Rails cache by memory_store with 1-day expiration

Rails cache has no expiration by default.
So I save the time cached in the cache itself.

	class ApplicationController < ActionController::Base
	helper_method :count_something
	def count_something
	cache_of_today "count-of-something" do
	Something.count
	end
	end
	def cache_of_today(key, &block)
	cached = Rails.cache.read key
	if !cached || cached[:created_at] < 1.day.ago
	Rails.cache.write key, :created_at => Time.now, :value => block.call
	cached = Rails.cache.read key
	end
	cached[:value]
	end
	end

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