ruby on rails错误undefined method `title' for nil:NilClass

来源：互联网发布：淘宝插件哪个好用编辑：程序博客网时间：2024/05/22 14:28

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

我的出错的代码如下：

controlle

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

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文件里：

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

把show方法改成公有的就好啦

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