cookies.permanent[:auth_token] = user.auth_token 

和

    cookies[:auth_token] = user.auth_token

在铁轨上？

如何设置Cookie，该cookie会在浏览器（如会话）关闭后立即失效？

我的会话控制器：

   class SessionsController < ApplicationController
    def new
    end

    def create
      user = User.find_by_email(params[:email])
      if user && user.authenticate(params[:password])

        if params[:remember_me]
          cookies.permanent[:auth_token] = user.auth_token
        else
           cookies[:auth_token] = user.auth_token
        end 
        redirect_to user
        flash[:success] = 'Logged in successfully.'

      else
        render 'new'
      end
    end


   def destroy
       @current_user = nil
       cookies[:auth_token] = nil
       reset_session
       redirect_to root_path
   end

end