我的控制器上有：
class FormulariosController < ApplicationController
cache_sweeper :campanha_sweeper, :only => [:show]
# actions
end
我尝试在应用程序中创建一个名为 /sweepers 的目录，但没有成功，我尝试在模型内部创建一个 /cache 文件夹（有一个博客以此为例），但没有成功。
我的扫地机是这样的：
class CampanhaSweeper < ActionController::Caching::Sweeper
observe Campanha
def after_update(campanha)
expire_cache_for(campanha)
end
private
def expire_cache_for(campanha)
expire_page(:controller => 'formularios', :action => 'show')
ap "Expired cache for formularios#show in formulariosweeper"
end
结尾
我在尝试启动服务器时得到以下信息：
/Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.0.12/lib/action_controller/caching/sweeping.rb:41:in `const_get': uninitialized constant CampanhaSweeper (NameError)
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.0.12/lib/action_controller/caching/sweeping.rb:41:in `block in cache_sweeper'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.0.12/lib/action_controller/caching/sweeping.rb:39:in `each'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.0.12/lib/action_controller/caching/sweeping.rb:39:in `cache_sweeper'
from /Users/thiagomassa/Projects-ginga/ginga-campanhas/app/controllers/formularios_controller.rb:2:in `<class:FormulariosController>'
from /Users/thiagomassa/Projects-ginga/ginga-campanhas/app/controllers/formularios_controller.rb:1:in `<top (required)>'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/engine.rb:138:in `block (2 levels) in eager_load!'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/engine.rb:137:in `each'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/engine.rb:137:in `block in eager_load!'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/engine.rb:135:in `each'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/engine.rb:135:in `eager_load!'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/application.rb:108:in `eager_load!'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/application/finisher.rb:41:in `block in <module:Finisher>'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/initializable.rb:25:in `instance_exec'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/initializable.rb:25:in `run'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/initializable.rb:50:in `block in run_initializers'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/initializable.rb:49:in `each'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/initializable.rb:49:in `run_initializers'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/application.rb:134:in `initialize!'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/application.rb:77:in `method_missing'
from /Users/thiagomassa/Projects-ginga/ginga-campanhas/config/environment.rb:5:in `<top (required)>'
from /Users/thiagomassa/Projects-ginga/ginga-campanhas/config.ru:3:in `block in <main>'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/builder.rb:46:in `instance_eval'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/builder.rb:46:in `initialize'
from /Users/thiagomassa/Projects-ginga/ginga-campanhas/config.ru:1:in `new'
from /Users/thiagomassa/Projects-ginga/ginga-campanhas/config.ru:1:in `<main>'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/builder.rb:35:in `eval'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/builder.rb:35:in `parse_file'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/server.rb:162:in `app'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/server.rb:253:in `wrapped_app'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/rack-1.2.5/lib/rack/server.rb:204:in `start'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/commands/server.rb:65:in `start'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/commands.rb:30:in `block in <top (required)>'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/commands.rb:27:in `tap'
from /Users/thiagomassa/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.12/lib/rails/commands.rb:27:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
为什么它不起作用？此外，是否有任何方法可以使仅视图（其呈现方式）的缓存过期。我正在动态生成视图，如果我可以使位于views/formularios/a.html.rb 的视图的缓存过期，这将非常有用
如果人们想知道我在做什么，这很简单。我使用表单生成视图，当我想更新该视图（或它的代码）并且我在生产中时，视图由于缓存而没有更新，所以我每次“更新”表单时都必须手动重置它的缓存.
谢谢。