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    <p>Network traffic will always be slower than local work. You might consider an in-memory cache, and then just pull the current localization version on each request (or even just on a short timer) to determine whether to invalidate the cache. It looks like there's a Memoization module (per <a href="https://github.com/svenfuchs/i18n/blob/master/lib/i18n/backend/key_value.rb" rel="nofollow">the source here</a>) that you can just mix into an I18n interface. Then, we just tweak the <code>#lookup</code> method so that every 5 minutes, it checks Redis for an updated locale version, and ensures that it increments the locale version when new translations are saved.</p> <p>This gives you an in-memory cache of all your translations so it's a very fast lookup, while giving you the ability to make translation changes on-the-fly - your translations may take up to 5 minutes to update, but you don't have to do any explicit cache purging.</p> <p>If you wanted, you could make it do the check on every request with a <code>before_filter</code> rather than just using the lazy 5-minute expiration, which means more requests to redis, but you wouldn't see any stale translations.</p> <pre><code>module I18n module Backend class CachedKeyValueStore &lt; KeyValue include Memoize def store_translations(locale, data, options = {}) @store.incr "locale_version:#{locale}" reset_memoizations!(locale) super end def lookup(locale, key, scope = nil, options = {}) ensure_freshness(locale) flat_key = I18n::Backend::Flatten.normalize_flat_keys(locale, key, scope, options[:separator]).to_sym flat_hash = memoized_lookup[locale.to_sym] flat_hash.key?(flat_key) ? flat_hash[flat_key] : (flat_hash[flat_key] = super) end def ensure_freshness(locale) @last_check ||= 0 if @last_check &lt; 5.minutes.ago @last_check = Time.now current_version = @store.get "locale_version:#{locale}" if @last_version != current_version reset_memoizations! locale @last_version = current_version end end end end end end </code></pre> <p>I just hacked this up from reading the I18n source, and I haven't tested it at all, so it might need some work, but I think it communicates the idea well enough.</p>
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    1. CONifty. This is basically the solution I had in mind, only better. I wonder why no one else seems to have dealt with this?
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    2. COGist is up here: https://gist.github.com/wheeyls/5650947
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    3. CONice. I'm going to yoink this and stick it in my to-use-later pile. :)
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