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使用sinatra实现简单的crud功能

2016-11-16 15:53 501 查看

Sinatra

gem install sinatra


hello_sinatra

mkdir -p hello_sinatra
cd hello_sinatra


vim hello_sinatra.rb

require "sinatra"
get "/" do
"Hello, world!"
end


然后

ruby hello_sinatra.rb

localhost:4567

修改hello_sinatra.rb

require "sinatra"
get "/post/:id" do
"Hello, world!参数是#{params}"
end


然后刷新页面，会发现，有报错，不生效。

Note that every time we change the Ruby file, we’ll need to restart the server

这样每次修改一下，不是很讨厌吗？？

shotgun可以避免这个问题。

gem install shotgun


然后启动的时候注意一下。

ruby hello_sinatra.rb -> shotgun hello_sinatra.rb


这个时候的端口，由4567改变成了9393

Creating a Basic Web App With Ruby and Sinatra

build sinatra app

mkdir pubic-bookmarks-sinatra
cd pubic-bookmarks-sinatra


vim public-bookmarks.rb

require 'sinatra'
get '/' do
"#{['Hello', 'Hi', 'Hey', 'Yo'][rand(4)]} World!"
end


vim Gemfile

source 'https://rubygems.org' #gem源自行修改
gem 'sinatra'
ruby '2.1.2'


Note: bundle

vim config.ru

require './public-bookmarks'
run Sinatra::Application


rackup -p 4567


layout

# public-bookmarks.rb
require 'sinatra'
get '/' do
erb :hello_world
end


mkdir -p views


#vim views/hello_world.erb
<%= ['Hello', 'Hi', 'Hey', 'Yo'][rand(4)] %> World!


layout

<!DOCTYPE html>
<html>
<head><title>PublicBookmarksSinatra</title></head>
<body>

<%= yield %>

</body>
</html>


Use ActiveRecord

# vim Gemfile
gem 'sinatra-activerecord'
gem 'pg'
gem 'rake'


Note: bundle

config/database.yml

#vim database.yml
development:
adapter: postgresql
database: public-bookmarks-sinatra_development
host: localhost
username: postgres
password: root


# vim Rakefile
require 'sinatra/activerecord/rake'
require './public-bookmarks'


然后在主文件里引入

# public-bookmarks.rb
require 'sinatra'
require 'sinatra/activerecord'
get '/' do
db_time = database.connection.execute('SELECT CURRENT_TIMESTAMP').first['now']
request.logger.info "DB time is #{db_time}"
erb :hello_world
end


现在重新启动下试试

rake db:create
rackup -p 4567


可以在后台日志看见相关的输出信息。

Build model

# 首先指定并创建一个migration的名字为create_public_bookmarks
rake db:create_migration NAME=create_public_bookmarks


然后打开这个文件 并且写入相关字段

# db/migrate/YYYYMMDDHHMMSS_create_public_bookmarks.rb
class CreatePublicBookmarks < ActiveRecord::Migration
def change
create_table :public_bookmarks do |t|
t.string :title
t.string :url
t.text :description
t.string :submitter_email

t.timestamps
end
add_index :public_bookmarks, :url, unique: true
end
end


执行迁移文件

rake db:migrate


接下来创建 public_bookmark model

mkdir models


# vim models/public_bookmark.rb
class PublicBookmark < ActiveRecord::Base
end


接下来我们需要在主文件里指定model

#public-bookmarks.rb
...
require './models/public_bookmark'
...


Build Controllers

Note: 在一些时候，我们需要类似rails的notice等闪存方式来提示信息。所以需要安装一个gem.

# Gemfile
...
gem 'rack-flash3'
...


Note: bundle

这个和model类似，需要在主文件内部指定实用。

# public-bookmarks.rb
...
require './models/public_bookmark'
require 'rack-flash'

enable :sessions
use Rack::Flash
...


