Hi all,

I have been hit by this issue too a few years back, so I think I should 
contribute. First, I18n has been a first class citizen since Rails 2.2 
(http://weblog.rubyonrails.org/2008/11/18/new-rails-2-2-i18n-defaults), so 
I would not be so quick to dismiss the problem because a minority of apps 
use the feature.

So the main question is: "shouldn't locale be included by default into 
cache key?"

One important thing to keep in mind: Rails cache can store HTML snippets 
(for which having the locale in the key would help), but can also be used 
to store other, non-i18n data (for which a key without the locale is fine). 
So let's look at what happens with and without locale in the default key 
namespace in these two use cases, when a developer adds I18n to his app:

1) Without locale in the default key namespace (current behavior)
  non-i18n data: works fine
  HTML: breaks, developer wastes time tracking the problem, and ends up 
adding locale to the key manually

2) With locale in the default key namespace
  non-i18n data: extra, unneeded cache miss per locale, but still works fine
  HTML: works fine out of the box.

Looking at it this way, it seems obvious to me that 2) should be the 
default behavior, since it works fine out of the box in both cases. And if 
you are worried about the performance impact of the extra cache misses for 
non-i18n data, they I'll wager back in the "a small minority of apps need 
localization", meaning most apps won't be affected at all.

So, +1 to including the locale in the default key namespace.



On Tuesday, 15 September 2015 02:56:20 UTC+9, Kir Shatrov wrote:
>
> I don't think that it should be included by default, since a small 
> minority of apps need localization (
> https://github.com/rails/rails/pull/21124#issuecomment-127995334).
>
> The best thing we can do for it - introduce the `default_key_scope` method 
> for Rails cache, and in this case you'd be able to set the prefix for all 
> cache keys.
>
> On Friday, September 11, 2015 at 12:52:58 AM UTC+3, Anthon Mur wrote:
>>
>> fix: Hence, shouldn't local*e* be included by default into cache key?
>>
>>

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