Remember me, devise, and omniauth

This is how you do remember_me with Devise and Omniauthable, this is the OmniauthCallbacksController in one of my apps:

class OmniauthCallbacksController < Devise::OmniauthCallbacksController
  def facebook
    auth(:facebook)
  end

  def twitter
    auth(:twitter)
  end

protected
  def auth(provider)
    auth_hash = request.env['omniauth.auth']
    @user = User.find_for_omniauth(provider, auth_hash, current_user)

    if @user.persisted?
      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => provider
      @user.remember_me = true
      sign_in_and_redirect @user, :event => :authentication
    else
      session['devise.omniauth'] = auth_hash.except('extra')
      redirect_to new_user_registration_url
    end
  end
end