api.js

const updateNightclub = (req, res, next) => {
  const nightclubId = req.params.id;
  const {value} = req.body;
  console.log(nightclubId, value);

  Nightclubs.methods.updateVisitors.call({nightclubId, value}, (err, result) => {
    const response = {
      code: 200
    };

    if (err) {
      console.log(err)
      return JsonRoutes.sendResult(res, {
        data: {message: "There was an error"},
        code: 500
      });
    }

    if (result === 1) {
      response.data = {
        message: "Success",
        nightclub: Nightclubs.findOne(nightclubId),
        value: 1
      };
    } else if (result === -1) {
      response.data = {
        message: "Success",
        nightclub: Nightclubs.findOne(nightclubId),
        value: -1
      };
    } else {
      response.code = 404;
      response.data = {
        message: "Did not find a nightclub with that ID",
        nightclubId: nightclubId,
        value: 0
      };
    }

    console.log(response);
    JsonRoutes.sendResult(res, response);
  });
};

JsonRoutes.add('put', 'nightclubs/:id', updateNightclub);

methods.js

Nightclubs.methods.updateVisitors = new ValidatedMethod(/* ... */);