i18n_strategy

i18n_strategy provides a very much simple way to detect and set locale in your Rails application.

In i18n section of Rails Guide, there's a description on Rails i18n API. It's comprehensive and has enough information to implement our own locale detection strategy. However, it doesn't provide us some automatic way to handle users' locale.

I've wanted some easier way to handle it. So I hacked up this library which provides a thin wrapper over Rails i18n API and allows you to detect and set request users' locale easily.

Add a line below into your Gemfile:

gem 'i18n_strategy'

Then, set your custom strategy into I18nStrategy.strategy, which is to detect a locale for a user visiting your application, and also set available languages in your application via I18nStrategy.available_locales.

initializers/i18n_strategy:

# Just for example
module MyStrategy
  def detect_locale
    if params[:local] && I18nStrategy.available_locales.include?(params[:locale])
      params[:locale]
    else
      I18n.default_locale
    end
  end
end

I18nStrategy.strategy = MyStrategy
I18nStrategy.available_locales = %w[ja en]

Users' locale detected by the strategy is automatically set to I18n.locale.

That's all. Very much simple.

Set your own custom strategy module via this method. If not set, default strategy will be used.

The module must implement detect_locale method or some other one set by I18nStrategy.method_to_detect_locale method described below.

Set another method instead of default one, detect_locale.

The method to be used to detect users' locale will be called as a instance method of a controller which is currently dispatched. That is to say, it can duplicate your existing method.

In case above, you can set another method name to be called via this method.

Set available locales in your application.

The default strategy utilizes this method to detect whether the language from users can be available in your application or not.

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