title: How do you handle form validation, especially with nested models, in Node.js + Express + Mongoose + Jade
body: <p>How are you handling form validation with Express and Mongoose? Are you using custom methods, some plugin, or the default errors array? </p>
  
  <p>While I could possibly see using the default errors array for some very simple validation, that approach seems to blow up in the scenario of having nested models.</p>