staging.rb

require File.expand_path("../production.rb", __FILE__)

RailsAppName::Application.configure do
  config.middleware.insert_after(::Rack::Lock, "::Rack::Auth::Basic", "Staging") do |u, p|
    [u, p] == [ENV['STAGING_USERNAME'], ENV['STAGING_PASSWORD']]
  end

  config.action_mailer.default_url_options = { :host => 'some-app.herokuapp.com' }
  config.action_mailer.asset_host = ""
end