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# encoding: utf-8
# I18n locale fallbacks are useful when you want your application to use
# translations from other locales when translations for the current locale are
# missing. E.g. you might want to use :en translations when translations in
# your applications main locale :de are missing.
#
# To enable locale fallbacks you can simply include the Fallbacks module to
# the Simple backend - or whatever other backend you are using:
#
# I18n::Backend::Simple.send(:include, I18n::Backend::Fallbacks)
module I18n
@@fallbacks = nil
class << self
# Returns the current fallbacks implementation. Defaults to +I18n::Locale::Fallbacks+.
def fallbacks
@@fallbacks ||= I18n::Locale::Fallbacks.new
end
# Sets the current fallbacks implementation. Use this to set a different fallbacks implementation.
def fallbacks=(fallbacks)
@@fallbacks = fallbacks
end
end
module Backend
module Fallbacks
# Overwrites the Base backend translate method so that it will try each
# locale given by I18n.fallbacks for the given locale. E.g. for the
# locale :"de-DE" it might try the locales :"de-DE", :de and :en
# (depends on the fallbacks implementation) until it finds a result with
# the given options. If it does not find any result for any of the
# locales it will then raise a MissingTranslationData exception as
# usual.
#
# The default option takes precedence over fallback locales, i.e. it
# will first evaluate a given default option before falling back to
# another locale.
def translate(locale, key, options = {})
I18n.fallbacks[locale].each do |fallback|
begin
result = super(fallback, key, options) and return result
rescue I18n::MissingTranslationData
end
end
raise(I18n::MissingTranslationData.new(locale, key, options))
end
end
end
end
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