#6 楼 @azhao #7 楼 @quakewang

谢谢，这些方法看起来是我想要的。

#1 楼 @ntsai 恩 谢谢！

另外问一下 是不是 jquery file upload 必须要传到在线服务器的？本地不可以用的吗？

还有问题，carrierwave 只能传一个图片 (不过弄完之后我发现这个确实很方便), 现在我想可以传重复的图片。

我刚才试了 jQuery File Upload 的 Basic plugin (minimal setup guide) 和 Rails + (Carrierwave || Dragonfly) Rails-setup-for-V6 (user contribution)，但是都没有成功。

还有看到支持 rails 的 tutorial 都要 amazon s3(我没有美元信用卡申请不了),还有看到一个 google app engine 的，小试了一下，怀疑得配置更多东西，懒得弄了。

不知道上传多张图片得还有什么好得 gem，专门正对 rails 的。今天进度缓慢，只搞了这个 carrierwave!

#22 楼 @HungYuHei 呵呵

#20 楼 @Rei 恩 是的 呵呵！

#17 楼 @Rei 我刚刚不小心又看到一个，说 carriewave 没有被加载在当前运作的 rails 服务器中，只要重启就好了，突然感觉很开心，然后重启了之后果然好了 哈哈！谢谢

#4 楼 @Rei 恩

#1 楼 @Rei 恩 我先记下，下回试试

rake db:schema:load

我运行这条命令，所有数据库内容都被清空了，啊！！(如果你刚好 google 进来看到这个，请谨慎！)

#17 楼 @Rei 好的 谢谢 我在重做

#15 楼 @Rei 是这儿吗？

ctd git:(master) ✗ rails g uploader image
      create  app/uploaders/image_uploader.rb

actionpack (3.2.6) lib/action_controller/metal/hide_actions.rb:36:in `visible_action?'
actionpack (3.2.6) lib/action_controller/metal/hide_actions.rb:18:in `method_for_action'
actionpack (3.2.6) lib/action_controller/metal/implicit_render.rb:14:in `method_for_action'
actionpack (3.2.6) lib/action_controller/metal/compatibility.rb:61:in `method_for_action'
actionpack (3.2.6) lib/abstract_controller/base.rb:115:in `process'
actionpack (3.2.6) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.6) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.6) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.6) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:600:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__1603190885298670096__call__4510840069410552607__callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.6) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.6) lib/rails/engine.rb:479:in `call'
railties (3.2.6) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.6) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/Users/yuwen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/Users/yuwen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/Users/yuwen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

#10 楼 @Rei 是在 work_controller 里面？

class WorksController < ApplicationController
  # GET /works
  # GET /works.json
  def index
    @works = Work.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @works }
    end
  end

  # GET /works/1
  # GET /works/1.json
  def show
    @work = Work.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @work }
    end
  end

  # GET /works/new
  # GET /works/new.json
  def new
    @work = Work.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @work }
    end
  end

  # GET /works/1/edit
  def edit
    @work = Work.find(params[:id])
  end

  # POST /works
  # POST /works.json
  def create
    @work = Work.new(params[:work])

    respond_to do |format|
      if @work.save
        format.html { redirect_to @work, notice: 'Work was successfully created.' }
        format.json { render json: @work, status: :created, location: @work }
      else
        format.html { render action: "new" }
        format.json { render json: @work.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /works/1
  # PUT /works/1.json
  def update
    @work = Work.find(params[:id])

    respond_to do |format|
      if @work.update_attributes(params[:work])
        format.html { redirect_to @work, notice: 'Work was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @work.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /works/1
  # DELETE /works/1.json
  def destroy
    @work = Work.find(params[:id])
    @work.destroy

    respond_to do |format|
      format.html { redirect_to works_url }
      format.json { head :no_content }
    end
  end
end

shell 里面：

➜  ctd git:(master) ✗ rails g uploader image
      create  app/uploaders/image_uploader.rb
➜  ctd git:(master) ✗ rails g scaffold Work title:string description:text
      invoke  active_record
      create    db/migrate/20120725114714_create_works.rb
      create    app/models/work.rb
      invoke    test_unit
      create      test/unit/work_test.rb
      create      test/fixtures/works.yml
      invoke  resource_route
       route    resources :works
      invoke  scaffold_controller
      create    app/controllers/works_controller.rb
      invoke    erb
      create      app/views/works
      create      app/views/works/index.html.erb
      create      app/views/works/edit.html.erb
      create      app/views/works/show.html.erb
      create      app/views/works/new.html.erb
      create      app/views/works/_form.html.erb
      invoke    test_unit
      create      test/functional/works_controller_test.rb
      invoke    helper
      create      app/helpers/works_helper.rb
      invoke      test_unit
      create        test/unit/helpers/works_helper_test.rb
      invoke  assets
      invoke    coffee
      create      app/assets/javascripts/works.js.coffee
      invoke    scss
      create      app/assets/stylesheets/works.css.scss
      invoke  scss
    conflict    app/assets/stylesheets/scaffolds.css.scss
  Overwrite /Users/yuwen/Documents/bitbucket/ctd/app/assets/stylesheets/scaffolds.css.scss? (enter "h" for help) [Ynaqdh] n
        skip    app/assets/stylesheets/scaffolds.css.scss
➜  ctd git:(master) ✗ rake db:migrate
==  CreateWorks: migrating ====================================================
-- create_table(:works)
   -> 0.0015s
==  CreateWorks: migrated (0.0016s) ===========================================

