TranslateEnum

Simple, zero-dependant enum translation gem for Rails

Installation

gem install translate_enum

Usage

Here is a regular use case. ActiveRecord model:

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

Localization file

en:
  activerecord:
    attributes:
      post:
        status_list:
          published: Was published
          archive: Was archived

Or if you wish your locales to be available across all models

en:
  attributes:
    status_list:
      published: Was published
      archive: Was archived

Post.translated_status(:published) #=> "Was published"
Post.translated_statuses => [["Was published", :published, 0], ["Was archived", :archive, 1]]

@post = Post.new(status: :published)
@post.translated_status #=> "Was published"

# Each `translated` method supports 
# I18n.translate attributes:

Post.translated_status(:published, raise: true, throw: true, locale: :en, count: 10)

Use in a Form

= form_for @post do |f|
  = f.select :status, options_for_select(f.object.class.translated_statuses.map { |translation, k, _v| [translation, k] })

Extending ActiveRecord

Be default you should extend each ActiveRecord model manually by including TranslateEnum module in it. You can extend ActiveRecord by requiring translate_enum/active_record in initializer or inside yout Gemfile:

Gemfile:

gem 'translate_enum', require: 'translate_enum/active_record'

Initializer:

# config/initializers/translate_enum.rb
require 'translate_enum/active_record'

Advanced options

class User < ActiveRecord::Base
  enum gender: [:male, :female]
  
  translate_enum :gender do |tr|
    tr.i18n_scope = 'activerecord.attributes'
    tr.i18n_key = 'gender_list'
    tr.enum_klass_method_name = 'genders'
    tr.enum_instance_method_name = 'gender'
    tr.method_name_singular = 'translated_gender'
    tr.method_name_plural = 'translated_genders'
  end
  
  # Or even provide your own logic
  def self.translated_gender(key)
    I18n.t(key, scope: 'global.gender_list')
  end
end

How To?

How to use pluralization

en:
  activerecord:
    attributes:
      person:
        gender_list:
          male: 
            zero: No males
            one: One male
            other: %{count} males
            

Person.translated_gender(:make, count: 0) #=> "No males"
Person.translated_genders => [["One male", :male, 0]] # and others
Person.translated_genders(count: 0) => [["No males", :male, 0]] # and others

@person = Person.new(gender: :male)
@person.translated_gender #=> "One male"
@person.translated_gender(count: 10) #=> "10 Males"

How use translate enum in serializer

Example for Grape:

class Feedback < ApplicationRecord
  include TranslateEnum
  
  enum topic: {
    question: 'question', issue: 'issue', complaint: 'complaint', offer: 'offer',
    investment: 'investment'
  }

  translate_enum :topic
end

class FeedbacksApi < Grape::API
  resource :feedbacks do
    get 'enums' do
      present Feedback.method(:translated_topics), with: TranslateEnumSerializer
    end
  end
end

class TranslateEnumSerializer < Grape::Entity
  expose :enum, as: ->(method) { method.name[/translated_(.*)/, 1] } do |method|
    method.call.map do |translation, key, _value|
      { value: key, translation: translation }
    end
  end
end

curl http://localhost:3000/feedbacks/enums

{
  "topics": [
    {
      "value": "question",
      "translation": "Vopros"
    },
    {
      "value": "issue",
      "translation": "Problema"
    },
    {
      "value": "complaint",
      "translation": "Zhaloba"
    },
    {
      "value": "offer",
      "translation": "Predlozhenie"
    },
    {
      "value": "investment",
      "translation": "Invisticii"
    }
  ]
}