基本的配置差不多就这样，接下来，可以给controller填充一些action

get '/public_bookmarks' do
@public_bookmarks = PublicBookmark.all
erb :'public_bookmarks/index'
end

get '/public_bookmarks/new' do
@public_bookmark = PublicBookmark.new
erb :'public_bookmarks/new'
end

get '/public_bookmarks/:id' do
@public_bookmark = PublicBookmark.find(params[:id])
erb :'public_bookmarks/show'
end

post '/public_bookmarks/create' do
@public_bookmark = PublicBookmark.new(params[:public_bookmark])
if @public_bookmark.save
flash[:notice] = 'Public bookmark successfully created!'
redirect to("public_bookmarks/#{@public_bookmark.id}")
else
erb :'public_bookmarks/new'
end
end


然后就可以在views下创建一个public_bookmarks文件夹，创建对应的view.

#views/public_bookmarks/index.erb:

<span>Listing public_bookmarks</span>

<p id="notice"><%= flash[:notice] %></p>

<table>
<thead>
<tr>
<th>Title</th>
<th>Url</th>
<th>Description</th>
<th>Submitter email</th>
<th colspan="3"></th>
</tr>
</thead>

<tbody>
<% @public_bookmarks.each do |public_bookmark| %>
<tr>
<td><%= public_bookmark.title %></td>
<td><%= public_bookmark.url %></td>
<td><%= public_bookmark.description %></td>
<td><%= public_bookmark.submitter_email %></td>
<td>
<a href="/public_bookmarks/<%= public_bookmark.id %>">
Show
</a>
</td>
<% if @authenticated %>
<td>
<form action="/public_bookmarks/destroy/<%= public_bookmark.id %>" method='post'>
<input type='submit' value='Destroy' onclick="return confirm('Are you sure?')">
</form>
</td>
<% end %>
</tr>
<% end %>
</tbody>
</table>

<br>

<a href='/public_bookmarks/new'>
New Public Bookmark
</a>

#views/public_bookmarks/show.erb:

<p id="notice"><%= flash[:notice] %></p>

<p>
<strong>Title:</strong>
<%= @public_bookmark.title %>
</p>

<p>
<strong>Url:</strong>
<%= @public_bookmark.url %>
</p>

<p>
<strong>Description:</strong>
<%= @public_bookmark.description %>
</p>

<p>
<strong>Submitter email:</strong>
<%= @public_bookmark.submitter_email %>
</p>

<a href='/public_bookmarks'>
Back
</a>

# views/public_bookmarks/new.erb:

<span>New public_bookmark</span>

<%= erb :'public_bookmarks/form' %>

<a href='/public_bookmarks'>
Back
</a>

# views/public_bookmarks/form.erb:

<form action="/public_bookmarks/create" method='post'>
<% if @public_bookmark.errors.any? %>
<div id="error_explanation">
<span><%= pluralize(@public_bookmark.errors.count, "error") %> prohibited this public_bookmark from being saved:</span>

<ul>
<% @public_bookmark.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>

<div class="field">
<label for="public_bookmark_title">Title</label><br>
<input id="public_bookmark_title" name="public_bookmark[title]" type="text">
</div>
<div class="field">
<label for="public_bookmark_url">Url</label><br>
<input id="public_bookmark_url" name="public_bookmark

原文" target=_blank>" type="text">
</div>
<div class="field">
<label for="public_bookmark_description">Description</label><br>
<textarea id="public_bookmark_description" name="public_bookmark[description]"></textarea>
</div>
<div class="field">
<label for="public_bookmark_submitter_email">Submitter email</label><br>
<input id="public_bookmark_submitter_email" name="public_bookmark[submitter_email]" type="text">
</div>
<div class="actions">
<input type="submit" value="Create Public bookmark">
</div>
</form>[/code]

[title3][url=https://www.airpair.com/ruby-on-rails/posts/rails-vs-sinatra]原文
[url=https://github.com/xiaohesong/public-bookmarks-sinatra]github
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