How can I identify unused i18n keys?

Question

I\'m working on an existing Rails app and am using a localization file, en.yml, to hold most of the app\'s text. At the moment, we aren\'t localizing into any other

Answer 1

It's been many years since I first arrived to this question as I had the exact same problem. The problem hasn't grown smaller, I am more frustrated than ever.

Here is an experimental project, it hooks into the translate lookup and increments the translation key counter in Redis:

https://github.com/paladinsoftware/i18n-counter

The idea is that you can pull the stats and compare. (WIP for the moment, I would love help ofc)

You may ask: "won't that slow down the lookups?"

And you are right of course, but the overhead is hardly noticeable, check out this benchmark.

require 'benchmark'
n = 100000
Benchmark.bm do |x|
  x.report { ENV['ENABLE_I18N_COUNTER'] = 'true'; n.times do ; I18n.translate('application.contract_not_available.header'); end }
  x.report { ENV['ENABLE_I18N_COUNTER'] = 'false'; n.times do ; I18n.translate('application.contract_not_available.header'); end }
end

 ---------------------------------------------
| Benchmark  | Seconds   | Sec pr translation |
|------------| --------- | ------------------ |
| with redis | 48.280000 | 0.0004828          |
| without    |  9.010000 | 0.0000901          |
 ---------------------------------------------

The overhead being about 3 ms pr lookup. It boils down to the number of lookups you do per page/request.