Molar

Molar dynamically defines attribute hash getters and setters for your classes.

Work in progress

OpenStruct defines all getters and setters for your hash upon initialization, and will allow you to dynamically add new attributes to your object.

Molar lazily defines getters and setters for your hash, and will not allow you to directly add new attributes after initialization (unless you explicitly add them to the attributes hash).

Add this line to your application's Gemfile:

gem 'molar'

And then execute:

$ bundle

Or install it yourself as:

$ gem install molar

class Jedi
  include Molar

  def initialize(attributes = {})
    @attributes = attributes
  end
end

jedi = Jedi.new(name: 'Luke Skywalker', master: 'Yoda')

jedi.name
# => 'Luke Skywalker'

jedi.master
# => 'Yoda'

jedi.name = 'Anakin'
jedi.name
# => 'Anakin'

Molar defines accessors and setters on the fly so as not to incur the :method_missing penalty on each access. Currently, only lookups in the @attributes instance variable are supported.

Currently, mutation coverage is ~77%, but I haven't yet had a chance to determine how meaningful that is, as this gem uses a couple of items listed under the limitations section for mutant (which is a great tool, by the way).

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

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