ActiveEnum i18n support patch

gistfile1.rb

# In your config/initializers/active_enum.rb
# @see https://github.com/adzap/active_enum/pull/4
# @example
#  * ja.yml
#   active_enum:
#     user:
#       sex:
#         male: '男性'
#         female: '女性'
#  * user.rb
#   class User < ActiveRecord::Base
#     class Sex < ActiveEnum::Base
#       value id: 0, name: 'male'
#       value id: 1, name: 'female'
#     end
#   end
#  User::Sex.tr_to_select
#    # => [['男性', 0], ['女性', 1]
#  User::Sex.translate('male')
#    # => '男性'
#  User::Sex.translate(1)
#    # => '女性'
#  User::Sex.t('famale')
#    # => '女性'
#  User.new(sex: 0).sex(:t)
#    # => '男性'
#  User.new(sex: 1).sex(:translation)
#    # => '女性'
module ActiveEnum
  class Base
    class << self
      def tr_to_select
        store.values.map do |v|
          translated = I18n.translate(v[1].downcase.gsub(/\s/, '_'), scope: i18n_scope, default: v[1])
          [translated, v[0]]
        end
      end

      def translate(index)
        if row = get_row(index)
          I18n.translate(row[1].downcase.gsub(/\s/, '_'), scope: i18n_scope)
        end
      end
      alias :t :translate

      protected

      def i18n_scope
        [:active_enum, self.name.underscore.gsub(/\//, '.')]
      end

      def get_row(index)
        if index.is_a?(Fixnum)
          store.get_by_id(index)
        else
          store.get_by_name(index)
        end
      end
    end
  end

  module Extensions
    module ClassMethods
      def define_active_enum_read_method(attribute)
        class_eval <<-DEF
          def #{attribute}(arg=nil)
            value = super()
            return if value.nil? && arg.nil?

            enum = self.class.active_enum_for(:#{attribute})
            case arg
            when :id
              value if enum[value]
            when :name
              enum[value]
            when :enum
              enum
            when :translation, :t
              enum.translate(value)
            when Symbol
              (enum.meta(value) || {})[arg]
            else
              #{ActiveEnum.use_name_as_value ? 'enum[value]' : 'value' }
            end
          end
        DEF
      end
    end
  end
end

ActiveEnumを使ってi18n対応させるためのパッチ