require_dependency 'distributed_cache' class Developer < ActiveRecord::Base belongs_to :user after_save :rebuild_cache after_destroy :rebuild_cache @id_cache = DistributedCache.new('developer_ids') def self.user_ids @id_cache["ids"] || rebuild_cache end def self.rebuild_cache @id_cache["ids"] = Set.new(Developer.pluck(:user_id)) end def rebuild_cache Developer.rebuild_cache end end # == Schema Information # # Table name: developers # # id :integer not null, primary key # user_id :integer not null #