无法在 ruby​​ on rails 控制器中设置/使用会话变量

谁能告诉我在 ruby​​ on rails 应用程序中从头开始设置/使用会话变量的正确方法.我无法在两个页面之间的控制器中设置/使用会话变量.我正在使用 CookieStore 会话类型.这是用于设置和获取会话变量的语法:

Can somebody tell me the right way to set/use session variables in a ruby on rails application from scratch. I am not able to set/use a session variable in my controller between two pages. I am using CookieStore session type. This is the syntax being used to set and get session variables:

session[:test] = "testing"

@test_str = session[:test]

如果我遗漏了什么，请告诉我.

Let me know in case I am missing on something.

这是我的控制器的样子:

This is how my controller looks like:

class PaymentsController < ApplicationController

  # GET /merchant_test  
  def merchant_test
    session[:test] = "testing"
    render :layout => false 
  end

  # POST /post_to_mobikwik
  def post_to_mobikwik
    zr = Mobikwik::Request.new(params) 
    @mobikwik_data = zr.all_params
    @test_str = session[:test]
    render :layout => false    
  end

  # POST /z_response
  def z_response
    zr = Mobikwik::Response.new(request.raw_post)  
    @checksum_check = zr.valid?
    @mobikwik_post = zr.all_params
    @statuscode = @mobikwik_post['statuscode']
    @statusmessage = @mobikwik_post['statusmessage']
    if @statuscode == "0"
       @verified = zr.verified?
    else
       @verified = false
    end
    render :layout => false
  end