event_news/app/models/event_news_feed_cache.rb

class EventNewsFeedCache
	include Mongoid::Document
	include Mongoid::Timestamps

	field :content, type: String, default: ''
	field :uid
	field :start
	field :end
	field :date
	field :invalid_date, type: DateTime
	def self.regenerate_all
		caches = self.all.to_a
		time_now = Time.now
		caches.each do |cache|
			if cache.invalid_date && cache.invalid_date <= time_now
				cache.destroy
			else
				cache.regenerate
			end
		end
		uids = EventNewsFeed.all.pluck(:uid) - caches.collect(&:uid)
		EventNewsFeed.where(:uid.in=> uids).each do |feed|
			feed.generate_one_cache()
		end
	end
	def regenerate
		st = self.start
		et = self.end
		dt = self.date
		uid = self.uid
		EventNewsFeed.where(uid: uid).each{|v| v.generate_one_cache(startdt: st,enddt: et,dt: dt)} rescue nil
		self.destroy
	end
end