Rails Fragment缓存不起作用

我试图添加片段缓存来加速网站的性能。现在，我测试了它在development模式，所以我改变了Rails Fragment缓存不起作用

#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。每次刷新页面时，都会在终端中再次显示查询。

我以为它只会在第一次查询一次，或者我误解了缓存的概念？

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)

来源

2016-07-15 Coda Chang

根据你的日志，项目是从缓存中读取的。行看起来像是“Read fragment views/projects/3670-20160715055333331671000” – power

因此，无论如何，它会再次查询，并自动决定是否使用新的查询数据或缓存数据？ –

根据您的日志，它看起来像数据是产品从缓存中填充，并且不会为产品启动查询。

views/projects/3670-20160715055333331671000/9b54e2d9c7ce230e3f6a333f00d549da

中间的数字是产品记录的updated_at属性中的product_id后跟timestamp值。 Rails使用时间戳值来确保它没有提供陈旧的数据。如果updated_at的值已更改，则会生成一个新密钥（触发对数据库的查询）。然后，Rails将为该密钥写入一个新的缓存，并且写入旧密钥的旧缓存不会再被使用。希望得到这个帮助！

来源

2016-07-15 07:07:07 power

谢谢，我现在明白了。很好的答案！ –

Rails Fragment缓存不起作用

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