active_admin resource/index.html.arb缓慢

Question

使用active_admin,我看到加载具有许多记录的模型的索引的速度很慢.我不确定这与其他报道的缓慢病例有关.

2011-11-10 13:26:14 rails[35848]  INFO: Started GET "/admin/articles" for 127.0.0.1 at Thu Nov 10 13:26:14 -0800 2011
2011-11-10 13:26:14 rails[35848]  INFO: Processing by Admin::ArticlesController#index as HTML
2011-11-10 13:26:14 rails[35848]  DEBUG: AdminUser Load (0.3ms)  SELECT "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = 1 LIMIT 1
2011-11-10 13:26:14 rails[35848]  DEBUG: Article Load (381.2ms)  SELECT "articles".* FROM "articles" ORDER BY publish_date desc, guid desc, "articles".id desc LIMIT 30 OFFSET 0
2011-11-10 13:26:14 rails[35848]  DEBUG: SQL (0.5ms)  SELECT COUNT(*) FROM "articles"
2011-11-10 13:26:14 rails[35848]  DEBUG: CACHE (0.0ms)  SELECT COUNT(*) FROM "articles"
2011-11-10 13:26:14 rails[35848]  DEBUG: CACHE (0.0ms)  SELECT COUNT(*) FROM "articles"
2011-11-10 13:26:21 rails[35848]  DEBUG: PendingArticle Load (6602.8ms)  SELECT "pending_articles".* FROM "pending_articles" ORDER BY created_at desc
2011-11-10 13:26:41 rails[35848]  DEBUG: Domain Load (1.0ms)  SELECT "domains".* FROM "domains"
2011-11-10 13:26:41 rails[35848]  INFO: Rendered /Users/sorens/.rvm/gems/ruby-1.8.7-p299@rails3/gems/activeadmin-0.3.4/app/views/active_admin/resource/index.html.arb (27605.5ms)
2011-11-10 13:26:41 rails[35848]  INFO: Completed 200 OK in 27645ms (Views: 20629.0ms | ActiveRecord: 6985.8ms)

这是一个请求/admin/articles.我的文章模型有一个belongs_to :pending_article.pending_article有has_one :article, :autosave => true.

我有几个问题

(1)我可以阻止这个额外的查询吗？我没有从文章的索引视图访问任何pending_article中的任何字段.似乎文章查询是通过分页正确确定范围的,但对pending_article的后续查询似乎抓住了它们.

(2)index.html.arb如果只显示30条记录,为什么渲染需要27秒以上？

我使用的是Ruby 1.8.7-p299,Rails 3.0.5和active_admin 0.3.4.上面的输出来自我的开发环境(在Heroku上需要更长的时间).在上面的例子中,我有10,708篇文章和17,648个pending_articles.

Answer 1

默认情况下,表单包含每个属性的过滤器,这意味着它正在尝试为所有待处理文章创建一个漂亮的弹出窗口.而不是仅使用默认值,尝试使用以下内容定义过滤器列表:

ActiveAdmin.register Article do
  filter :title
end

并且一定要跳过pending_articles.这应该可以防止它加载所有这些记录.