我有一个观点正在遍历一系列帖子，并且正在统计每个帖子的投票数。我知道如何进行预先加载以及如何使用缓存计数器。但是我不知道如何使用acts_as_votable 附带的缓存计数器(或者我做错了什么。)
看法:
<span class="votes">
<% if current_user.voted_for? link %>
<%= link_to like_link_path(link), class: "likes active", id: "link-#{link.id}", remote: true, method: :put do %>
<i class="fa fa-heart"></i> <%= link.cached_votes_total.to_s %>
<% end %>
<% else %>
<%= link_to like_link_path(link), class: "likes", id: "link-#{link.id}", remote: true, method: :put do %>
<i class="fa fa-heart-o"></i> <%= link.cached_votes_total.to_s %>
<% end %>
<% end %>
</span>
终端:
Link Load (0.4ms) SELECT "links".* FROM "links" ORDER BY "links"."score" DESC LIMIT 10 OFFSET 0
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" IN (1)
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
(0.2ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."voter_id" = $1 AND "votes"."voter_type" = $2 AND "votes"."votable_id" = $3 AND "votes"."votable_type" = $4 AND "votes"."vote_scope" IS NULL [["voter_id", 1], ["voter_type", "User"], ["votable_id", 1], ["votable_type", "Link"]]
(0.2ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."voter_id" = $1 AND "votes"."voter_type" = $2 AND "votes"."votable_id" = $3 AND "votes"."votable_type" = $4 AND "votes"."vote_scope" IS NULL [["voter_id", 1], ["voter_type", "User"], ["votable_id", 2], ["votable_type", "Link"]]
Rendered home/index.html.erb within layouts/application (24.6ms)
Completed 200 OK in 60ms (Views: 56.9ms | ActiveRecord: 1.6ms)
谢谢!
最佳答案
对我来说，这看起来没什么异常。 voted_for?方法是 voted_on? 的别名.继续阅读代码你会发现这个方法调用了一个 votes.size > 0 ，这将触发对数据库的以下查询。 (我猜你的页面上有 2 个链接，对吧？)所以它与缓存的计数字段无关。
(0.2ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."voter_id" = $1 AND "votes"."voter_type" = $2 AND "votes"."votable_id" = $3 AND "votes"."votable_type" = $4 AND "votes"."vote_scope" IS NULL [["voter_id", 1], ["voter_type", "User"], ["votable_id", 1], ["votable_type", "Link"]]
(0.2ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."voter_id" = $1 AND "votes"."voter_type" = $2 AND "votes"."votable_id" = $3 AND "votes"."votable_type" = $4 AND "votes"."vote_scope" IS NULL [["voter_id", 1], ["voter_type", "User"], ["votable_id", 2], ["votable_type", "Link"]]
附言代码在这里:github: voter.rb .
关于ruby-on-rails - 使用acts_as_votable 的缓存计数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31463769/