背景：我正在使用Padrino，Ruby 1.9.2构建一个简单的博客， HAML和Heroku。我希望帖子索引具有杂志般的外观 它。对于索引中的每个帖子，用户应该看到标题，内容 戏弄和图像。我的问题是附加图像。
问题：我一直在尝试使用Paperclip gem来附加图像 到每个帖子。 Heroku将从Amazon S3 bin中捕获实际图像。 到目前为止，当我尝试运行迁移时，我收到错误：
$ .../base.rb:1088:in `method_missing': undefined method
`has_attached_file' for #<Class:0xa672140> (NoMethodError)
看起来像Paperclip只是不会加载，但我得到的地方 卡住。
详细说明： - 问：当我“尝试进行迁移”时，我在做什么？ - 答：我将以下内容放入迁移文件夹
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 rake ar：migrate”
- 问：我是否在Gemfile中列出了Paperclip？ --A：是的。
- 问：帖子模型是什么样的？ --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：app.rb是什么样的？ --a：
class Blog < Padrino::Application
register Padrino::Rendering
register Padrino::Mailer
register Padrino::Helpers
enable :sessions
get '/' do
haml :index
end
end
- 问：boot.rb是什么样的？ --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：完整的错误输出是什么样的？ --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>'
如果你已经读过这么久了......谢谢！我希望你能帮助我摆脱一些 对此有所了解。
答案 0 :(得分：2)
Paperclip与rails无关，因此您需要在boot.rb中加入Padrino.before_load：
ActiveRecord::Base.send(:include, Paperclip::Glue)
File.send(:include, Paperclip::Upfile)
Paperclip.options[:logger] = Padrino.logger
最后要在heroku下运行迁移，您应首先在本地padrino rake gen运行，这将创建Rakefile，因此您应该可以简单地运行：heroku rake ar:migrate