如果iOS用户正在主动向视图添加数据，那么从服务器检索此数据的最佳方法是什么？

I've created a quick application that lists Hotels and Rooms. I've created a backend with Rails and postgresql, and I've got it up on heroku. I'm using JSON to pass information back and forth betwene my iOS front end.I've created a quick application that lists Hot