rails 4缓存过期不起作用 | 4缓存过期不起作用

本文介绍了rails 4缓存过期不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

在我的Rails应用程序中，我试图使用嵌套缓存，但是当user.profile.full_name更改时，我的缓存键没有过期.因此，当用户更改其姓名时，_profile_product.html.erb显示的全名仍然是旧名称.

In my rails app I'm trying to use nested caches, but my cache-key is not expiring when user.profile.full_name is changed. So when user changes his/her name the full_name displayed by _profile_product.html.erb remains the old one.

我应该如何更改密钥?

profiles/show.html.erb

<% cache(@profile) do %> #this is the profile info and the cache key expires properly when @profile.full_name changes
  <%= @profile.full_name %>
  .....
<% end %>
<% if @profile.user.products.any? %> #not nested in the previous cache;
  #products belonging to the profile are listed with this code under the profile info
  <%= render 'products/profile_products' %>
<% end %>

_profile_products.html.erb

<% cache(['profile-products', @profile_products.map(&:id), @profile_products.map(&:updated_at).max]) do %>
  <%= render partial: "products/profile_product", collection: @profile_products, as: :product %>
<% end %>

_profile_product.html.erb

<% cache (['profile-product-single', product, product.user.profile]) do %>
  <%= product.name %>
  <%= product.user.profile.full_name %> #if I change profile name this one won't change thanks to the cache
<% end %>

推荐答案

尝试在其中更改缓存键

_profile_products.html.erb

<% cache(['profile-products', @profile_products.map(&:id), @profile_products.map(&:updated_at).max, @profile_products.map{|pp| pp.user.profile.updated_at.to_i }.max]) do %>
  <%= render partial: "products/profile_product", collection: @profile_products, as: :product %>
<% end %>

问题在于，当用户更新其个人资料名称时，包含整个列表的缓存片段不会过期.

The problem is that the cachefragment that contain the whole list doesn't expire when a user updated their profile name.

通过将关联的用户配置文件的updated_at的最大值添加到缓存键，当用户更新其配置文件时，缓存片段将过期.

By adding the max of the associated user-profile´s updated_at to the cache key, the cache fragment will expire when a user updates their profile.

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