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在我的意见之一，我有：为什么我的缓存片段没有存储？
- cache("crumb") do
%ul.breadcrumb
在浏览器中，查看负载和你看到的面包屑。
在development.rb，我有：
config.consider_all_requests_local = true
config.action_controller.perform_caching = true
config.cache_store = :dalli_store
加载视图后，为什么我那么有：
ActionController::Base.new.read_fragment("crumb")
Cache read: views/crumb
D, [2016-01-14T12:14:12.707228 #2465] DEBUG – : Cache read: views/crumb
Read fragment views/crumb (0.5ms)
I, [2016-01-14T12:14:12.707727 #2465] INFO – : Read fragment views/crumb (0.5ms)
=> nil
的缓存读取和命令行写：
ActionController::Base.new.write_fragment("crumb", "foo")
Cache write: views/crumb
D, [2016-01-14T12:14:29.401736 #2465] DEBUG – : Cache write: views/crumb
Write fragment views/crumb (1.2ms)
I, [2016-01-14T12:14:29.402987 #2465] INFO – : Write fragment views/crumb (1.2ms)
=> "foo"
[4] pry(main)> ActionController::Base.new.read_fragment("crumb")
Cache read: views/crumb
D, [2016-01-14T12:14:33.990289 #2465] DEBUG – : Cache read: views/crumb
Read fragment views/crumb (0.6ms)
I, [2016-01-14T12:14:33.990858 #2465] INFO – : Read fragment views/crumb (0.6ms)
=> "foo"
但即使我以这种方式在命令行写入缓存后，我看到了我的视图的HTML，而不是“f oo“，当我重新加载页面时在浏览器中。
注意：一旦我得到这个工作，我会在模型中包含模型对象。但为了本文的目的，我故意简化了测试用例。