I recommend you use Struct.new(..., keyword_init: true)

KStruct generates lightweight ruby classes with accessor methods and keyword initializers. It's intended to be used in similar places to the Standard Library's Struct class.

Unlike Struct, it does not not pollute subclasses with lots of methods. The constructor and accessor methods are the only methods inherited.

Add this line to your application's Gemfile:

gem 'kstruct'

And then execute:

$ bundle

Or install it yourself as:

$ gem install kstruct

require 'kstruct'

class Barrel < KStruct.new(:fish)
  def shoot!
    fish.pop
  end
end

barrel = Barrel.new fish: [:trout, :salmon, :shark]
barrel.shoot! # => :shark
barrel.shoot! # => :salmon
barrel.shoot! # => :trout
barrel.shoot! # => nil

barrel.fish = [:swedish]
barrel.fish # => [:swedish]

After checking out the repo, run bin/setup to install dependencies. Then, run rake test 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.

Bug reports and pull requests are welcome on GitHub at https://github.com/existentialmutt/kstruct. 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.

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