Traco

Translatable columns for Ruby on Rails, stored in the model table itself.

Description

Translatable attributes for Ruby on Rails, stored in the model table itself.

Inspired by Iain Hecker's translatable_columns.

To store translations outside the model, see Sven Fuchs' Globalize.

Monthly Downloads: 6,332

Programming language: Ruby

License: MIT License

Tags: Internationalization     Active Record     Translation    

Latest version: v5.0.0

README

Traco

Translatable attributes for Ruby on Rails 4.2+, stored in the model table itself.

Inspired by Iain Hecker's translatable_columns.

To store translations outside the model, see Sven Fuchs' Globalize.

Usage

Say you want Post#title and Post#body to support both English and Swedish values.

Write a migration to get database columns with locale suffixes, e.g. title_sv and title_en, like:

class CreatePosts < ActiveRecord::Migration
  def change
    create_table :posts do |t|
      t.string :title_sv, :title_en
      t.text :body_sv, :body_en

      t.timestamps
    end
  end
end

Don't create a database column named title without a suffix, since Traco will define a method with that name.

If you use a locale format like pt-BR, the column name would be title_pt_br.

Declare the attributes in the model:

class Post < ActiveRecord::Base
  translates :title, :body
end

You can still use your accessors like title_sv and title_sv= in forms, validations and other code, but you also get:

#title: Shows the title in the current locale. If blank, falls back to default locale. Otherwise nil.

#title=: Assigns the title to the column for the current locale, if present. Raises if the column doesn't exist.

#title?: Is the title present? Respects the Traco fallback setting.

.human_attribute_name(:title_sv): Extends this standard method to return "Title (Swedish)" if you have a translation key i18n.languages.sv = "Swedish" and "Title (SV)" otherwise. Rails uses this method to build validation error messages and form labels.

.translatable_attributes: Returns an array like [:title, :body].

.locale_columns(:title): Returns an array like [:title_sv, :title_en] sorted with current locale first, then default locale, and then alphabetically. Suitable for looping in forms:

<% Post.locale_columns(:title).each do |column| %>
  <p>
    <%= form.label column %>
    <%= form.text_field column %>
  </p>
<% end %>

Or perhaps for things like:

attr_accessible *locale_columns(:title)

validates *locale_columns(:title), :uniqueness => true

You can also pass multiple attributes if you like:

attr_accessible *locale_columns(:title, :body)

The return value will be sorted like [:title_sv, :title_en, :body_sv, :body_en].

.current_locale_column(:title): Returns :title_sv if :sv is the current locale. Suitable for some SQL queries, such as sorting.

.locales_for_attribute(:title): Returns an array like [:sv, :en] sorted with current locale first, then default locale, and then alphabetically.

And the equivalent methods for body, of course.

Please note that your translates :title, :body declaration must be called before you call locale_columns. Otherwise you will get an error like "NoMethodError: undefined method `locale_columns' for #<Class:0x00000003f69188>".

Fallbacks

By default, Traco will fall back to the default locale if there is no translation in the current locale.

You can specify e.g. translates :title, fallback: false to never fall back and instead return nil.

You can specify e.g. translates :title, fallback: :any to fall back first to the default locale, then to any other locale.

You can specify e.g. translates :title, fallback: [:sv] to explicitly declare fallbacks as an array of any length.

You can specify e.g. translates :title, fallback: :i18n to use the fallbacks from I18n.fallbacks.

You can override the default fallback strategy with a parameter passed to the reader: post.title(fallback: :any).

If you need to declare the default locale fallback, do post.title(fallback: :default).

Overriding methods

Methods are defined in an included module, so you can just override them and call Traco's implementation with super:

class Post < ActiveRecord::Base
  translates :title

  def title
    super.reverse
  end
end

Installation

Add this to your Gemfile:

gem "traco"

Then run

bundle

to install it.

Running the tests

bundle
rake

Benchmark

ruby benchmarks/overhead.rb

<!-- Keeping this a hidden brain dump for now.

TODO

We've intentionally kept this simple with no features we do not need. We'd be happy to merge additional features that others contribute.

Possible improvements to make:

• Validation that checks that at least one translation for a column exists.
• Validation that checks that every translation for a column exists.
• Scopes like translated, translated_to(locale).
• Support for region locales, like en-US and en-GB.

-->

Contributors

• Henrik Nyh
• Andrii Malyshko
• Tobias Bohwalli
• Mario Alberto Chavez
• Philip Arndt
• PikachuEXE
• Fernando Morgenstern
• Tomáš Horáček
• Joakim Kolsjö

License

[MIT](LICENSE.txt)