Configuring Rails 3 Plugin

development.rb

config.action_mailer.raise_delivery_errors = true
config.action_mailer.default_url_options = { :host => 'localhost:3000' }  
config.action_mailer.perform_deliveries = false
config.action_mailer.default :charset => "utf-8"
    
config.active_support.deprecation = :log
    
config.mongo_fifo = MongoFifo::Store.new(Mongo::Connection.new['mongo_fifo'])

initializer.rb

initializer "mongo_fifo.configure_mongodb_connection" do |app|
  unless defined?(FIFO_CACHE)
    silence_warnings { Object.const_set "FIFO_CACHE", app.config.mongo_fifo }
  end
end

mongo_fifo.rb

module MongoFifo
  class Railtie < Rails::Railtie
    config.mongo_fifo = ActiveSupport::OrderedOptions.new
  end
end