Example-1-(Refactoring).js

/*
   Update user video settings
   POST /user_settings/video_settings
     body: {
       enableDisclaimer: boolean,
       enableWatermark: boolean
     }
 */
  updateVideoSettings: function (req, res) {
    const updateObj = {};

    if(!_.isUndefined(req.param('enableDisclaimer'))) updateObj.enableDisclaimer = req.param('enableDisclaimer');
    if(!_.isUndefined(req.param('enableWatermark'))) updateObj.enableWatermark = req.param('enableWatermark');

    return User.update(req.session.User.id, updateObj)
      .then(users => {
        if (!users || !users.length) {
          return res.json(404, { status: 'failed', error: 'User not found' });
        }

        var user = _.pick(users[0], ['id', 'name', 'email', 'enableDisclaimer', 'enableWatermark']);

        req.session.User.enableDisclaimer = user.enableDisclaimer;
        req.session.User.enableWatermark = user.enableWatermark;

        return res.json({ status: 'SUCCESS', settings: user });
      })
      .catch(error => res.status(500).send({ status: 'failed', error }));
  },