example.js

import action from "./controller";

router.get("/:user/status/", authenticate, function(request, response) {
  const user = request.params.user;
  action(user)
    .then(value => response.json(value))
    .catch(reason => response.json({ data: reason, status: 500 }));
});

function authenticate(request, response, next) {
  next();
}


// controller.js
import model from "./model";

const controller = {
  action(user, status) {
    return model
      .setStatus({ user, status })
      .then(model.recalculate)
      .then(model.transmogrify);
  }
};

export controller;


// model.js
import db from "./database";

function setStatus(data) {
  return db.update({ id: data.user, info: { status: data.status } });
}

function recalculate(user) {
  user.iteration += 1;
  return user.save();
}

function transmogrify(user) {
  db
    .get(user - 1)
    .then(function(previousUser) {
      return user.compare(user, previousUser);
    })
    .then(function(result) {
      if (result.winner === user.id) {
        return user.save({ victories: user.victories += 1 });
      }
      return { victories: false };
    });
}

export { setStatus, recalculate, transmogrify };