Manually expire low level cache

Question

I'm using the following low-level caching for the five most recent news articles in my Rails application:

@recent_news = Rails.cache.fetch("recent_news", :expires_in => 1.hour) do
  News.order("created_at desc").limit(5)
end

Is there a way to keep this query cached until a new news article is created? I was thinking of manually expiring the cache using an observer, but wasn't sure if there was a way to actually do this, e.g:

class NewsObserver < ActiveRecord::Observer
  def after_create
    #expire recent_news cache
  end
end

Answer 1

You can manually expire the cache using the .delete method:

Rails.cache.delete("recent_news")