图片上传插件Acts As Attachment

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开始也是下载
在项目目录下面运行

script/plugin source http://svn.techno-weenie.net/projects/plugins

然后是安装

script/plugin install acts_as_attachment

创建dvd_cover模型

script/generate attachment_model dvd_cover


     create_table :dvd_covers do |t|
       t.column "dvd_id", :integer
       t.column "content_type", :string
       t.column "filename", :string
       t.column "size", :integer
       t.column "parent_id",  :integer
       t.column "thumbnail", :string
       t.column "width", :integer
       t.column "height", :integer
     end

数据库重新rake下

rake db:migrate

下面在把生成的模型DvdCover中的代码替换成这个(全部替换下就好了)

class DvdCover < ActiveRecord::Base
   belongs_to :dvd
   acts_as_attachment :storage => :file_system, :max_size => 300.kilobytes, :content_type => :image
  validates_as_attachment
 end

让后下面的自己去写下吧(分开了反而看不清楚)

## app/controllers/dvd_covers_controller.rb
 class DvdCoversController < ApplicationController
   def index
     @dvd_covers = DvdCover.find(:all)
   end

   def new
     @dvd_cover = DvdCover.new
   end

   def show
     @dvd_cover = DvdCover.find params[:id]
   end

   def create
     @dvd_cover = DvdCover.create! params[:dvd_cover]
     redirect_to :action => 'show', :id => @dvd_cover
   rescue ActiveRecord::RecordInvalid
     render :action => 'new'
   end
 end

 ## app/views/dvd_covers/index.rhtml
DVD Covers

    
    <% @dvd_covers.each do |dvd_cover| -%>     
      <%= link_to dvd_cover.filename, :action => 'show', :id => dvd_cover %>     
    <% end -%>

 <%= link_to 'New', :action => 'new' %>

 ## app/views/dvd_covers/new.rhtml
New DVD Cover

 <% form_for :dvd_cover, :url => { :action => 'create' }, :html => { :multipart => true } do |f| -%>
   <%= f.file_field :uploaded_data %>
  <%= submit_tag :Create %>
 <% end -%>

 ## app/views/dvd_covers/show.rhtml
 <%= @dvd_cover.filename %>
 <%= image_tag @dvd_cover.public_filename, :size => @dvd_cover.image_size %>