Inum(enumerated type of Integer) provide a Java-enum-like Enum. Inum has a function to localize by i18n.

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Add this line to your application's Gemfile:

gem 'inum'

And then execute:

$ bundle

Or install it yourself as:

$ gem install inum


Define Enum(Inum)

For example create enum(inum) of Japanese Anime.

class AnimeTypes < Inum::Base
  define :EVANGELION, 0
  define :HARUHI,     1
  define :NYARUKO,    2

If the value(integer) is omitted, It is auto-incremented.(deprecated.)

Use Enum(Inum)

How to use Enum(Inum).

p AnimeTypes::EVANGELION.label      # => :EVANGELION
p AnimeTypes::EVANGELION.to_s       # => "EVANGELION"
p AnimeTypes::EVANGELION.downcase   # => "evangelion"
p AnimeTypes::EVANGELION.underscore # => "evangelion"
p AnimeTypes::EVANGELION.upcase     # => "EVANGELION"
p AnimeTypes::EVANGELION.value      # => 0 (can use to_i.)
p AnimeTypes::EVANGELION.translate  # => エヴァンゲリオン (I18n.t will be called with `anime_types.evangelion`.)

# Parse object.
# This method is parsable Symbol and String and Integer and Self.
p AnimeTypes.parse(1) # => AnimeTypes::HARUHI

# Compare object.
p AnimeTypes::HARUHI.eql?('HARUHI')   # => true (This method can compare all parsable object.)

# each method.
AnimeTypes.each {|enum| p enum}

# Get length
AnimeTypes.length # => 3

# Get labels and values
AnimeTypes.labels # => [:EVANGELION, :HARUHI, :NYARUKO]
AnimeTypes.values # => [0, 1, 2]

# Get form items.
AnimeTypes.form_items # => [['エヴァンゲリオン', 'EVANGELION'], ['涼宮ハルヒの憂鬱', 'HARUHI'], ....]

# form_items usually use with some rails view helpers.
# :name, Enum.form_items
# :name, Enum.form_items(except:[:EVANGELION])
# :name, Enum.form_items(only:[:EVANGELION])

can use Enumerable and Comparable.

If use ActiveRecord, can use bind_inum

class Favorite < ActiveRecord::Base
  bind_inum :anime, AnimeTypes

bind_enum wrap accessor of column.

fav = AnimeTypes::NYARUKO)

# #getter will return instance of AnimeTypes.
p fav.anime.t # => '這いよれ!ニャル子さん' t is aliased translate.

# #setter can set parsable object.
anime.type = 1
anime.type = '1'
anime.type = 'NYARUKO'

# check methods.
p fav.anime_evangelion? # => false


translate methods localize enum by i18n. default i18n key is #{name_space}.#{class_name}.#{label}.

    evangelion: 'エヴァンゲリオン'
    haruhi:     'ハルヒ'
    nyaruko:    '這いよれ!ニャル子さん'

If you want to change key of i18n, Override i18n_key class method.

class AnimeTypes < Inum::Base
  def self.i18n_key(underscore_class_path, underscore_label)



  1. Fork it
  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 new Pull Request


$ bundle exec rspec