How to delete object in Apache-Cayenne? - orm

Question

My back-end application gets json object via REST API, which exists in database but not exist in Caeynne ObjectContext, how to remove object by id via ObjectContext.
// <dependency>
// <groupId>org.apache.cayenne</groupId>
// <artifactId>cayenne-server</artifactId>
// <version>4.0.M5</version>
// </dependency>
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.configuration.server.ServerRuntime;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.cayenne.test.model.Artist;
#RestController
#RequestMapping(value = "/rest")
public class ArtistRestController {
#DeleteMapping(value = "/artist")
public ResponseEntity deleteArtist(#RequestBody Artist artist) {
ServerRuntime runtime = ServerRuntime
.builder()
.addConfig("cayenne-cayenne_test.xml")
.build();
ObjectContext context = runtime.newContext();
// don't work
context.deleteObject(artist);
context.commitChanges();
return new ResponseEntity<>(HttpStatus.OK);
}
}

Answer 1

If you object have all it's properties and ObjectId properly set you can do something like this:
context.localObject(myObject);
context.deleteObject(myObject);
context.commitChanges();
If you have only raw id you should create object first:
MyObject myObject = Cayenne.objectForPk(context, MyObject.class, id);
context.deleteObject(myObject);
context.commitChanges();
In this case you object probably will be fetched from the database, to restore actual state of it and to track all relationships that can be deleted along with this object.