Validate a Mongoose model and then upsert if valid (the other way)

validate-and-upsert-2.js

mySchema.statics.upsert = function (conditions, update, callback) {
    this.findOne(conditions, function (err, existingDoc) {
        if (err) {
            callback(err);
        } else if (existingDoc) {
            // I don't think this is valid
            existingDoc.update(update);
            existingDoc.save(callback);
        } else {
            return this.create(update, callback);
        }
    });
};