Rails: How to use i18n with Rails 4 enums

Question

Rails 4 Active Record Enums are great, but what is the right pattern for translating with i18n?

Answer 1

Try using TranslateEnum gem for these purposes

class Post < ActiveRecord::Base
  enum status: { published: 0, archive: 1 }
  translate_enum :status
end


Post.translated_status(:published)
Post.translated_statuses

@post = Post.new(status: :published)
@post.translated_status 

Answer 2

Try the enum_help gem. From its description:

Help ActiveRecord::Enum feature to work fine with I18n and simple_form.

Answer 3

Heres a t_enum helper method that I use.

<%= t_enum(@user, :status) %>

enum_helper.rb:

module EnumHelper

  def t_enum(inst, enum)
    value = inst.send(enum);
    t_enum_class(inst.class, enum, value)
  end

  def t_enum_class(klass, enum, value)
    unless value.blank?
      I18n.t("activerecord.enums.#{klass.to_s.demodulize.underscore}.#{enum}.#{value}")
    end
  end

end

user.rb:

class User < ActiveRecord::Base
  enum status: [:active, :pending, :archived]
end 

en.yml:

en:
  activerecord:
    enums:
      user:
        status:
          active:   "Active"
          pending:  "Pending..."
          archived: "Archived"

Answer 4

Here is a view:

select_tag :gender, options_for_select(Profile.gender_attributes_for_select)

Here is a model (you can move this code into a helper or a decorator actually)

class Profile < ActiveRecord::Base
  enum gender: {male: 1, female: 2, trans: 3}

  # @return [Array<Array>]
  def self.gender_attributes_for_select
    genders.map do |gender, _|
      [I18n.t("activerecord.attributes.#{model_name.i18n_key}.genders.#{gender}"), gender]
    end
  end
end

And here is locale file:

en:
  activerecord:
    attributes:
      profile:
        genders:
          male: Male
          female: Female
          trans: Trans

Answer 5

Elaborating on user3647358's answer, you can accomplish that very closely to what you're used to when translating attributes names.

Locale file:

en:
  activerecord:
    attributes:
      profile:
        genders:
          male: Male
          female: Female
          trans: Trans

Translate by calling I18n#t:

profile = Profile.first
I18n.t(profile.gender, scope: [:activerecord, :attributes, :profile, :genders])

Answer 6

I prefer a simple helper in application_helper

  def translate_enum(object, enum_name)
    I18n.t("activerecord.attributes.#{object.model_name.i18n_key}.#{enum_name.to_s.pluralize}.#{object.send(enum_name)}")
  end

Then in my YML file :

fr:
  activerecord:
    attributes:
      my_model:
        my_enum_plural:
          pending:  "En cours"
          accepted: "Accepté"
          refused:  "Refusé"