saving buyer function

var newUser = new Buyer();
            newUser.facebook = profile.id;
            newUser.username = profile.displayName;
            newUser.email = profile._json.email;
            newUser.password = profile._json.password;
            newUser.profileimage = "default.png";
            newUser.token.push({token: token});
            newUser.save(function (err) {
                if (err) {
                    return done(err);
                }
                return done(null, newUser);
            });