How to set relation foreign key to be required

Question

I have two models. Company and Booking.
In the relation part of model Company

"bookings": {
  "type": "hasMany",
  "model": "Booking",
  "foreignKey": "companyId"
}

The issue is, it is possible to post a Booking without companyId which is not ok.
From the explorer.

Booking {
  bookingId (string, optional),
  name (string),
  location (string),
  companyId (string, optional)
}

Answer 1

You actually can't enforce this particular validation out-of-the-box. Instead you have a couple different options:

a) You can enforce the creation of Booking through company through the endpoint, POST /api/Company/{id}/Bookings by disabling Booking.disableRemoteMethod('create', ...) along with any other methods that have the ability to create records from the Booking model.

b) You can add a remote hook to check whether or not the company record exists and throw an error accordingly.

Booking.beforeRemote('create', function(ctx, booking, next) {
  var Company = Booking.app.models.Company;
  var companyId = ctx.req.body.companyId;

  if (companyId) {
    errorMsg = 'Company with id=' + companyId + ' does not exist.';
    var noCompany = new Error(errorMsg);
    Company.findById(companyId, function(err, company) {
      if (err) next(err);
      if (!company) {
        ctx.res.statusCode = 400;
        next(noCompany);
      } else {
        next();
      }
    });
  } else {
    next();
  }
});

You will also have to do the same thing for any other endpoints that allow record create such as PUT /api/Bookings.

Hope that helps!