首先搞清楚这句话，在 Ruby 中，方法分为 public、private 和 protected 三种，仅仅有 public 方法才干作为控制器的动作。

我的出错的代码例如以下：

controlle

class ArticlesController < ApplicationControllerdef new enddef createparams.permit!  @article = Article.new(params[:article])@article.saveredirect_to @articleendprivatedef article_paramsparams.required(:article).permit(:title, :text)enddef show @article = Article.find(params[:id])end
end

view show.html.erb

<p><strong>Title:</strong><%= @article.title %>
</p><p><strong>Text;</strong><%= @article.text %>
</p>

报错说是：

NoMethodError in Articles#show

Showing /home/huihui/Documents/ruby/blog/app/views/articles/show.html.erb where line #3 raised:

undefined method `title' for nil:NilClass

解决方法是：

在controlle文件中：

class ArticlesController < ApplicationControllerdef new enddef createparams.permit!  @article = Article.new(params[:article])@article.saveredirect_to @articleenddef show @article = Article.find(params[:id])endprivatedef article_paramsparams.required(:article).permit(:title, :text)end
end

把show方法改成公有的就好啦

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ruby on rails错误undefined method `title#39; for nil:NilClass

NoMethodError in Articles#show

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