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 < ApplicationController
def new
end
def create
params.permit!
@article = Article.new(params[:article])
@article.save
redirect_to @article
end
private
def article_params
params.required(:article).permit(:title, :text)
end
def show
@article = Article.find(params[:id])
end
end
<p> <strong>Title:</strong> <%= @article.title %> </p> <p> <strong>Text;</strong> <%= @article.text %> </p>
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 < ApplicationController
def new
end
def create
params.permit!
@article = Article.new(params[:article])
@article.save
redirect_to @article
end
def show
@article = Article.find(params[:id])
end
private
def article_params
params.required(:article).permit(:title, :text)
end
end
ruby on rails错误undefined method `title' for nil:NilClass,布布扣,bubuko.com
ruby on rails错误undefined method `title' for nil:NilClass
原文地址：http://blog.csdn.net/liu_chunhui/article/details/37928015
