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我想做一些重缓存(DHH 称之为俄罗斯娃娃缓存),但我不知道该怎么做,因为我有很多内容取决于用户和他拥有的属性。

您将如何在这样的视图上执行 RDC?:

<% if signed_in? %>
  <div class="timeline">
    <%= link_to image_tag(current_user.avatar), designer_path(current_user), :class => "avatar topimg" %>
    <%= content_tag(:span, "your profile", :class => "description") %>
    <%= link_to "", new_design_path, :class => "upload icon-upload" %>
    <%= content_tag(:span, "upload a new design", :class => "description") %>
    <%= link_to "", designer_path(current_user)+"/favorites", :class => "upload icon-star" unless current_user.followees_by_type("design").blank? %>
    <%= content_tag(:span, "designs you've favorited", :class => "description") unless current_user.followees_by_type("design").blank? %>
    <%= content_tag(:span, current_user.current_invites, :class => "invites_count") unless current_user.current_invites <= 0 || current_user.full_member == false %>
    <%= link_to "", "#", :class => "invite icon-plus "+("blue" unless current_user.current_invites == 0).to_s unless current_user.current_invites < 0 || current_user.full_member == false  %>
    <%= content_tag(:span, "invite a friend ("+current_user.current_invites.to_s+" invites left)", :class => "description") unless current_user.current_invites < 0  %>
    <%= content_tag(:span, activity, :class => "activity_count") unless activity == 0 %>
    <%= link_to "", designer_path(current_user)+"/statistics", :class => "upload icon-activity "+("blue" unless activity == 0).to_s unless activity == 0 %>
    <%= content_tag(:span, ("your activity ("+pluralize(activity, 'new thing')+")"), :class => "description") unless activity == 0%>
  </div>
<% else %>
  <%= link_to raw('<i class="icon-twitter icon-font"></i><span>login with twitter</span>'), "/auth/twitter", :class => "btn btn-twitter grey-tweet" %>
<% end %>
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1 回答 1

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您可以将整个内容包装在一个大缓存块中,如下所示:

<% cache ['timeline', @user] do %>
  ...
<% end %>

这将使用键时间轴/#{@user.cache_key} 对其进行缓存。cache_key默认包含记录id和updated_at,所以一旦用户记录更新,缓存的fragment就会自动失效*。

请注意,如果您在片段中使用关系(例如追随者),则每次更新其中一个关系时都应该触摸用户对象。这可以通过在关系上设置 :touch => true 来自动完成,如下所示:

class Follower
  belongs_to :user, :touch => true
  ...

(*) 请注意,过期的缓存键并没有真正失效,它只是不再被使用。您应该为所有缓存键设置一个过期时间或做一些定期的内务处理以避免溢出缓存。

于 2012-08-30T15:44:29.930 回答