Tutorial :How to localize a Rails plugin?



Question:

I'd like to translate the OpenIdAuthentication plugin into another language but I'd like not to change the plugin directly.

Here's the basic structure of the messages I want to translate:

module OpenIdAuthentication      class Result      ERROR_MESSAGES = {        :missing      => "Sorry, the OpenID server couldn't be found",        :invalid      => "Sorry, but this does not appear to be a valid OpenID",        :canceled     => "OpenID verification was canceled",        :failed       => "OpenID verification failed",        :setup_needed => "OpenID verification needs setup"      }     end    end

It is something possible to translate them without changing the plugin directly?

Thanks!


Solution:1

You can simply overwrite OpenIdAuthentication::Result::ERROR_MESSAGES by redefining it at any time after the plugin loads.

You may do so through a different plugin (that loads after OpenIdAuthentication), or from a file required after the plugin loads (e.g. require lib/open_id_authentication_suppl.rb in environment.rb):

The code will essentially be a copy-paste job, as follows:

module OpenIdAuthentication      class Result      ERROR_MESSAGES = {        :missing      => "<message in foreign language>",        :invalid      => "<message in foreign language>",        :canceled     => "<message in foreign language>",        :failed       => "<message in foreign language>",        :setup_needed => "<message in foreign language>"      }     end  

To integrate this with I18N-rails (built into Rails 2.2.2, available as a gem/plugin in previous versions), do:

  class I18NResultMessages      def [](key)        I18n.t(key, :scope => 'openidauthentication.errors.messages')      end    end      class Result      ERROR_MESSAGES = I18NResultMessages.new    end  

Then define and load your I18n yml file for openidauthentication.errors.messages's various locales on Rails startup, and don't forget to set your I18n.locale every time you start processing a controller action based on the logged-in user's locale.


Solution:2

Copy that code into a file in /lib, then require it in environment.rb. It really is that easy.


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