o

o.js

function ensure(notOkCode, notOkMessage, response, okFx) {
  return function(err) {
     if (err) {
       response.status(notOkCode).json({"message": notOkMessage});
     }
     else {
       okFx.apply(okFx, Array.prototype.slice.call(arguments, 1));
     }
  };
}

var ensureFound = _.partial(ensure, 404, "Not Found"),
    ensureValid = _.partial(ensure, 400, "Bad Request");

expressRouter.get("/api/ledgers/:id", function(req, res) {
  UserService.getLedgerById(req.params.id, ensureFound(ledger) {
    res.status(200).json(ledger);
  });
});

expressRouter.patch("/api/users/:id", function(req, res) {
  UserService.getUserById(req.params.id, ensureFound(res, function(user) {
    UserService.updateUser(user, req.body, ensureValid(res, function(updated) {
      res.status(200).json(updated);
    });
  });
});