Rails MVC 和 CRUD(12)

franket

发布于 2021-11-25 08:21:19

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代码可运行

文章被收录于专栏：技术杂记技术杂记

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代码可运行

在model中添加了基础的校验逻辑，title 字段不能为空，不能小于5个字符

保存成功就直接显示，如果保存失败，就重绘 new 页面，new 页面中加入了对错误信息的显示

并且将之前的值放到新的窗口中，要求继续输入，准备重新提交

更新文章

定义 edit 方法，并且创建 edit 视图

[root@h202 blog]# vim app/controllers/articles_controller.rb 
[root@h202 blog]# cat app/controllers/articles_controller.rb 
class ArticlesController < ApplicationController
  def new
    @article = Article.new
  end
  def edit
    @article = Article.find(params[:id])
  end
  def create
#    render plain: params[:article].inspect
#    @article = Article.new(params[:article])
     @article = Article.new(article_params)
     
     if @article.save
       redirect_to @article
     else
       render 'new'
     end
  end
  def show
    @article = Article.find(params[:id])
  end
  def index
    @articles = Article.all
  end
  private
    def article_params
        params.require(:article).permit(:title,:text)
    end
end
[root@h202 blog]# vim app/views/articles/edit.html.erb
[root@h202 blog]# cat app/views/articles/edit.html.erb
<h1>Editing article</h1>
 
<%= form_for :article, url: article_path(@article), method: :patch do |f| %>
  <% if @article.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@article.errors.count, "error") %> prohibited
      this article from being saved:</h2>
    <ul>
    <% @article.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
    </ul>
  </div>
  <% end %>
  <p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
  </p>
 
  <p>
    <%= f.label :text %><br>
    <%= f.text_area :text %>
  </p>
 
  <p>
    <%= f.submit %>
  </p>
<% end %>
 
<%= link_to 'Back', articles_path %>
[root@h202 blog]#