module I18n::Backend::Fallbacks

Public Instance Methods

exists?(locale, key) click to toggle source
Calls superclass method
# File lib/i18n/backend/fallbacks.rb, line 71
def exists?(locale, key)
  I18n.fallbacks[locale].each do |fallback|
    begin
      return true if super(fallback, key)
    rescue I18n::InvalidLocale
      # we do nothing when the locale is invalid, as this is a fallback anyways.
    end
  end

  false
end
extract_non_symbol_default!(options) click to toggle source
# File lib/i18n/backend/fallbacks.rb, line 62
def extract_non_symbol_default!(options)
  defaults = [options[:default]].flatten
  first_non_symbol_default = defaults.detect{|default| !default.is_a?(Symbol)}
  if first_non_symbol_default
    options[:default] = defaults[0, defaults.index(first_non_symbol_default)]
  end
  return first_non_symbol_default
end
translate(locale, key, options = EMPTY_HASH) click to toggle source

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 throw MissingTranslation as usual.

The default option takes precedence over fallback locales only when it's a Symbol. When the default contains a String, Proc or Hash it is evaluated last after all the fallback locales have been tried.

Calls superclass method
# File lib/i18n/backend/fallbacks.rb, line 39
def translate(locale, key, options = EMPTY_HASH)
  return super unless options.fetch(:fallback, true)
  return super if options[:fallback_in_progress]
  default = extract_non_symbol_default!(options) if options[:default]

  fallback_options = options.merge(:fallback_in_progress => true)
  I18n.fallbacks[locale].each do |fallback|
    begin
      catch(:exception) do
        result = super(fallback, key, fallback_options)
        return result unless result.nil?
      end
    rescue I18n::InvalidLocale
      # we do nothing when the locale is invalid, as this is a fallback anyways.
    end
  end

  return if options.key?(:default) && options[:default].nil?

  return super(locale, nil, options.merge(:default => default)) if default
  throw(:exception, I18n::MissingTranslation.new(locale, key, options))
end