Correctly serialize rel links to appropriate concrete implementation [DATAREST-358]

Benjamin Conlan opened DATAREST-358 and commented

When using an abstract entity type relation the Jackson serializer fails to build the correct concrete type (Can not construct instance of abstract entity) when enough information is provided to do so:

(I've attached an examplar source which is based upon the spring-boot data-rest sample)

In brief the entity hierarchy is as such:

• Accommodation (abstract)
  • Hotel
  • BedAndBreakfast

And the associating entity is a 'Reservation' which contains
{code:title:Reservation.java (partial)}
@NotNull
@ManyToOne
private Accommodation accommodation;

So when creating a reservation I would expect the Rest controller to resolve the concrete type of the Accommodation via the ref such as when performing

curl -X POST -H "Content-Type: application/json" http://localhost:8080/reservations -d '{"accommodation":"bedAndBreakfast/1", "price":99}'

And marshal an instance of 'BedAndBreakfast' but instead attempts to marshal the abstract type 'Accommodation'

Affects: 2.1 GA (Dijkstra)

Attachments:

• abstract-serialise-rest.zip (9.53 kB)