Ruby on rails - 如何在使用分页(kaminari)时使用dalli实现片段缓存 - ruby on rails - How can I implement fragment cache with dalli when using pagination (kaminari)? 小贝子编程网

我知道dalli（缓存）是非常强大的插件，可以增强静态页面的性能。
但是，经常更新的带有分页的动态页面呢？
设置dalli的正确方法是什么？

例如，我遇到的一个问题：使用分页时，dalli将不同的参数[:p age]识别为同一页面：（

当两者使用dalli时，你们将如何设计系统

经常更新的页面
不会经常更新的页面

例如。我有 4 种型号，例如 User、Community、Topic 和 Comment(defined Polymorphic to both Community, and Topic. They can be created or shown in #show pages)

就像

社区> （has_many）> 主题> （has_many）>评论
社区> （has_many）>评论
它们都属于用户（创建者）

我当前的代码就是这样（这有点长。对此感到抱歉）
我在使用缓存时面临分页问题...

-------------------------------------设置----------------------------------------

config/environment/development.rb

config.consider_all_requests_local       = true
config.action_controller.perform_caching = true
config.cache_store = :dalli_store

路线.rb

resources :communities do
    resources :topics do
        resources :comments do
    end
end

-------------------------------------社区----------------------------------------

controllers/communities_controller.rb#index&show

caches_page :show
caches_action :edit, :new
def index
    ....
    if params[:sort] == 'new'
        @communities = Community.scoped.page(params[:page]).order("created_at DESC")
    elsif params[:sort] = 'popular'
        @communities = Community.scoped.page(params[:page]).order("follow_count DESC")
    elsif params[:sort] = 'reputation'
        @communities = Community.scoped.page(params[:page]).order("reputation_count DESC")
    else
        @communities = Community.scoped.page(params[:page]).order("created_at DESC")
    end
    ....
end
def show
    @community = Community.find(params[:community_id])
    @comments @community.comments.page(params[:page]
    @topics = @community.topics.limit(10)
end

views/communities/index.html.erb注意：但是，即使我移动到下一个参数[:p age]，内容也会相同:(似乎缓存将不同的页面识别为相同的内容......

#here, the url will could be something like this example.com/communities?utf8=✓&location=14&genre=3&search=strawberry
 But this is going to create gigantic petterns of the caches:(  
 So I want to make it work only when params[:sort] was not empty. Because, no other parameters come with when params[:sort] is not empty. 
 It could be like, example.com/communities?sort=new, example.com/communities?sort=popular, example.com/communities?sort=reputation

...
<% if params[:sort] %>
    <% @key = "community_index_" + params[:sort] + params[:page] %>
    <% cache(:controller => "communities", :action => "index", :action_suffix => @key) do %>
        <%= page_entries_info(@communities, :entry_name => 'community').html_safe %>
        <%= paginate @communities, :window => 4 %>
        <% @communities.each do |community| %>  
            <%= render 'communities/community', :community => community %>
        <% end %>
    <% end %>
<% end %>
...

视图/社区/显示.html.erb

...
<% @key = params[:community_name] + "_community_show_information" %>
<% cache(:controller => "communities", :action => "show", :action_suffix => @key) do %>
    <h2>Information</h2>
    <div class="CommunityInformation">
        <%= render 'communities/information'%>
    </div>
<% end %>

<% @key = params[:community_name] + "_community_show_wall_" + params[:page] + %>
<% cache(:controller => "communities", :action => "show", :action_suffix => @key) do %>
<%= paginate @comments, :window => 4 %>
    <h2>Topic</h2>
    <div class="WallInformation">
        <%  @comments.eager.recent.each do |comment| %>
            <%= render 'communities/comment', :comment => comment %>
        <% end %>
    </div>
<% end %>
<% @key = params[:community_name] + "_community_show_topics" %>
<% cache(:controller => "communities", :action => "show", :action_suffix => @key) do %>
    <h2>Topic</h2>
    <div class="TopicInformation">
        <%  @topics.eager.recent.each do |topic| %>
            <%= render 'communities/topic', :topic => topic %>
        <% end %>
    </div>
<% end %>
...

