Backbone集合未使用REST响应模型更新？

I have an backbone app, back-end is Node/Express.js with a REST API. The application allows users to create new entries, and used to have only client side validation to cleanse and update certain fields. However, entries could be created via the REST API (not client) and I wanted a consistent and easy to maintain validation procedure, I moved the validation to the server. It was at this point that I realized my backbone implementation was not working as I understood it would.I have an backbone app, back-end is Node/Expres