Spring Data Rest - sort by nested property

The workaround I found is to create an extra read-only property for sorting purposes only. Building on the example above:

@Entity(name = "Person")
@Table(name = "PERSON")
public class Person {

    // read only, for sorting purposes only
    // @JsonIgnore // we can hide it from the clients, if needed
    @RestResource(exported=false) // read only so we can map 2 fields to the same database column
    @ManyToOne
    @JoinColumn(name = "address_id", insertable = false, updatable = false) 
    private Address address;

    // We still want the linkable association created to work as before so we manually override the relation and path
    @RestResource(exported=true, rel="address", path="address")
    @ManyToOne
    private Address addressLink;

    ...
}

The drawback for the proposed workaround is that we now have to explicitly duplicate all the properties for which we want to support nested sorting.

LATER EDIT: another drawback is that we cannot hide the embedded property from the clients. In my original answer, I was suggesting we can add @JsonIgnore, but apparently that breaks the sort.

I debugged through that and it looks like the issue that Alan mentioned.

I found workaround that could help:

Create own controller, inject your repo and optionally projection factory (if you need projections). Implement get method to delegate call to your repository

 @RestController
 @RequestMapping("/people")
 public class PeopleController {

    @Autowired
    PersonRepository repository;

    //@Autowired
    //PagedResourcesAssembler<MyDTO> resourceAssembler;

    @GetMapping("/by-address/{addressId}")
    public Page<Person> getByAddress(@PathVariable("addressId") Long addressId, Pageable page)  {

        // spring doesn't spoil your sort here ... 
        Page<Person> page = repository.findByAddress_Id(addressId, page)

        // optionally, apply projection
        //  to return DTO/specifically loaded Entity objects ...
        //  return type would be then PagedResources<Resource<MyDTO>>
        // return resourceAssembler.toResource(page.map(...))

        return page;
    }

}

This works for me with 2.6.8.RELEASE; the issue seems to be in all versions.