Memcache的Fragment_exist找不到缓存的信息 [英] Fragment_exist for Memcache does not find cached info

问题描述

我在Heroku上使用Rails，Dalli gem，friendly_id和Memcachier.

I am using Rails, Dalli gem, friendly_id and Memcachier on Heroku.

我的问题类似于我以前遇到的问题但是在我开始使用Memcache而不是默认的Rails缓存后，该操作停止了.应该注意的是，我对Rails缓存不是很熟悉，很可能我做错了很多事情(或者没有考虑简单的事情).

My problem is similar to an issue I have had previously but that stopped working after I started using Memcache instead of the default Rails cache. It should be noted that I am not very familiar with Rails caching and it is quite likely that I do many things wrong (or fail to consider simple things).

production.rb

  config.action_controller.perform_caching = true
  config.cache_store = :dalli_store, 'mc2.ec2.memcachier.com:11211', { :namespace => 'my_app_name', :expires_in => 40.days, :compress => true, :username => 'asdf', :password => 'asdf' }

礼物#显示-控制器

unless fragment_exist?("gift-show--" + @gift.slug)
  # Perform slow database fetches etc
end

礼物#显示-查看

<% cache('gift-show--' + @gift.slug) do %>
 # Create HTML with lots of images and such
<% end %>

在我开始在Heroku上使用Memcachier之前，此方法运行良好.我的猜测是fragment_exist?不会签入Memcachier，而是签入默认Rails缓存"(如果有区别).我尝试使用Rails.cache.exist?("gift-show--" + @gift.slug)代替fragment_exist?，但是它不起作用.

This worked fine before I started using Memcachier on Heroku. My guess is that fragment_exist? does not check in Memcachier but rather in "default Rails cache" (if there is a difference). I have tried to use Rails.cache.exist?("gift-show--" + @gift.slug) instead of fragment_exist? but it doesn't work.

我已经多次加载特定的礼物#show-view，以确保将其缓存.在日志中，我还可以看到Read fragment views/gift-show--cash-stash (1.3ms)(在控制器之后)，我相信这是一个片段实际存在的证明.只是在不需要时，它正在经历缓慢的(4秒)gift#show-controller.

I have loaded the particular gift#show-view a few times to make sure it is cached. In the logs I can also see Read fragment views/gift-show--cash-stash (1.3ms) (after the controller) which I believe is a proof for that a fragment actually exist. It is just that it is going through the slow (4 seconds) gift#show-controller when it is not necessary.

如果我在Heroku上进入控制台并键入"Rails.cache.read('gift-show--cash-stash')"，则会收到零响应.

If I enter the console on Heroku and type "Rails.cache.read('gift-show--cash-stash')" I get a nil response.

另一件事是，如果在控制台中执行以下操作:

Another peculiar things is that if do the following in the console:

irb(main):014:0> Rails.cache.write("foo", "bar")
=> true
irb(main):015:0> Rails.cache.read("foo")
=> nil

这很奇怪，不是吗?

那么，我应该用什么代替fragment_exist?为了使这项工作?

So, what should I use, instead of fragment_exist? in order to make this work?

推荐答案

我不是100％确定这是解决方案，但我添加了"memcachier" gem (我没有)并将我的production.rb更改为:

I am not 100% sure this is the solution but I added the 'memcachier' gem (which I didn't have) and altered my production.rb to:

  config.cache_store = :dalli_store

这实际上还解决了另一个完全不同的问题，我的大惊喜！

This actually also solved another, completely different issue, to my great surprise!

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