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在我的意見之一，我有：爲什麼我的緩存片段沒有存儲？
- cache("crumb") do
%ul.breadcrumb
在瀏覽器中，查看負載和你看到的麪包屑。
在development.rb，我有：
config.consider_all_requests_local = true
config.action_controller.perform_caching = true
config.cache_store = :dalli_store
加載視圖後，爲什麼我那麼有：
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
的緩存讀取和命令行寫：
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"
但即使我以這種方式在命令行寫入緩存後，我看到了我的視圖的HTML，而不是「f oo「，當我重新加載頁面時在瀏覽器中。
注意：一旦我得到這個工作，我會在模型中包含模型對象。但爲了本文的目的，我故意簡化了測試用例。