EnumBehavior

EnumBehavior is simple polymorphic behavior with Enum related object and delegation.

Add this line to your application's Gemfile:

gem 'enum_behavior'

And then execute:

$ bundle

Or install it yourself as:

$ gem install enum_behavior

1. Add include EnumBehavior to your ActiveRecord model class.

class Music < ActiveRecord::Base
  include EnumBehavior
end

# You can do this at super class such as ApplicationRecord.

2. Add enum_behavior after enum declaration.

class Music < ApplicationRecord
  enum genre: { pop: 0, rock: 1, metal: 2 }
  enum_behavior :genre
end

3. Define class related enum values

module Musics # Pluralized behavior defined class name
  class Pop < EnumBehavior::Base
    def message
      'Love Musics'
    end
  end

  class Metal
    # you can define plain class instead of using EnumBehavior::Base.
    # Require constructor with 1 argument. (passes related ActiveRecord instance)
    def initialize(model)
      @model = model
    end

    attr_reader :model

    def message
      'Love HeavyMetal!'
    end
  end
end

4. Simple polymorphic behavior!

m = Music.new(genre: :pop)
m.genre_behavior.message # => Love Musics

m.genre = :metal
m.genre_behavior.message # => Love HeavyMetal!

m.genre = :rock
m.genre_behavior.message # => NameError uninitialized constant Musics::Rock

# You can use with delegate
# delegate :message, to: :genre_behavior, prefix: :genre
# m.genre_message

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 tags, and push the .gem file to rubygems.org.

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

Everyone interacting in the EnumBehavior project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.