背景：我建立使用Padrino，红宝石1.9.2一个简单的博客， HAML和Heroku上。我想要的职位指数有一本杂志般的外观 给它。对于索引中的各岗位，用户应该看到标题，内容 玩笑和图像。我的问题是其附带的图像。

Background: I'm building a simple blog using Padrino, Ruby 1.9.2, HAML, and Heroku. I want the posts index to have a magazine-like look to it. For each post in the index, the user should see titles, content teasers, and images. My problem is with attaching the images.

问题：我一直在试图使用回形针宝石附加图像 到每个岗位。 Heroku的将鱼从Amazon S3的bin中的实际图像。 到目前为止，当我尝试运行迁移时，我得到的错误：

Problem: I've been trying to use the Paperclip gem to attach an image to each post. Heroku will fish the actual image from an Amazon S3 bin. So far, when I try to run a migration, I get the error:

$ .../base.rb:1088:in `method_missing': undefined method
`has_attached_file' for #<Class:0xa672140> (NoMethodError)

它看起来像回形针就不会加载，但有从哪里获得 卡住了。

It looks like Paperclip just won't load, but there's where I get stuck.

详细信息： --Q：我在做什么，当我尝试运行迁移？ --a：我把下列的迁移文件夹

Details: --Q: What am I doing when I "try to run a migration"? --A: I put the following into the migrations folder

class AddPictureToPost < ActiveRecord::Migration
  def self.up
    change_table :posts do |t|
      t.has_attached_file :picture
    end
  end

  def self.down
    drop_attached_file :posts, :picture
  end
end

然后运行padrino耙AR：迁移

then run "padrino rake ar:migrate"

- Q：我已经回形针在Gemfile中列出？ --a：是的，

--Q: Do I have Paperclip listed in the Gemfile? --A: Yes.

- 问：什么是岗位模型是什么样子？ --a：

--Q: What does the post model look like? --A:

class Post < ActiveRecord::Base
  has_attached_file :picture,
    :storage => :s3,
    :bucket => 'blog_images',
    :s3_credentials => {
      :access_key_id => ENV['S3_KEY'],
      :secret_access_key => ENV['S3_SECRET']
    }
end

- 问：什么是app.rb样子？ --a：

--Q: What does the app.rb look like? --A:

class Blog < Padrino::Application
  register Padrino::Rendering
  register Padrino::Mailer
  register Padrino::Helpers

  enable :sessions

  get '/' do
    haml :index
  end
end

- 问：你的boot.rb样子呢？ --a：

--Q: What does boot.rb look like? --A:

PADRINO_ENV  = ENV["PADRINO_ENV"] ||= ENV["RACK_ENV"] ||=
"development"  unless defined?(PADRINO_ENV)
PADRINO_ROOT = File.expand_path('../..', __FILE__) unless defined?
(PADRINO_ROOT)

require 'rubygems' unless defined?(Gem)
require 'bundler/setup'
Bundler.require(:default, PADRINO_ENV)

Padrino.before_load do
end

Padrino.after_load do
end

Padrino.load!

- 问：什么是完全错误输出是什么样子？ --a：

--Q: What does the full error output look like? --A:

jared:~/blog$ padrino rake ar:migrate
=> Executing Rake ar:migrate ...
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/
active_record/base.rb:1088:in `method_missing': undefined method
`has_attached_file' for #<Class:0xa1ffb30> (NoMethodError)
        from /home/jared/isthmus2/app/models/post.rb:2:in `<class:Post>'
        from /home/jared/isthmus2/app/models/post.rb:1:in `<top (required)>'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `block in require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:223:in `block in load_dependency'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:640:in `new_constants_in'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:223:in `load_dependency'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/reloader.rb:148:in `safe_load'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:162:in `block in require_dependencies'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:160:in `each'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:160:in `require_dependencies'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/application.rb:34:in `inherited'
        from /home/jared/blog/app/app.rb:1:in `<top (required)>'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `block in require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:223:in `block in load_dependency'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:640:in `new_constants_in'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:223:in `load_dependency'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/reloader.rb:148:in `safe_load'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:162:in `block in require_dependencies'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:160:in `each'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:160:in `require_dependencies'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/mounter.rb:148:in `locate_app_object'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/mounter.rb:30:in `initialize'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/mounter.rb:221:in `new'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/mounter.rb:221:in `mount'
        from /home/jared/blog/config/apps.rb:34:in `<top (required)>'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `block in require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:223:in `block in load_dependency'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:640:in `new_constants_in'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:223:in `load_dependency'
        from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/
active_support/dependencies.rb:240:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/reloader.rb:148:in `safe_load'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:162:in `block in require_dependencies'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:160:in `each'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:160:in `require_dependencies'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:70:in `block in load!'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:70:in `each'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/loader.rb:70:in `load!'
        from /home/jared/blog/config/boot.rb:29:in `<top (required)>'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/cli/base.rb:56:in `require'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/cli/base.rb:56:in `block in rake'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/cli/base.rb:140:in `capture'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/lib/
padrino-core/cli/base.rb:56:in `rake'
        from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:
22:in `run'
        from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/
invocation.rb:118:in `invoke_task'
        from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor.rb:
263:in `dispatch'
        from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/base.rb:
389:in `start'
        from /usr/local/lib/ruby/gems/1.9.1/gems/padrino-core-0.10.5/bin/
padrino:9:in `<top (required)>'
        from /usr/local/bin/padrino:19:in `load'
        from /usr/local/bin/padrino:19:in `<main>'

如果你已经读到这...谢谢！我希望你能帮助我一些线索 光这一点。

If you've read this far...THANKS! I hope you can help me shed some light on this.

推荐答案

回形针是轨道不可知的，所以你需要把的boot.rb 在 Padrino.before_load 这样的：

Paperclip is rails agnostic so you need to put in boot.rb in Padrino.before_load this:

  ActiveRecord::Base.send(:include, Paperclip::Glue)
  File.send(:include, Paperclip::Upfile)

  Paperclip.options[:logger] = Padrino.logger

最后跑在的Heroku 迁移，你应该先运行本地 padrino耙创这将创建一个 Rake文件所以你应该能够简单地运行： Heroku的耙AR：迁移

Finally to run migrations under heroku you should run first locally padrino rake gen this will create a Rakefile so you should able to run simply: heroku rake ar:migrate