➜  ctd git:(master) ✗ rails g migration add_image_to_works image:string      
      invoke  active_record
      create    db/migrate/20120725115122_add_image_to_works.rb
➜  ctd git:(master) ✗ rake db:migrate
==  AddImageToWorks: migrating ================================================
-- add_column(:works, :image, :string)
   -> 0.0399s
==  AddImageToWorks: migrated (0.0400s) =======================================

Gemfile:

source 'https://rubygems.org'

gem 'rails', '3.2.6'
gem 'sqlite3'
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'
# gem 'jbuilder'
# gem 'debugger'

gem 'carrierwave'
# gem 'paperclip',:git => 'git://github.com/thoughtbot/paperclip.git'

我看到教程是只有加了这些它那里就可以上传了，我这儿报错。

class Work < ActiveRecord::Base
  attr_accessible :description, :title, :image
  mount_uploader :image, ImageUploader
end

是不是这里？

报错：

 NoMethodError in WorksController#new

undefined method `key?' for nil:NilClass

Rails.root: /Users/yuwen/Documents/bitbucket/ctd
Application Trace | Framework Trace | Full Trace

Request

Parameters:

None

Show session dump

Show env dump
Response

Headers:

None

db/migrate/20120725115122_add_image_to_works.rb

class AddImageToWorks < ActiveRecord::Migration
  def change
    add_column :works, :image, :string
  end
end

db/migrate/20120725114714_create_works.rb

class CreateWorks < ActiveRecord::Migration
  def change
    create_table :works do |t|
      t.string :title
      t.text :description

      t.timestamps
    end
  end
end

http://0.0.0.0:3000/works/new:也是返回

 NoMethodError in WorksController#new

undefined method `key?' for nil:NilClass

是我在 works controller 里面少什么？但是教程里面没有提到

这个 carriewave 哪里出错了？ bundl show:

...
* carrierwave (0.6.2)
...

Gemfile:

...
gem 'carrierwave'
...

work.rb

class Work < ActiveRecord::Base
  attr_accessible :description, :title, :image
  mount_uploader :image, ImageUploader
end

works/_form.html.erb

<%= form_for(@work, :html => {:multipart => true}) do |f| %>
  # rest field
<div class="field">
    <%= f.label :image %><br />
    <%= f.file_field :image %>
  </div>
  # simbit
<% end %>

打开http://0.0.0.0:3000/works,:返回

 NoMethodError in WorksController#index

undefined method `key?' for nil:NilClass

这是我完全参照视频教程来做的，不知道哪里出错了

#3 楼 @Rei 好的 谢谢

#1 楼 @leozwa 好的 谢谢，我也再折腾折腾

很好，估计女孩子看了都会爱上你吗？太有才了

辛苦了，感谢大力贡献！

待会看，谢谢！
我在想，如果也把{}去掉，通过缩进来写，是不是更好看一些？

谢谢 先收下了

简易安装和运行 mongodb(安装由 homebrew 直接安装):

brew install mongodb

只要运行这条命令就可直接安装完成。

建立 mongodb 文件夹：

sudo mkdir -p /data/db/

接着：

sudo chown `id -u` /data/db  #这条命令是什么意思？

现在，再次在 shell 里面输入：

mongod

就可以运行 mongo 数据库了。

#2 楼 @fresh_fish 谢谢可以了。

rails 默认 id 排序：1,2,3,4..这样排列，结果就是最先发表的 id 为 1 排在最前。 只要在创建的新闻模型中加上以下代码即可将结果按照符合人的逻辑排列：

default_scope order:  'id desc'

完整的是这样的: 找到文件:project/app/models/article.rb，在开头加入即可

class Article < ActiveRecord::Base
  default_scope order: 'id desc' #注意是'id desc'
  #...
end

#3 楼 @Rei 恩 我待会就看一下这一章 #4 楼 @huacnlee 是的，一下子感觉好简单 哈哈。已解决！

#1 楼 @chucai 谢谢，很抱歉新手啊，不太听得懂