In order to save a Spring Data Rest object with a foreign key to another object I can use a following JSON
{
"studentName":"newObj",
"department":"departments/2"
}
where department is a HAL link.
I wish to do some processing before the student is saved, without changing the default Spring Data Rest API.
How can I define a Spring controller endpoint so that it parses the resource link automatically and initializes the student object with the according department object?
Either write an ApplicationListener
public class BeforeSaveEventListener extends AbstractRepositoryEventListener {
@Override
public void onBeforeSave(Object entity) {
... logic to handle inspecting the entity before the Repository saves it
}
@Override
public void onAfterDelete(Object entity) {
... send a message that this entity has been deleted
}
}
or write an Annotated Handler
@RepositoryEventHandler
public class PersonEventHandler {
@HandleBeforeSave
public void handlePersonSave(Person p) {
// … you can now deal with Person in a type-safe way
}
@HandleBeforeSave
public void handleProfileSave(Profile p) {
// … you can now deal with Profile in a type-safe way
}
}
https://docs.spring.io/spring-data/rest/docs/current/reference/html/#events
