index.js

var mongoose = require("mongoose"),
    db = mongoose.connect("mongodb://localhost"),
    Schema = mongoose.Schema,
    _ = require("lodash")
;

var UserSchema = new Schema({
    provider: String,
    name: String,
    email: String,
    hashedPassword: String,
    salt: String,
    drafts: ["Skim"],
    starredSkims: ["Skim"],
    skimsCreated: ["Skim"],
    role: String,
});
mongoose.model("User", UserSchema);
var User = mongoose.model("User");

var SkimSchema = new Schema({
    skim: String,
});

var user = new User({
    provider: "local",
    name: "Adam",
    email: "[email protected]",
    hashedPassword: "foo",
    salt: "bar",
    drafts: [],
    starredSkims: [],
    skimsCreated: [],
    role: "user",
});

user.save(function (err, user) {
    User.findById(user._id, function (err, user) {
        var updated = _.extend(user, {});
        updated.increment();
        user.save(function (err) {
            console.log(err);
        });
    });
});