Debugging I18n lookup in Rails

January 31, 2015 · Miguel Parramón · blogger

Here’s a nice trick to debug I18n translation strings on Rails.

1. Add this to config/initializers/i18n.rb:

module I18n module Backend class Simple # Monkey-patch-in localization debugging # Enable with ENV[‘I18N_DEBUG’]=1 on the command line in server startup, or ./config/environments/*.rb file. # def lookup(locale, key, scope = [], options = {}) init_translations unless initialized? keys = I18n.normalize_keys(locale, key, scope, options[:separator])

    puts "I18N keys: #{keys}"

    keys.inject(translations) do |result, \_key|
      \_key = \_key.to\_sym
      return nil unless result.is\_a?(Hash) && result.has\_key?(\_key)
      result = result\[\_key\]
      result = resolve(locale, \_key, result, options.merge(:scope => nil)) if result.is\_a?(Symbol)

      puts "\\t\\t => " + result.to\_s + "\\n" if (result.class == String)

      result
    end
  end
end

end end if ENV[‘I18N_DEBUG’]

2. Call your server/test suite from the console with the environment variable I18N_DEBUG=1, and you’ll get this nice log of where Rails is looking for your translation strings:

$ I18N_DEBUG=1 rake test TEST=test/integration/frontend/sign_up_test.rb Run options: —seed 27950

Running tests:

I18N keys: [:sv, :frontend, :home, :index, :sign_in, :sign_in] => Logga in I18N keys: [:sv, :frontend, :home, :index, :sign_up, :facebook_connect] => Logga in med Facebook I18N keys: [:sv, :frontend, :home, :index, :sign_in, :or] => eller I18N keys: [:sv, :frontend, :home, :index, :sign_in, :email] => Email …

Finished tests in 2.280371s, 0.8771 tests/s, 3.5082 assertions/s.

2 tests, 8 assertions, 0 failures, 0 errors, 0 skips

I’m reposting this code (with some modifications) from here, since that link doesn’t seem to work most of the time.

There’s also another method explained in this blog post for logging all missing translations and fallbacks, which also seems very useful. Maybe I’ll try it next time :)

Have a nice day!

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