_number = phone_number
    end
  end

User.new("John", "john@example.com").as_json
#=> {"name"=>"John", "email"=>"john@example.com", "phone"=>"N/A"}

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 the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/kix.

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