Rails Scaffolding (Scaffold) feature

Scaffold is a fast-developing code framework for rails applications that enables CRUD operations with a single command.

1: Create an app

cd scaffoldapp rails s

Open Http://localhost:3000/in the browser

2: Create a scaffold named blog

Use Rails's scaffold to create templates that add, delete, modify, query (CRUD) operations.

rails g scaffold blog title:string content:textpicture:string

Database migration:

rakedb:migrate

Browser access: Http://localhost:3000/blogs

3: Add image upload function

can refer to my previous blog in rails to upload images using Carrierwave
Update Gemfile

‘carrierwavegenerate uploader Picture

Modify/APP/MODELS/BLOG.RB to mount picture properties

:picturePictureUploader

Open App/views/ideas/_form.html.erb and find this line:

<%= f.text_field :picture%>

Change it to:

<%= f.file_field :picture%>

And put this line:

<%= form_for(@blogdo%>

Change to:

<%= form_for(@blog,:html => {:multiparttruedo |f| %>

Open the App/views/ideas/show.html.erb and

<%=@blog.picture%>

Switch

<%= image_tag(@blog300if@blog.picture%>

4. Modify the Style

Open/APP/CONTROLLERS/BLOGS_CONTROLLER.RB
Create a new method

def list     @blogsBlog.all  end

Create a new List.html.erb under the/app/views/blogs/directory

<div class="Bgheader">    <H1>My Blog</H1></div><% @blogs.  each  do |blog| %>      <h2 class="Bgtitle"><%=link_to blog.title,blog%></H2>      <p><%= blog.content[0,]%></P><% End %>

Modify/CONFIG/ROUTES.RB, add:

‘blogs#list‘

Increase/app/assets/stylesheets/application.css

Body{  padding: 0px;     margin:0px;     width: +px;  margin:0 auto; }. Bgheader{  margin-top: -px;     height: px;  background-color: #E9F2E8; }. Bgheader H1{  color: #238A2A;     padding-top: px;  padding-left: px; }. Bgtitle a: Link,. Bgtitle a: Visited{  color: #0080FF;} #blog_title{  width:px;  height:px; }#blog_content{  width:480px;  height:px; }. Bgcontainer{  width: +px;} . Bgshow{  width: +px;} 

Modify/app/views/blogs/show.html.erb

<div class="Bgshow"><p id="notice"><%= Notice%></P><h2>  <%= @blog. Title%></H2>  <%= @blog. Content%><hr>  <%= Image_tag (@blog. Picture_url,: width = ) if @blog. picture.present?%><hr><%= link_to ' Edit ', Edit_blog_path (@blog)%> |<%= link_to ' back ', Blogs_path%> </div>

Effect

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Rails Scaffolding (Scaffold) feature