Ruby On Rails的一個簡單例項
阿新 • • 發佈：2019-02-11
DB： MySQL
安裝ROR環境：
Rails： gem install rails --include-dependencies
新建資料庫blogs,並執行以下SQL文建表。
/*
MySQL Data TransferSource Host: localhostSource Database: blogsTarget Host: localhostTarget Database: blogsDate: 2008/04/09 9:43:11
*/
SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for comments-- ----------------------------CREATETABLE `comments` ( `id` int(11) NOTNULL auto_increment, `body` text, `post_id` int(11) defaultNULL, PRIMARYKEY (`id`)) ENGINE=MyISAM AUTO_INCREMENT=6DEFAULT CHARSET=utf8;-- ------------------------------ Table structure for posts-- ----------------------------CREATETABLE `posts` ( `id` int(11) NOTNULL auto_increment, `title` varchar(255) defaultNULL, `created_at` datetimedefaultNULL, `body` text, PRIMARYKEY (`id`)) ENGINE=MyISAM AUTO_INCREMENT=3DEFAULT CHARSET=utf8;-- ------------------------------ Records -- ----------------------------INSERTINTO `comments` INSERTINTO `comments` VALUES ('2', 'bbb', '2');INSERTINTO `comments` VALUES ('3', 'ddd', '2');INSERTINTO `comments` VALUES ('4', '', '1');INSERTINTO `comments` VALUES ('5', 'aaa', '1');INSERTINTO `posts` VALUES ('1', 'a', '2008-04-08 18:18:00', 'a');INSERTINTO `posts` VALUES ('2', 'b', '2008-04-08 18:19:00', 'b');
新建Rails工程（工程名暫定為：rorblog）。修改資料庫配置檔案如下圖：
目錄結構：（可以使用IDE的Generators生成control及model元件）
程式碼：
blog_controller.rb
class BlogController < ApplicationController def index list render :action =>'list' end # GETs should be safe (see http://www.w3.org/2001/tag/doc/whenToUseGet.html) verify :method => :post, :only => [ :destroy, :create, :update ], :redirect_to => { :action => :list } def list # @post_pages, @posts = paginate :posts, :per_page => 10 @post = Post.find(:all) end def show @post = Post.find(params[:id]) end def new @post = Post.new end def create @post = Post.new(params[:post]) if @post.save flash[:notice] ='Post was successfully created.' redirect_to :action =>'list' else render :action =>'new' end end def edit @post = Post.find(params[:id]) end def update @post = Post.find(params[:id]) if @post.update_attributes(params[:post]) flash[:notice] ='Post was successfully updated.' redirect_to :action =>'show', :id => @post else render :action =>'edit' end end def destroy Post.find(params[:id]).destroy redirect_to :action =>'list' end def comment Post.find(params[:id]).comments.create(params[:comment]) flash[:notice] ="Add Your Comments" redirect_to(:action =>"show", :id => params[:id]) end end
blog_helper.rb
module BlogHelperend
comment.rb
class Comment < ActiveRecord::Baseend
post.rb
class Post < ActiveRecord::Base validates_presence_of :title has_many :comments end
list.rhtml
<h1>My Wonderful WebBolg</h1><%= render :partial =>"post", :collection => @post.reverse %><%= link_to 'New post', :action => 'new' %>
new.rhtml
<h1>New post</h1><%= form_tag :action =>'create'%> <%= render :partial =>'form'%> <%= submit_tag "Create"%><%= form_tag %><%= link_to 'Back', :action =>'list'%>
edit.rhtml
<h1>Editing post</h1><%= form_tag :action =>'update', :id => @post %> <%= render :partial=>'form'%> <%= submit_tag 'Edit'%><%= form_tag %><%= link_to 'Show', :action =>'show', :id => @post %>|<%= link_to 'Back', :action =>'list'%>
show.rhtml
<%= render :partial =>"post", :object => @post %><%= link_to 'Edit', :action =>'edit', :id => @post %>|<%= link_to 'Back', :action =>'list'%><h2>Comments</h2><%for comment in @post.comments %> <%= comment.body %> <hr/><% end %><%= form_tag :action =>"comment", :id => @post %> <%= text_area "comment", "body"%></br> <%= submit_tag "Comment!"%></form>
_form.rhtml
<%= error_messages_for 'post'%><!--[form:post]--><p><label for="post_title">Title</label><br/><%= text_field 'post', 'title'%></p><p><label for="post_created_at">Created at</label><br/><%= datetime_select 'post', 'created_at'%></p><p><label for="post_body">Body</label><br/><%= text_area 'post', 'body'%></p><!--[eoform:post]-->
_post.rhtml
<div> <h2><%= link_to post.title, :action =>'show', :id => post %></h2> <p><%= post.body %></p> <p><small> <%= post.created_at.to_s(:long) %> (<%= link_to 'Edit', :action =>'edit', :id => post %>) </small></p> </div>
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