使Rails缓存中的特定模型无效 [英] Invalidate a specific model in the Rails cache

问题描述

我正在使用带有Memcached的Rails 3来缓存某些模型。当模型更改时，我想使该记录的缓存无效。对于视图片段，我只说 expire_fragment（ blah）。如何使用我的模型执行此操作？我不想说 Rails.cache.clear 而全丢了。我想要类似 Rails.cache.invalidate（ / users / 5）之类的东西。我该怎么做？

I'm using Rails 3 with Memcached to cache some models. When the model changes, I want to invalidate the cache for that record. With view fragments, I just say expire_fragment("blah"). How do I do this with my models? I don't want to say Rails.cache.clear and lose the whole thing. I want something like Rails.cache.invalidate("/users/5"). How do I do that?

推荐答案

您没有提到在什么时候实际将模型添加到缓存中。您可以尝试使用 after_save 挂钩使模型缓存无效。

You did not mention at what point the model is actually added to the cache. You could try invalidating the model cache using the after_save hook.

class Model < AR::Base

  after_save :invalidate_cache

  private
  def invalidate_cache
     Rails.cache.delete("/users/#{self.id}")
     return true # recommended to return true, as Rails.cache.delete will return false if no cache is found and break the callback chain. 
  end
end

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