controller-example.js

module.exports = function () {
  return function (req, res) {
    var pageNum = req.params.pageNum |0;
    var querySet = {};
        querySet['pages.'+pageNum] = false;
    Project
      .update({_id: req.params.projectID, owner: req.user._id}, {$set: querySet})
      .exec(function (err, updated) {
        err
          ? res.json(500, {error: err.message})
          : updated
            ? Project
                .update({_id: req.params.projectID, owner: req.user._id}, {$pull: {pages: false}})
                .exec(function (err) {
                  err
                    ? res.json(500, {error: err.message})
                    : res.json(200, {});
                })
            : res.json(404, {});
      });
  };
};