我是一个Ruby on Rails新手，按照网上的入门教程去练习，然后进行到5.7章节(网址在这里)的时候出现NoMethodError错误，我后来上网搜索解决方案，依然没有成功解决，我是按照这个教程一步一步练习的。
下面是我代码和错误信息的截图
后来我问身边的朋友，他们说是版本问题，我Ruby版本是2.2.3，Rails是5.0.0，不过如何解决这个错误，希望有专业高手帮我解答，多谢！
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Your show action is defined under private, and the view layer cannot get your variables
The index action under your DropsControler is defined after the private keyword, so it is a private method, so you cannot get the show action when rendering the view, so noMethodError is displayed
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Your show action is defined under private, and the view layer cannot get your variables
The index action under your DropsControler is defined after the private keyword, so it is a private method, so you cannot get the show action when rendering the view, so noMethodError is displayed