使用Rails插件Paperclip上传视频到亚马逊 S3服务

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云服务里亚马逊的S3 和 EC2比较常用的，这里是介绍一个上传插件和S3一起使用的例子。

创建model

#video.rb
class Video < ActiveRecord::Base
  
  # Paperclip
  # http://www.thoughtbot.com/projects/paperclip
  has_attached_file :video, 
    :storage => :s3,
    :s3_credentials => "#{RAILS_ROOT}/config/s3.yml",
    :path => ":attachment/:id/:style/:basename.:extension",
    :bucket => 'yourbucketname' 

  # Paperclip Validations
  validates_attachment_presence :video
  validates_attachment_content_type :video, :content_type => ['application/x-shockwave-flash', 'application/x-shockwave-flash', 'application/flv', 'video/x-flv']
end

配置S3相关的配置

#config/s3.yml
access_key_id: YOURSECRETACCESSID
secret_access_key: YOUR-secRE/TACCe\ssKEy

添加插件

Rails::Initializer.run do |config|
  ...  
  config.gem 'right_aws', :version => '1.9.0'
  ...
end

执行

sudo rake gems:install 
sudo rake gems:unpack

Controller和view会如下：

class VideosController < ApplicationController
  
  def index
    @videos = Video.find :all
  end

  def new
    @video = Video.new
  end

  def create
    @video = Video.new(params[:video])
    if @video.save
      flash[:notice] = 'Video has been uploaded'
      redirect_to :action => 'index'
    else
      render :action => 'new'
    end
  end

  def show
    @video = Video.find(params[:id])
  end
  
end


# index view
Videos (<%= link_to 'Create new', new_video_path %>)


<% for video in @videos %>
	
<%= video.video_file_name %> <%= video.video.url %> <%= link_to 'view', video_path(video) %>
<% end %>


# new view
<% form_for(@video, :html => {:multipart => true, :class => 'styledform' }) do |f| %>
	<%= f.error_messages %>
	

		<%= f.label :video %>

		<%= f.file_field :video %>
	
	

	  <%= f.submit %> or <%= link_to 'Cancel', videos_path %>
	
<% end %>

# show view

  You need to have <%= link_to 'Flash Player', 'http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash' %> installed to display this video

配置flash player显示视频

1. 下载JW FLV MEDIA PLAYER (mediaplayer.zip）
2. 复制player.swf到public/flash/player.swf
3. 复制swfobject.js 到 public/javascript/swfobject.js
4. 修改配置application.html.erb加载swfobject.js

  
  
  <%= stylesheet_link_tag 'application' %>
	<%= javascript_include_tag :defaults %>
	<%= javascript_include_tag 'swfobject' %>

这样你就可以在http://localhost:3000/videos进行上传操作了


关于开发环境和生产环境

通过在配置yml来区分开发和生产环境往往是不错的办法
当然，这里有一个前提，就是有一个settings.yml用来加载load_config.rb file
设置如下：

 APP_CONFIG = YAML.load_file(“#{RAILS_ROOT}/config/settings.yml”)[RAILS_ENV].symbolize_keys

#In config/settings.yml
development: &non_production_settings
  site_url: http://localhost:3000
  site_name: Site
  admin_email: [email protected]
  bucket: yourappdevelopment
  
test:
  <<: *non_production_settings
  
production:
  site_url: http://domain.com
  site_name: Site
  admin_email: [email protected]
  bucket: yourappproduction 

#In video.rb
class Video < ActiveRecord::Base
  
  # Paperclip
  # http://www.thoughtbot.com/projects/paperclip
  has_attached_file :video,
    :storage => :s3,
    :s3_credentials => "#{RAILS_ROOT}/config/s3.yml",
    :path => ":attachment/:id/:style/:basename.:extension",
    :bucket => APP_CONFIG[:bucket]
end

出处