Question

You want to make sure that an airline flight in your app cannot be deleted if there are still passengers assigned to it. What should you configure?

0

confused what is deleted here?

asked 2022-04-15

DurgaDileepKumar Manthina

4 answers

Maarten Abbassi · Answer 1 · 2022-04-15

Hi there!

In other words: an airline flight, for example from Amsterdam to Paris, can only be deleted by a user if there are no passengers assigned to that flight. In other other words, if a plane flies from New Delhi to Mumbai, it should only be deleted (cancelled) if no passengers will fly on the plane.

Hope this helps!

Maarten

Tim v Steenbergen · Answer 2 · 2022-04-15

Depending on your domain model, if you have an entity for Flight and have it associated with an entity Passenger, then you can set the delete-behavior of that association to only allow a flight to be deleted if no passenger is associated with it.

Aykut Yakup Gultekin · Answer 3 · 2022-04-15

You can double click the association and you can configure on delete options, I think.

Necdet Ozdemir · Answer 4 · 2022-04-15

You should set a validation to delete action (or change it if already exixts) like this : not(flight_passenger/passenger). This means that there is no object (passenger) that hangt the association between flight and passenger.