Set Redis as I18n Cache in Rails

i18n_redis

### Gemfile
gem 'redis', '~> 3.0.2'
gem 'redis-rails', '~> 3.2.3'


### as initializer or in application.rb
$redis = Redis.new(:host => 'localhost', :port => 6379)

# delete all i18n keys before so they will be reloaded
$redis.keys.find_all{|k| k.start_with? "i18n"}.each {|k| $redis.del k}

# set cache store to redis
YOURAPP::Application.config.cache_store = :redis_store, $redis.id

# set I18n cache
I18n::Backend::Simple.send(:include, I18n::Backend::Cache)
I18n.cache_store = ActiveSupport::Cache.lookup_store(:redis_store)

### 
# now you can test with 2 rails consoles and/or rails server
# first console:
# displays all commands that are send to redis
$redis.monitor {|b| p b}

# second console (or load a page with rails server)
# you will see the get/set commands in the first console
$redis.keys # => []
I18n.t "welcome" # => "Welcome"
$redis.keys # => ["i18n/en/..."]

Thanks for sharing.

One note if you are chaining backends you need to setup the cache on the chain.
I18n::Backend::Chain.send(:include, I18n::Backend::Cache)

👍