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# encoding: utf-8
module I18n
module Backend
# 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.
class Chain < Simple
attr_accessor :backends
def initialize(*backends)
self.backends = backends
end
def reload!
backends.each { |backend| backend.reload! }
end
def store_translations(locale, data, options = {})
backends.first.store_translations(locale, data, options = {})
end
def available_locales
backends.map { |backend| backend.available_locales }.flatten.uniq
end
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
return translation
end
rescue MissingTranslationData
end
end
return namespace unless namespace.empty?
raise(I18n::MissingTranslationData.new(locale, key, options))
end
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 and nil
end
protected
def namespace_lookup?(result, options)
result.is_a?(Hash) and not options.has_key?(:count)
end
end
end
end
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