node-example

user.js

var userSchema = new Schema(
    fb_id       : String,
    firstName   : String,
    lastName    : String,
    messages    : [{
      content     : String,
      positive    : Boolean,
      author      : User,
      created_at  : {type : Date, default : Date.now},
      updated_at  : {type : Date, default : Date.now}
    }],
    created_at  : {type : Date, default : Date.now},
    updated_at  : {type : Date, default : Date.now}
  );

var User = new Model('User', userSchema);

module.exports = User;