Backend that chains multiple other backends and checks each of them when a translation needs to be looked up. This is useful when you want to use standard translations with a Simple backend but store custom application translations in a database or other backends.

To use the Chain backend instantiate it and set it to the I18n module. You can add chained backends through the initializer or backends accessor:

# preserves the existing Simple backend set to I18n.backend
I18n.backend = I18n::Backend::Chain.new(I18n::Backend::ActiveRecord.new, I18n.backend)

The implementation assumes that all backends added to the Chain implement a lookup method with the same API as Simple backend does.

Methods
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Included Modules
Attributes
[RW] backends
Class Public methods
new(*backends)
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 23
def initialize(*backends)
  self.backends = backends
end
Instance Public methods
available_locales()
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 35
def available_locales
  backends.map { |backend| backend.available_locales }.flatten.uniq
end
localize(locale, object, format = :default, options = {})
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 60
def localize(locale, object, format = :default, options = {})
  backends.each do |backend|
    begin
      result = backend.localize(locale, object, format, options) and return result
    rescue MissingTranslationData
    end
  end
  raise(I18n::MissingTranslationData.new(locale, format, options))
end
reload!()
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 27
def reload!
  backends.each { |backend| backend.reload! }
end
store_translations(locale, data, options = {})
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 31
def store_translations(locale, data, options = {})
  backends.first.store_translations(locale, data, options = {})
end
translate(locale, key, options = {})
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 39
def translate(locale, key, options = {})
  return key.map { |k| translate(locale, k, options) } if key.is_a?(Array)
  default = options.delete(:default)
  namespace = {}
  backends.each do |backend|
    begin
      options.update(:default => default) if default and backend == backends.last
      translation = backend.translate(locale, key, options)
      if namespace_lookup?(translation, options)
        namespace.update(translation)
      elsif !translation.nil?
        return translation
      end
    rescue MissingTranslationData
    end
  end
  return namespace unless namespace.empty?
  raise(I18n::MissingTranslationData.new(locale, key, options))
end
Instance Protected methods
namespace_lookup?(result, options)
# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/chain.rb, line 71
def namespace_lookup?(result, options)
  result.is_a?(Hash) and not options.has_key?(:count)
end