在ArticlesController＃show中的ActiveRecord :: RecordNotFound找不到带有'id'= edit的文章

Question

当我进入文章/编辑时，我收到了一个错误。

我收到此错误：

当我收到此错误时：

我的代码：

articles_controller：

class ArticlesController < ApplicationController

  def new
    @article = Article.new 
  end

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

  def create
    @article = Article.new(article_params)
    if @article.save
      flash[:notice] = "Article was submitted succsefully"
      redirect_to (@article)
    else
      render :new
    end 
  end

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

  private 
  def article_params 
    params.require(:article).permit(:title, :description)
  end
end 

我的edit.html.erb：

<h1>Edit the existing article</h1>
<% if @article.errors.any? %>
<h2>The following errors are informing you that if you don't do these then 
your articles will not be edited</h2>
  <ul>
    <% @article.errors.full_messages.each do |msg| %>
      <li> <%= msg %> </li>
    <% end %>
  </ul>
<% end %>
<%= form_for @article do |f| %>
  <p>
    <%= f.label :title %>
    <%= f.text_field:title %>
  </p>
  <p>
    <%= f.label :description  %>
    <%= f.text_area :description %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

我的new.html.erb：

<h1>Create an article</h1>
<% if @article.errors.any? %>
<h2>The following errors are informing you that if you don't do these then 
your articles will not be created</h2>
  <ul>
    <% @article.errors.full_messages.each do |msg| %>
      <li> <%= msg %> </li>
    <% end %>
  </ul>
<% end %>
<%= form_for @article do |f| %>
  <p>
    <%= f.label :title %>
    <%= f.text_field:title %>
  </p>
  <p>
    <%= f.label :description  %>
    <%= f.text_area :description %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

my routes.rb：

resources :articles
root 'pages#home'
get 'about', to: 'pages#about'

如果有帮助，请向我询问更多文件

Answer 1

那就是错误的原因。 “编辑”页面需要一个id参数。在你的控制器中：

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

需要params[:id]

因此您需要使用/articles/id/edit（将id替换为您的实际ID）

Answer 2

resources :articles将创建一个edit_article_path帮助程序，您应该用它来链接到编辑操作：

<%= link_to("Edit article", edit_article_path(@article)) %>

这将使用:id细分创建正确的路径：

      Prefix Verb   URI Pattern                  Controller#Action
    articles GET    /articles(.:format)          articles#index
             POST   /articles(.:format)          articles#create
 new_article GET    /articles/new(.:format)      articles#new
edit_article GET    /articles/:id/edit(.:format) articles#edit
     article GET    /articles/:id(.:format)      articles#show
             PATCH  /articles/:id(.:format)      articles#update
             PUT    /articles/:id(.:format)      articles#update
             DELETE /articles/:id(.:format)      articles#destroy