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

view raw cache_of_today.rb hosted with ❤ by GitHub

Sync crontab and Rails with Capistrano

1. Put `crontab -l` into a file and add it into your repository
2. Add lines below to your config/deploy.rb

	after 'deploy' do
	run "crontab -r && crontab #{File.join(current_path, 'cron')}"
	end

view raw deploy_crontab.rb hosted with ❤ by GitHub

that's all. crontab on production server will be refreshed after every deployment.

新しいの5個だけ残してあとは消す

Rubyで書こうとしましたが、間違いでした。
Unixすばらしい。

ls -t1|awk '{if(/f/ && nlines++ >= 5) print $1;}'|xargs rm

view raw leave_newer_five.sh hosted with ❤ by GitHub