Rails Fragment緩存不起作用

我試圖添加片段緩存來加速網站的性能。現在，我測試了它在development模式，所以我改變了Rails Fragment緩存不起作用

#environments/developments.rb 
config.action_controller.perform_caching = true

而且在erb

<% @projects.each do |project| %> 
    <% cache project do %> 
     <%= link_to "#{project.name}", category_project_path(@category, project) %> 
     <br> 
    <% end %> 
<% end %>

但似乎不起作用。每次刷新頁面時，都會在終端中再次顯示查詢。

我以爲它只會在第一次查詢一次，或者我誤解了緩存的概念？

Processing by CategoriesController#show as HTML 
    Parameters: {"id"=>"3306"} 
    Category Load (0.4ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = $1 LIMIT 1 [["id", 3306]] 
    Project Load (0.5ms) SELECT "projects".* FROM "projects" WHERE "projects"."category_id" IN (3306) 
    (0.4ms) SELECT DISTINCT COUNT(DISTINCT "projects"."id") FROM "projects" WHERE "projects"."category_id" = $1 [["category_id", 3306]] 
    Project Load (1.0ms) SELECT DISTINCT "projects".* FROM "projects" WHERE "projects"."category_id" = $1 LIMIT 10 OFFSET 0 [["category_id", 3306]] 
    Cache digest for app/views/categories/show.html.erb: 9b54e2d9c7ce230e3f6a333f00d549da 
Read fragment views/projects/3670-20160715055333331671000/9b54e2d9c7ce230e3f6a333f00d549da (0.2ms) 
    Cache digest for app/views/categories/show.html.erb: 9b54e2d9c7ce230e3f6a333f00d549da 
Read fragment views/projects/3677-20160715055334439274000/9b54e2d9c7ce230e3f6a333f00d549da (0.2ms) 
    Cache digest for app/views/categories/show.html.erb: 9b54e2d9c7ce230e3f6a333f00d549da 
Read fragment views/projects/3678-20160715055334446172000/9b54e2d9c7ce230e3f6a333f00d549da (0.2ms) 
    Cache digest for app/views/categories/show.html.erb: 9b54e2d9c7ce230e3f6a333f00d549da 
Read fragment views/projects/3689-20160715055334536421000/9b54e2d9c7ce230e3f6a333f00d549da (0.1ms) 
    Rendered categories/show.html.erb within layouts/application (8.7ms) 
Completed 200 OK in 31ms (Views: 26.0ms | ActiveRecord: 2.3ms)

來源

2016-07-15 Coda Chang

根據你的日誌，項目是從緩存中讀取的。行看起來像是「Read fragment views/projects/3670-20160715055333331671000」 – power

因此，無論如何，它會再次查詢，並自動決定是否使用新的查詢數據或緩存數據？ –

根據您的日誌，它看起來像數據是產品從緩存中填充，並且不會爲產品啓動查詢。

views/projects/3670-20160715055333331671000/9b54e2d9c7ce230e3f6a333f00d549da

中間的數字是產品記錄的updated_at屬性中的product_id後跟timestamp值。 Rails使用時間戳值來確保它沒有提供陳舊的數據。如果updated_at的值已更改，則會生成一個新密鑰（觸發對數據庫的查詢）。然後，Rails將爲該密鑰寫入一個新的緩存，並且寫入舊密鑰的舊緩存不會再被使用。希望得到這個幫助！

來源

2016-07-15 07:07:07 power

謝謝，我現在明白了。很好的答案！ –

Rails Fragment緩存不起作用

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