Exports $app/config/locale/$locale.yml contents to mongodb database

locale.rb

# usage:
# bundle exec rake locale:file RAILS_ENV=production
# if you want to export a different locale (not en.yml), provide locale option, as follows:
# bundle exec rake locale:file RAILS_ENV=production locale=ru

require 'mongo-i18n'

def write_to_database(sc, path, value)
  key = path.join('.')
  sc[key] = value.to_json
end

# traverse through hash
def traverse(sc, obj, path)
  case obj
  when Hash
    obj.each do |k,v| 
      traverse(sc, v, path + [k]) 
    end
  when Array
    obj.each {|v| traverse(sc, v) }
  else # end values
    write_to_database(sc, path, obj)
  end
end

namespace :locale do
  desc <<-eos
    Exports $app/config/locale/$locale.yml contents to mongodb database. 
    If locale is not specified, default (en) locale file will be exported.
  eos
  task :file do
    locale = ENV['locale'] || "en"
    environment = ENV['RAILS_ENV']   || "development"
    # I keep mongodb connection descriptor in config/mongodb.yml
    config = YAML::load(File.read(Rails.root.join('config/mongodb.yml')))
    collection = Mongo::Connection.new[config["development"]["database"]].collection('i18n')
    store = MongoI18n::Store.new(collection)
    
    dump = YAML::load(File.open(Rails.root.join("config","locales", "#{locale}.yml")))

    traverse(store, dump, [])
  end
end