型号/community_sweeper.rb

class CommunitySweeper < ActionController::Caching::Sweeper
  observe Community

  def after_save(record)
    expire_fragment(url_for(:action => 'index', :only_path => true) + '?????(all the caches related to the community#index)')
    expire_fragment(url_for(:action => 'show', :only_path => true) + '?????(the cache related to the particular community#show)')
  end
end
end

-------------------------------------话题----------------------------------------

controllers/topics_controller.rb#index&show

caches_page :show
caches_action :edit, :new
def index
    ....
    @community = Community.find(params[:community_id])
    @topics = @community.topics.page(params[:page]
    ....
end
def show
    @topic = Topic.find(params[:id])
    @comments = @topic.comments.page(params[:page]
end

views/topics/index.html.erb

...
<% @key = params[:community_id] + "_topic_index_"  + params[:page] %>
    <% cache(:controller => "topics", :action => "index", :action_suffix => @key) do %>
        <%= page_entries_info(@communities, :entry_name => 'community').html_safe %>
        <%= paginate @communities, :window => 4 %>
        <% @communities.each do |community| %>  
            <%= render 'communities/community', :community => community %>
        <% end %>
    <% end %>
<% end %>
...

视图/主题/显示.html.erb

...    
<% @key = params[:community_name] + "_topic_show_" + params[:id] + "_comments" + params[:page] %>
    <% cache(:controller => "topics", :action => "show", :action_suffix => @key) do %>
         <%= paginate @comments, :window => 4 %>
         <%= page_entries_info(@comments, :entry_name => 'comment').html_safe %>
         <h2>Comment</h2>
         <div class="CommentInformation">
         <% @comments.each do |comment| %>
             <%= render 'topics/comment', :comment => comment %>
         <% end %>
    </div>
<% end %>
...

模型/topic_sweeper.rb

class TopicSweeper < ActionController::Caching::Sweeper
  observe Topic

  def after_save(record)
    expire_fragment(url_for(:action => 'index', :only_path => true) + '?????(all the caches related to the topic#index)')
    expire_fragment(url_for(:action => 'show', :only_path => true) + '?????(the cache related to the particular topic#show)')
  end
end

-------------------------------------评论----------------------------------------

模型/comment_sweeper.rb

class CommentSweeper < ActionController::Caching::Sweeper
  observe Comment

  def after_save(record)
    expire_fragment(url_for(:action => 'index', :only_path => true) + '?????(all the caches related to the topic#index)')
    expire_fragment(url_for(:action => 'show', :only_path => true) + '?????(the cache related to the particular topic#show)')
  end
end

我正在继续我的回答

我应该如何为具有大量内容更新的动态页面设置 dalli？

请注意，我

不是专家，但我确实尝试了您的方法并放弃了它，因为随着我的应用程序的增长，它变得越来越复杂，我选择了上一个问题中提到的基于缓存键片段的方法。有几件事要记住。

方法要求您在对应用程序进行更改时确保清理程序是最新的，这意味着额外的维护和测试工作。
在动态应用程序中，您可能无法轻松缓存整个页面，尤其是在视图显示来自许多模型的信息时。
除非页面参数成为缓存键的一部分，否则您将无法处理分页问题。
当您的缓存已满时，memcached 会在放入新的缓存片段时简单地删除最少使用/最旧的缓存项。
因此，当您的模型发生变化时，您只需推送新的缓存片段并让 memcached 清除旧的过时缓存项，都没有问题。

因此，视图中的片段缓存可能是最简单的解决方案，因为它将处理分页，而您不必处理手动缓存失效

所以看看你的一个观点，我可能会做的是

<% if params[:sort] %>
        <%= page_entries_info(@communities, :entry_name => 'community').html_safe %>
        <%= paginate @communities, :window => 4 %>
        <% @communities.each do |community| %>  
            <% cache(community, :suffix => "community_index") do 
                <%= render 'communities/community', :community => community %>
            <% end %>
        <% end %>
<% end %>

我所做的是缓存每个社区记录的渲染，分页变得无关

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Ruby on rails - 如何在使用分页(kaminari)时使用dalli实现片段缓存

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