Don't include default_locale in list of fallbacks

[kirahowe]

Hi everyone,

Is it currently possible to not include the default locale in the list of fallbacks? I'm working on a Rails app and right now I have this in my app config:

config.i18n.fallbacks = {'en-CA' => 'en',
                         'en-US' => 'en',
                         'fr-CA' => 'fr',
                         'ja-JP' => 'ja'}
config.default_locale = 'en-CA'

But the the fallback for 'fr-CA' is actually:

[
    [0] :"fr-CA",
    [1] :fr,
    [2] :"en-CA",
    [3] :en
]

I don't want en-CA or en to be there, because I want i18n to raise a MissingTranslationData exception so that I know where I have translations missing (actionview wraps these in a .translation-missing span which makes it easy to find the missing translations).

Is this currently possible? Or would it require a custom implementation of the Fallbacks class?

[ngan]

@kiramclean a possible solution is to set the default_locale to a dummy/empty locale:

config.i18n.default_locale = :empty

Then create the empty locale file (config/locales/empty.yml):

# This is purposefully empty so that this can be the final fallback locale. Since it's empty, anything hitting this locale would raise a MissingTranslationData exception.
empty:

[aesnyder]

I tried this and still found that I got an english translation instead of a missing translation exception.

[kirahowe]

@ngan The problem is I don't actually want the default_locale to be a dummy locale.. if I'm missing a translation in en-CA or en-US, for example, I still want the app to fall back to the actual default I set for those locales, but if I'm missing a translation in, say fr-CA, under no circumstances do I want the fallback to be en.

[ngan]

$  cat config/locales/dummy.yml 
dummy:

Then set fallbacks to true (instead of what you have)

config.i18n.fallbacks = true
config.i18n.default_locale = :dummy

Then either, specify all your available_locales:

config.i18n.available_locales = [:dummy, :en, :"en-CA", ...]

or just set config.i18n.enforce_available_locales = false.

Then the fallback logic will be automatic:

>> I18n.fallbacks[:"fr-CA"]
=> [:"fr-CA", :fr, :dummy]

>> I18n.fallbacks[:"en-CA"]
=> [:"en-CA", :en, :dummy]

>> I18n.t(:foo)
=> "translation missing: dummy.foo"

[ngan]

Just a tidbit:

>> I18n.fallbacks[:"en-CA-X1-X2-X3"]
=> [:"en-CA-X1-X2-X3", :"en-CA-X1-X2", :"en-CA-X1", :"en-CA", :en, :dummy]

[radar]

Thanks everyone. I think @ngan's workaround is great. If someone wants to submit a PR to fix this, then I'd be open to that.