我有这样的路线: Rails.application.routes.draw do
root 'login#new'
get '/home/inicio', to: 'home#index'
scope '/login' do
get '/acesso', to:'login#new'
post '/acessorecebendo', to:'
如何创建一个ActiveRecord查询以下SQL查询 SELECT device1.*
FROM devices device1
WHERE device1.id = (SELECT MAX(device2.id)
FROM devices device2
WHERE device2.user_id = device1.user_id);
我Device模
我有具有用于存储用户的部份资料图片一上传carrierwave class User < ActiveRecord::Base
mount_uploader :profilepic, LogoUploaderUploader
我想缓存在此redis的用户对象的用户模型的ActiveRecord模型对象。虽然我缓存调用的activerecord对象上to_json方法其中profile