ActionView :: Template :: Error（nil：NilClass的未定義方法“標題”）

Question

我正在嘗試發表博客文章，並收到了Template :: Error。 我進行了搜索，我知道這是一個簡單的解決方法，但無法弄清楚。 我不知道自己缺少什么，因此非常感謝您的幫助。

articles_controller

  class ArticlesController < ApplicationController def new @article = Article.new end def create @article = Article.new(article_params) if @article.save flash[:success] = "Article was successfully created" redirect_to article_path(@article) else render 'new' end end def show end def edit end def update if @article.update(article_params) flash[:success] = "Article was updated" redirect_to article_path(!article) else flash[:success] = "Article was not updated" render 'edit' end end def index @articles = Article.all end def destroy @article.destroy flash[:success] = "Article was deleted" redirect_to articles_path end private def article_params params.require(:article).permit(:title, :description) end def set_article @article = Article.find(params[:id]) end end 

show.html.erb

<h2 align="center">Title: <%= @article.title %></h2>
<div class="well col-xs-8 col-xs-offset-2">
 <h4 class="center"><strong>Description:</strong></h4>
 <hr>
 <%= @article.description %>
<%= link_to "Edit", edit_article_path(@article) %> |
<%= link_to 'Back', articles_path %>

Answer 1

在show動作中設置@article ：

def show
  @article = Article.find(params[:id])
end 

或使用before_action回調：

class ArticlesController < ApplicationController
  before_action :set_article, only: :show

  ...
end